Joint Workshop LANL/NIMS Quantum and Functional Materials and MANA International Symposium 2024

Quantum Materials - 06

Title

Three perovskite phases with different cation orders in Sm2MnMn(Mn4-xSbx)O12

Author's photo

Authors

Xuan Liang

Affiliations

Quantum Solid State Materials Group, MANA, NIMS
Graduate School of Chemical Sciences and Engineering, Hokkaido University

URL

https://www.nims.go.jp/mana/research/j4phan00000005e8.html

Email

LIANG.Xuan@nims.go.jp

Abstract

Cation order, which can be controlled by synthesis conditions and stoichiometry, plays an important role in properties of perovskite materials. Here we show that aliovalent doping by Sb5+ in Sm2MnMn(Mn4-xSbx)O12 quadruple perovskite solid solutions can control cation orders in both A and B sites. Samples with 0.4 ≤ x ≤ 2 were synthesized by a high-pressure, high-temperature method at 6 GPa and 1770 K. Three regions with different cation orders were found at 0.5 ≤ x ≤ 1.0, x = 1.5–1.6, and x = 1.8. The 0.5 ≤ x ≤ 1.0 compositions have a B-site-disordered and A-site columnar-ordered structure with space group P42/nmc; the x = 1.5 and 1.6 samples have a B-site rock-salt-ordered and A-site columnar-ordered structure with space group P42/n; the x = 1.8 sample has a B-site rock-salt-ordered and A-site-disordered structure with space group P21/n. All the samples show one ferrimagnetic transition.

Fig. 1. Fragments of crystal structures of Sm2MnMn(Mn4-xSbx)O12 with different space groups in a polyhedral presentation. a) P42/nmc, b) P42/n, and c) P21/n. Mn1O4 square-planar (yellow), Mn2O4 tetrahedra (blue), (Mn/Sb)6 or (Sb/Mn)O6 octahedra (orange), and Mn3O6 or MnO6 octahedra (purple) are show.

Reference

  1. X. Liang, K. Yamaura, A.A. Belik, Chemistry – A European Journal. 30 (41), e202401960, (2024). DOI 10.1002/chem.202401960
  2. A.A. Belik, Dalton Transactions 47(10), 3209-3217, (2018). DOI 10.1039/c7dt04490a