Rapid Synthesis and Characterization of an Oxygen-Deficient Defect Perovskite La_𝟒BaCu_𝟓O_{𝟏𝟑+𝜹} Phase

Table 1

Rietveld refined structural parameters for La₄BaCu₅O_13.20 compound.

Atoms	Oxidation state	Wyckoff notations	𝑥	𝑦	𝑧	Occupancy
La1	3	(4k)	0.1280(2)	0.2780(2)	0.5000	1
Ba1	2	(1d)	0.5000	0.5000	0.5000	1
Cu1	2.44	(1a)	0.0000	0.0000	0.0000	1
Cu2	2.44	(4j)	0.4165(5)	0.1719(4)	0.0000	1
O1	−2	(1b)	0.0000	0.0000	0.5000	1
O2	−2	(2e)	0.0000	0.5000	0.0000	0.10
O3	−2	(4j)	0.2822(2)	0.3936(6)	0.0000	1
O4	−2	(4j)	0.2244(3)	0.0551(5)	0.0000	1
O5	−2	(4k)	0.4119(8)	0.1501(9)	0.5000	1

Crystal system = tetragonal, lattice parameters, a = 8.6508(1), c = 3.8606(2); space group = P4/m (no. 83); R factors, 𝑅_𝑝=3.72, 𝑅_𝑤𝑝=5.27,  𝑅_{𝐵𝑟𝑎𝑔𝑔}=5.12,𝑅_𝐹=4.97.