Magnetism in Mixed Valence, Defect, Cubic Perovskites: BaIn1–x Fe x O2.5+δ, x = 0.25, 0.50, and 0.75. Local and Average Structures

The series BaIn_1-x Fe _x O_2.5+δ, x = 0.25, 0.50, and 0.75, has been prepared under air-fired and argon-fired conditions and studied using X-ray diffraction, d.c. and a.c. susceptibility, Mössbauer spectroscopy, neutron diffraction, X-ray near edge absorption spectroscopy (XANES), and X-ray pair distribution (PDF) methods. While Ba₂In₂O₅ (BaInO_2.5) crystallizes in an ordered brownmillerite structure, Ibm2, and Ba₂Fe₂O₅ (BaFeO_2.5) crystallizes in …