Sr₉In(VO₄)₇ as a model ferroelectric in the structural family of β-Ca₃(PO₄)₂-type phosphates and vanadates.

ABSTRACT: Sr₉In(VO₄)₇ was prepared by a solid-state method at 1270 K in air. This vanadate has the β-Ca₃(PO₄)₂-type structure and crystallizes in polar space group R3c. The structural parameters of Sr₉In(VO₄)₇ were refined by the Rietveld method from laboratory powder X-ray diffraction data (XRD): the lattice parameters are a = 11.18016(9) Å and c = 39.6170(3) Å with Z = 6. In³⁺ cations occupy the octahedral M5 site, Sr²⁺ cations occupy the M1, M2, and M3 sites of the β-Ca₃(PO₄)₂-type structure, and the M4 site remains vacant. Sr₉In(VO₄)₇ was characterized by differential thermal a

SUBMITTER: Belik AA 

PROVIDER: S-EPMC9050416 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature