[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

Kassa, B.; Leta Tesfaye, J.; Bulcha, B.; Kiran, R.; Deepak, T.; Lal, Dayanand; Venkatesh, S.; Krishnaraj, R.

doi:https://doi.org/10.1155/2021/6253069

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Volume 2021 | Article ID 6253069 | https://doi.org/10.1155/2021/6253069

[Retracted] Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses

B. Kassa,¹J. Leta Tesfaye,^1,2B. Bulcha,¹R. Kiran,³T. Deepak,⁴Dayanand Lal,⁵S. Venkatesh,⁶and R. Krishnaraj^2,7

Academic Editor: Samson Jerold Samuel Chelladurai

Received18 May 2021

Revised07 Jun 2021

Accepted22 Jun 2021

Published29 Jun 2021

Abstract

The melt-quenching technique was used to produce 39CdO–10Al₂O₃-(51-x) P₂O₅: xMnO glasses (x = 0, 0.1, 0.2, 0.3, and 0.4 wt.%). Various stability factors were calculated and presented from DTA analysis. The stability of the glass network appears to increase with the increase of MnO concentration, according to the findings. IR spectral analysis of these glasses exhibited several symmetrical and asymmetrical bands due to phosphate groups. The observed change in these band intensities with the rise in MnO concentrations, ranging from 0.1 wt.% to 0.4 wt.%, shows an increase in the stability of the glass network. Optical absorption analyses of these glasses revealed an absorption band that shifted from 500 to 488 nm as the concentration of manganese oxide (MnO) increased from 0.1 wt.% to 0.4 wt.%, indicating that Mn²⁺ ions were gradually converted into Mn³⁺ ions. EPR spectra of these glasses were characterized by two signals due to Mn²⁺ and Mn³⁺ ions. Observations on these signal intensity variations revealed an increase in stability of the glass network with the increase of MnO concentration from 0.1 wt.% to 0.4 wt.%. Parameters, which describe the insulating characteristics, for example, dielectric constant, ε, dielectric loss, tan δ, and AC conductivity σ_ac, were determined in relation to frequency (10³ Hz to 10⁵ Hz) and temperature (20°C to 400°C) and presented in the dielectric analysis of these glasses.

1. Introduction

The dielectric constant, loss tan, and AC conductivity, as well as the dielectric breakdown strength of the glasses, are used to determine their insulating character and understand the structural features over such a wide frequency and temperature range [1]. In recent years, a number of studies have investigated a number of inorganic glasses under this way, resulting in useful information [1–3].

Phosphate glasses may be used for a variety of uses, including bone transplantation, hazardous waste containment, high electron conductors, laser host components, low-temperature seals, metallic seal materials, bioglasses, diametric purposes, and solid state electrolytes, among others [4–7]. They have significant physical properties, such as a low melting temperature, high heat transfer coefficient, high ultraviolet transmission, lower glass transition temperature, minimum softening temperature, high ionic conductivity, and biocompatibility [8]. Addition of Al₂O₃ to phosphate glasses improves their chemical durability and modifies their physical properties for more commercial applications [9, 10].

Transition metals-doped glasses have interesting optical, luminescent, semiconducting, memorizing, and photoconducting properties [11, 12]. Manganese ion is an intriguing transition metal ion although it can be present in a number between valence states (Mn³⁺ and Mn²⁺) of different glass matrices [13]. The quantitative characteristics of modifiers and glass formers, size of both ions in the glass structure, field strength, and mobility of the modifier cation, among some other factors, determine the amount of manganese contained in the glass in different forms and valence states [14]. Mn²⁺ has an electronic configuration of 3d5, which corresponds to a half-filled d shell. The impact of manganese on the thermal, physical, structural, and optical properties of glasses has been the subject of numerous studies [15, 16]. Moreover, manganese ions are well known to have a significant impact on the electric, magnetic, and optical properties of glasses; there seem to be numerous important studies on manganese ions’ environment in different inorganic glass systems available [17].

The main objective of this paper is to integrate manganese ions and their impact on structural integrity (namely, different band positions ranges between 487 and 1215 cm⁻¹; optical band gap energy) and insulating character of CdO-Al₂O₃-P₂O₅: MnO glasses through a thorough investigation of dielectric constant ε^l, loss tan δ, and AC conductivity σ_ac within the spectrum of frequency 10³ Hz to 10⁵ Hz as well as within the temperature range 20–400°C.

2. Experimental Works

Glasses with compositions 39CdO-10Al₂O₃-(51-x) P₂O₅: xMnO (0–0.4 mol %) were made using the traditional melt quenching techniques, and the samples were labeled as CAPM_0: 39CdO-10Al₂O₃-51 P₂O₅, CAPM_1: 39CdO-10Al₂O₃-50.9 P₂O₅: 0.1 MnO, CAPM_2: 39CdO-10Al₂O₃-50.8 P₂O₅: 0.2 MnO, CAPM_3: 39CdO-10Al₂O₃-50.7 P₂O₅: 0.3 MnO, and CAPM_4: 39CdO-10Al₂O₃-50.6 P₂O₅: 0.4 MnO, respectively. Subsequently, the glasses were made using a technique called rapid melt quench, by which the amorphous solid is formed during the melt-quenching process through the gradual toughening (i.e., rise in viscosity) of a melt.

In this experiment, the glasses were made using the melt-quenching method. The starting materials CdO, Al₂O₃, P₂O₅, and MnO that were used in the making of the present glass systems were of analar grade (greater than 99.9% purity). After polishing, the final glasses’ measurements were 1.0 cm × 1.0 cm × 2.0 cm. For this dielectric analysis, various parameters, namely, dielectric constant , dielectric loss tan , and AC conductivity , were investigated over a broad temperature spectrum and also as a function of wavelength. All these parameters, which were used in this analysis, were measured using LCR Meter (Hewlett-Packard Model-4263B).

3. Results and Discussion

3.1. Results

From the measured values of density d, average molecular weight , and refractive index n_d of CdO-Al₂O₃-P₂O₅: MnO glasses, various other physical parameters, such as manganese ion concentration N_i, mean manganese ion separation R_i,, polaron radius R_p, molar volume V_M, electron polarizability , reflection loss R, and molar refractivity R_M, were calculated and presented in Table 1.

The dopant ion concentration (N_i) could be obtained from

The calculated values of N_i, the interionic distance and polaron radius of dopant ions can be evaluated by the following equations [17]:

Using the refractive index of the glass, the theoretical dielectric constant (ε) was determined:

The Fresnel formula was used to calculate the reflection loss from the glass surface based on the refractive index:

The following formula was used to calculate the molar refractivity R_M for each glass:

The following formula was used to measure the molar volume of the glass samples:

Using the following formula, the electronic polarizability α_e was determined:

The number of manganese ions per unit volume is given by the symbol N_i.

3.1.1. Differential Thermal Analysis (DTA)

As shown in Figure 1, the glass transition temperature , which is between 492 and 523°C, causes an inflection in the spectra and differential thermal analysis (DTA) traces of pure and MnO-doped CdO-Al₂O₃-P₂O₅, through which glasses were observed at temperatures ranging from 30 to 1000°C. The crystallization temperature T_c at 698°C to 750°C causes a well-defined exothermic effect, which is accompanied by a well-defined endothermic effect, and melting temperature T_m due to the endothermic effect in the range of 945°C to 956°C. Based on the observed values of , T_c, and T_m, various stability factors of glasses, namely, , (T_c − )/, and (T_c − )/T_m and the glass forming capacity parameter, which was developed by Hruby, = (T_c − )/(T_m − T_c), were calculated and are presented in Table 2.

The difference of various stability parameters, /T_m, (T_c − )/, (T_c − )/T_m, and , with MnO concentration is depicted in the inset of Figure 1. These curves display a growing trend in the stability factors in MnO concentrations increasing from 0.1 wt.% to 0.4 wt.%, implying that the glass network becomes more stable as MnO concentration rises.

3.1.2. IR Studies

Figure 2(a) represents the room temperature recordings of pure infrared spectra and manganese oxide-doped CdO-Al₂O₃-P₂O₅ glasses. Different IR bands corresponding to phosphate and aluminate structural groups appear in the glass matrix as the concentration of manganese oxide increases. Table 3 shows the data on different band positions from the IR spectra of these glasses.

(a)

(b)

For this specific network of glasses, the infrared transmission spectra were recorded for glasses as shown in Figure 3, and the conventional bands were caused due to the following:(i)The O-P-O symmetric stretching vibrations in the range of 1198–1214 cm⁻¹ (band 1)(ii)The asymmetrical stretching of PO₄³⁻ groups in the region between 995 cm⁻¹ and 1047 cm⁻¹ (band 2)(iii)The asymmetrical bending vibrations of P-O-P groups in the range of 896–915 cm⁻¹ (band 3)(iv)The vibrations of AlO₄ groups in the region between 700 cm⁻¹ and 750 cm⁻¹

(a)

(b)

The frequency of the band 1 (symmetrical band) changes towards lower frequency as the MnO concentration in the glass matrix increases from 0.1 wt.% to 0.4 wt.%, according to the IR-Spectra. Bands 2 and 3 (symmetrical bands) change towards higher frequency as strength decreases, suggesting a decrease in asymmetric stretching and increase in symmetrical stretching in phosphate units, indicating increased polymerization/stability of the glass network. In the presence of some MnO concentration in the glass network, however, no shift in the band location of AlO4 groups is observed. The difference between symmetrical and asymmetrical band intensities for pure and MnO-doped CdO-Al₂O₃-P₂O₅ glasses is depicted in Figure 2(b).

3.1.3. Optical Absorption Studies

Figure 3(a) shows the optical absorption spectra of various materials CdO-Al₂O₃-P₂O₅: MnO glasses. The spectra of MnO-doped glasses exhibit two absorption bands resulting from Mn²⁺ transition (around 500 nm) and Mn³⁺ transition (around 490 nm) .

There is a change in band positions from 500 to 488 nm as the concentration of MnO rises from 0.1 wt.% to 0.4 wt.%, suggesting the incremental conversion of Mn²⁺ ions into Mn³⁺ ions.

Figure 3(b) presents Urbach plot of CdO-Al₂O₃-P₂O₅: MnO glasses. Data on various band positions from the optical absorption spectra are shown in Table 4.

The optical band gap E_opt can be decided based on Urbach plot (αhν)^1/2 versus hν, which is related bywhere α₀ is a constant that is proportional to the length of the band tailing and E_opt is the optical band gap energy [12].

Finally, MnO concentrations were increased from 0.1 wt.% to 0.4 wt.%.. The observed band positions and measured optical band gaps for these glass series indicate a development in the glass network and an insulating character. A similar trend was also observed from other studies (namely, DTA, IR, and EPR) of CdO-Al₂O₃-P₂O₅: MnO glasses.

3.1.4. EPR Studies

Figure 4 shows the EPR spectra of CdO-Al₂O₃-P₂O₅: at room temperature, MnO glasses were registered. The spectra are characterized by two intense resonance signals; one of them is roughly oriented approximately = 2.01 (signal 1) with a six-line hyperfine structure that is typical of independent Mn²⁺ ions, and the other is focusing at = 4.3 (signal 2), which is a characteristic of isolated Mn³⁺ ions.

(a)

(b)

(c)

(d)

As MnO concentration is increased from 0.1 wt.% to 0.4 wt.%, the strength of signal 2 increases at the expense of signal 1, indicating that Mn²⁺ ions are converted to Mn³⁺ ions. As the MnO concentration is raised from 0.1 wt.% to 0.4 wt.%, there is a transformation of Mn²⁺ ions into Mn³⁺ ions observed in the current glass method, which is an indicative of increased covalent nature over that of ionic.

Furthermore, this suggests that the glass polymerization increases with improved stability with MnO concentrations increasing from 0.1 wt.% to 0.4 wt.% in the glass matrix.

3.1.5. Dielectric Studies

Figures 5(a)–5(c), respectively, show the variations of dielectric loss tan , dielectric constant , and AC conductivity of CdO-Al₂O₃-P₂O₅: MnO glasses with temperature (20°C to 400°C) measured as a function of different frequencies at 1 kHz, 10 kHz, and 100 kHz.

(a)

(b)

(c)

Dielectric constant is observed to increase with temperature (with glass) at any frequency for all glasses; in addition, the value of the dielectric constant decreases as the MnO content rises from 0.1 wt.% to 0.4 wt.%. However, at any given temperature and MnO content in the glass network, it was observed that the dielectric constant reduces as the frequency is increased (Figure 5(a)). A similar trend is observed for dielectric loss tan variations (Figure 5(b)).

The ac conductivity σ_ac of these glasses is calculated using the following at various temperatures:where is the vacuum dielectric constant) for various frequencies.

The graph of log σ_ac against 1/T is depicted in Figure 5(c) for all glasses at different frequencies. of these glasses is found to increase with temperature and frequency; in addition, it is observed that increases with rises in MnO content from 0.1 wt.% to 0.4 wt.% (Figure 3). Similar results were reported for MnO containing various glass matrices [3, 18]. Data on dielectric constant, dielectric loss, and AC conductivity of CdO-Al₂O₃-P₂O₅: MnO glasses at 1 kHz, 10 kHz, and 100 kHz for temperatures 20°C and 400°C are presented in Table 5.

3.2. Discussion

In general, glass properties are determined by its composition and, to a large degree, its structure. Aluminophosphate glasses doped with MnO are a mixture of network formers and modifiers with a complex composition [4, 5, 9, 10, 19]. P₂O₅ is a well-known network former composed of PO₄ structural units, in which one of the four oxygen atoms in the PO₄ tetrahedron is doubly bonded to the phosphorous atom [15]. By bridging oxygen atoms, the PO₄ tetrahedrons are joined together in chains or rings by covalent bonding. Cross bonds between metal cations and two nonbridging oxygen atoms of each PO₄ tetrahedron connect neighboring phosphate chains [14].

It is well known that adding a modifier oxide such as CdO to a P₂O₅ glass matrix causes the conversion of sp₂ planar PO₃ units to more stable sp₃ tetrahedral PO₄ units, as well as the formation of nonbridging oxygen atoms [20]. The bands observed at ∼1200 cm⁻¹ and ∼1040 cm⁻¹ result from symmetrical straining vibration (ν_s(O-P-O)) groups of nonbridging oxygen in phosphate chain and normal vibrational mode of asymmetric straining ( (PO₄³⁻)) group vibrations, respectively [20, 21]. Another band in the vicinity of 895 to 980 cm⁻¹ due to P-O-P bending vibration that corresponds to tendency of asymmetric straining of phosphate group [20] was also observed.

Three conventional phosphate bands were visible in the spectra of these lenses due to (i) O-P-O group symmetric straining vibrations in the range 1198–1214 cm⁻¹ (band 1), (ii) PO₄³⁻ group asymmetrical straining vibrations in the range 995–1047 cm⁻¹ (band 2), and (iii) P-O-P group asymmetrical bending vibrations in the range 896–915 cm⁻¹ (band 3). In addition, a band due to AlO₄ group vibrations with a fixed band position at 726 cm⁻¹ was observed for all glasses. From the IR spectral studies of these glasses, it was observed that as the MnO concentration rises from 0.1 wt.% to 0.4 wt.% in the glass matrix, the frequency of the symmetrical band (band 1) of phosphate units shifts towards a reduction in frequency as its intensity increases, and the asymmetrical bands 2 and 3 migrate towards higher frequencies as their intensities decrease, while they shift towards lower frequencies as their intensities decrease. This suggests a reduction in the degree of asymmetric stretching and increase in symmetrical stretching in phosphate units, MnO concentrations were increased from 0.1wt.% to 0.4 wt.%, and there is also a rise in polymerization or stability in the glass network. However, there is no observed change in the band position of AlO₄ groups at any concentration of MnO in the glass network.

Spectra of optical absorption MnO-doped two distinct absorption bands can be seen in the glasses resulting from Mn²⁺ transition (around 500 nm) and Mn³⁺ transition (around 490 nm) . The band at 500 nm arises from intraconfigurational transitions due to Mn²⁺ ions [14, 22]. These detected bands due to Mn2+ ions were hidden, beyond 0.1 wt.% of MnO concentration. Due to the presence of Mn3+ ions, a new strong absorption spectrum with a limit at around 490 nm has emerged [15, 18, 23, 24]. It was observed that the optical band gap increases as the concentration of manganese oxide (MnO) increases from 0.1 wt.% to 0.4 wt.%, whereas the Urbach energy decreases, which indicates improvement in the insulating character and hence the glass network’s strength.

Electron spin resonance gives information about the condition of valence of TM ions, local environment, and the essence of their interactions [25]. Since many of those Mn²⁺ compounds were octahedral and have a top spin structure with five unpaired electrons, they have a top spin arrangement, and an ESR signal with a value close to the free electron value of 2.0023 is predicted [7, 25]. Signal at ∼2.01 due to Mn²⁺ ions shows an octahedral symmetrical environment with the bond dominantly ionic [15, 25, 26].

In the present study, at room temperature, the EPR spectroscopy of all these glasses was recorded by E11Z Varian X-band () ESR Spectrometer. The spectra are characterized by two intense resonance signals; one of them is centered at approximately = 2.01 (signal 1) with a six-line hyperfine sequence that is typical of independent Mn²⁺ ions, and the other is centered at = 4.3 (signal 2), which is a characteristic of isolated Mn³⁺ ions [26]. The presence of a resonance signal at = 2.01 is because of the existence of the Mn²⁺ ion in an area similar to octahedral symmetry. As MnO concentration is increased from 0.1 wt.% to 0.4 wt.%, the strength of signal 2 increases at the cost of signal 1, which is a sign that Mn²⁺ ions are being converted to Mn³⁺ ions. These samples’ spectra are identical to those recorded for manganese ions doped in a variety of glass systems [15, 18, 27].

Ionic, dipolar, electronic, and space charges all contribute to a material’s dielectric constant. Polarization is determined by the purity and perfection of the lenses [1, 28]. At very low temperatures, the effect of space charge polarizations is negligible, but it is within the low frequency range, and there is a significant difference [28]. The dipolar alignment effects in the glasses can be observed at up to 106 Hz. Retrieving our information, we find that ε is slightly frequency-dependent even at room temperature for pure as well as MnO-doped glasses. This is because of the dielectric constant and loss being influenced by space charge polarization. For temperature changes of around 400°C, for many solids, the reduction within the electronic dielectric constant is found to be less than 3% [29]. The defects in glasses can only increase and . As the temperature rises, space charge polarization becomes more dominant and therefore increases [1, 28, 29]. As this form of polarization decreases with frequency, the change in ε and tan δ at higher frequencies and temperature is lower [30–38].

The values increased by up to 0.5% with the addition of MnO, and , σ_ac, and ε are found to decrease at any temperature and frequency. Modifiers, such as octahedral Mn²⁺ ion, weaken the glass network by creating paths for free ions to migrate through, accumulating space charge and increasing disorder. The space charge polarization increases as the glass network becomes weaker, resulting in a reduction in dielectric parameters (i.e., MnO concentration ranging from 0.1 to 0.4). In MnO-doped glasses, the decrease of these parameters in this concentration range suggests that the Mn³⁺ ions present in these glasses (as demonstrated by measurements of optical absorption) establish cross-linkages, where Al-O-Mn bonds are formed by combining a portion of AlO₃ unit ions with a portion of AlO₃ unit ions. This is also logical because Al³⁺ and the oxidation state of Mn³⁺ ions are nearly identical, and their ionic radii are nearly similar (0.51 Å and 0.66 Å, respectively). As a result of these cross-links, the space charge polarization of glasses with MnO concentrations decreases, resulting in lower dielectric parameter values. As a result of increased concentration of MnO in the lenses, the existence of the tan variation often supports that the bulks of the magnesium oxide in the glasses CAPM_1 and CAPM_2 are in the Mn²⁺ state, which acts as modifiers, and in the glasses CAPM_3 and CAPM_4, they are in the Mn³⁺ state, which act as formers.

4. Conclusion

The conclusions drawn from different physical studies and spectroscopic properties of CdO-Al₂O₃-P₂O₅: MnO glasses are summarized as follows.(i)The increase of MnO content from 0.1 wt.% to 0.4 wt.% improved glass network stability in the temperature range of 30–1000°C, according to DTA traces registered in the temperature range of 30–1000°C.(ii)With the improvement due to MnO content increase from 0.1 wt.% to 0.4 wt.%, the IR spectra measured at room temperature showed a rise in the symmetrical bands’ intensity (band 1) at the expense of asymmetrical bands (bands 2 and 3); the observed trend indicates that the glass network’s stability has improved.(iii)The gradual transformation of Mn²⁺ ions into Mn³⁺ by increasing MnO concentrations from 0.1 wt.% to 0.4 wt.% was observed in EPR spectra measured at room temperature, indicating an enhanced covalent atmosphere of manganese ions as well as an improvement in the consistency of the glass network.(iv)The MnO production was increased from 0.1 wt.% to 0.4 wt.% with an improvement in MnO content percent, and optical absorption spectra showed a shift in the concentration of Mn³⁺ ions at the cost of Mn²⁺ ions, as well as a rise throughout the optical band gap; the observed pattern shows an increase in insulating character and thereby the stability of the glass network.(v)At 105 Hz, the dielectric constant of glass M₀ (pure glass) is determined to be 7.36 at room temperature and it was frequency-oriented, with lower frequencies having comparatively higher values. With an improvement in MnO concentration of up to 0.4 wt.%, the dielectric constant value decreases with introduction of MnO. The variance of dielectric loss of frequency at different temperatures reveals a consistent pattern across all glasses.(vi)The space charge polarization increases as the glass network becomes weaker, resulting in higher measures of dielectric parameters. As more Mn³⁺ is added to the network of glasses, the space charge polarization decreases, resulting in a decrease in the measures of the dielectric parameters of the glasses.(vii)For all types of glasses at different frequencies, of these glasses is found to increase with temperature and frequency; in addition, it is observed that as decreases, MnO content was increased from 0.1 wt.% to 0.4 wt.%. This indicates that high proportion of Mn²⁺ in glass CAPM_1 (taking modiﬁer positions) and high proportion of Mn³⁺ in glass CAPM_4 (when glass former position high insulating character was considered).(viii)Finally, the results from various studies made on CdO-Al₂O₃-P₂O₅: MnO glasses reveal an improved stability of the glass network with increase in MnO content from 0.1 wt.% to 0.4 wt.%.

Data Availability

The data used to support the findings of this study are included within the article.

Disclosure

This study was performed as a part of the employment of the authors.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright © 2021 B. Kassa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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