Microstructural Study of Neodmium Nickelate Doped with Strontium Synthesized by Gelatin Method

Table 1

Refinement parameters of system Nd_2−𝑥Sr_𝑥NiO₄ to 𝑥=0 and 𝑥=0.4 calcined at 700°C and 900°C.

Sample	𝑅 Bragg	Phase	ICSD	Crystalline; system	Space; Group	Crystallite size (nm)	𝑎; (Å)	𝑏; Å	𝑐; Å
Nd2−𝑥Sr𝑥NiO4; 𝑥=0; 700°C	11.5	Nd2O3	32514	Trigonal	P-3m1	35.51	3.8302	3.8302	6.0046
		NiO	9866	Cubic	Fm-3m	20	4.1791	4.1791	4.1791
		NdNiO3	67722	Orthorhombic	Pbnm:cab	87.13	5.4311	5.4049	7.7910
Nd2−𝑥Sr𝑥NiO4; 𝑥=0; 900°C	13.2	Nd2O3	32514	Trigonal	P-3m1	68.30	3.8301	3.8301	6.0036
		NiO	9866	Cubic	Fm-3m	42.94	4.1793	4.1793	4.1793
		NdNiO3	67722	Orthorhombic	Pbnm:cab	43.78	5.5115	5.4280	7.6705
		Nd2NiO4	71137	Orthorhombic	Bmab	100	3.8054	12.3934	7.7910
Nd2−𝑥Sr𝑥NiO4; 𝑥=0.4; 700°C	12.07	Nd1,6Sr0,4NiO4	71138	Tetragonal	I4/mmm	59.61	3.7831	3.7831	12.4603
		NiO	9866	Cubic	Fm-3m	23.91	4.1803	4.1803	4.1803
		Nd2O3	32514	Trigonal	P-3m1	100	3.8272	3.8272	5.9910
Nd2−𝑥Sr𝑥NiO4; 𝑥=0.4; 900°C	10.5	Nd1,6Sr0,4NiO4	71138	Tetragonal	I4/mmm	110	3.7840	3.7840	12.4584
		NiO	9866	Cubic	P-3m1	64.79	4.1791	4.1791	4.1791