Sol-Gel Synthesis, X-Ray Diffraction Studies, and Electric Conductivity of Sodium Europium Silicate

Table 4

DC and AC conductivity and activation energy for the samples.

Composition	𝜎 (500°C),	𝜎 (600°C),	𝜎 (700°C),	𝐸𝐴, eV
	mScm^−1	mScm^−1	mScm^−1
NaEu9(SiO4)6O2 (direct current)	0.547	1.887	3.120	0.62
NaEu9(SiO4)6O2 (1000 Hz)	1.257	2.681	4.059	0.77
La9.33Si6O26 [3]	0.023	—	0.26	0.84
La9Mg0.5Si6O26 [3]	0.021	—	—	0.98
La8.67SrSi6O26 [3]	0.083	—	—	0.87
La8.67CaSi6O26 [3]	0.058	—	—	0.87