title: B-site deficiencies in A-site-ordered perovskite LaCu3Pt(3.75)O12.
abstract: An A-site-ordered perovskite LaCu3Pt(3.75)O12 was synthesized by replacing Ca(2+) with La(3+) in a cubic quadruple AA'3B4O12-type perovskite CaCu3Pt4O12 under high-pressure and high-temperature of 15 GPa and 1100 °C. In LaCu3Pt(3.75)O12, 1/16 of B-site cations are vacant to achieve charge balance. The B-site deficiencies were evidenced by crystal structure refinement using synchrotron X-ray powder diffraction, hard X-ray photoemission spectroscopy, and soft X-ray absorption spectroscopy, leading to the ionic model La(3+)Cu(2+)3Pt(4+)(3.75)O(2-)12. Magnetic susceptibility data for this compound indicated a spin-glass-like behavior below T(g) = 3.7 K, which is attributed to disturbance of the antiferromagnetic superexchange interaction by the B-site deficiencies.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
authors.forename: Mikiko
authors.initials: M
authors.lastname: Ochi
authors.forename: Ikuya
authors.initials: I
authors.lastname: Yamada
authors.forename: Kenya
authors.initials: K
authors.lastname: Ohgushi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kusano
authors.forename: Masaichiro
authors.initials: M
authors.lastname: Mizumaki
authors.forename: Ryoji
authors.initials: R
authors.lastname: Takahashi
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Yagi
authors.forename: Norimasa
authors.initials: N
authors.lastname: Nishiyama
authors.forename: Toru
authors.initials: T
authors.lastname: Inoue
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Irifune