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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: TC increases from 35 K to 73 K for 0.5 <= x <= 1.0, TC = 81 K for x = 1.5 and 1.6, and TC = 53 K for x = 1.8.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: A-site columnar-ordered perovskites, high-pressure, crystal structures, ferrimagnets

Date published: 2024-07-19

Publisher: Wiley

Journal:

• CHEMISTRY-A EUROPEAN JOURNAL (ISSN: 15213765) p. 0-0

Funding:

• Japan Society for the Promotion of Science JP22H04601
• Kazuchika Okura Memorial Foundation 2022-11

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/chem.202401960

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Updated at: 2024-07-24 08:30:21 +0900

Published on MDR: 2024-07-24 08:30:22 +0900