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ABO3 perovskite materials with small cations at the A site, especially with ordered cation arrangements, have attracted a lot of interest because they show unusual physical properties and deviations from general perovskite tendencies. In this work, A-site-ordered quadruple perovskites, RMn3Ni2Mn2O12 with R = Nd, Sm, Gd, and Dy, were synthesized by a high-pressure, high-temperature method at about 6 GPa. Annealing at about 1500 K produced samples with additional (partial) B-site ordering of Ni2+ and Mn4+ cations, crystallizing in space group Pn-3. Annealing at about 1700 K produced samples with disordering of Ni2+ and Mn4+ cations, crystallizing in space group Im-3. However, magnetic properties were nearly identical for the Pn-3 and Im-3 modifications in comparison with ferromagnetic double perovskites R2NiMnO6, where the degree of Ni2+ and Mn4+ ordering has significant effects on magnetic properties. In RMn3Ni2Mn2O12, one magnetic transition was found at 26 K (for R = Nd), 23 K (for R = Sm), and 22 K (for R = Gd), and two transitions were found at 10 K and 36 K for R = Dy. Curie-Weiss temperatures were close to zero in all compounds suggesting that antiferromagnetic and ferromagnetic interactions are of the same magnitude.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: A-site-ordered perovskites, high-pressure synthesis, synchrotron X-ray diffraction, crystal structures, magnetic properties

Date published: 2024-11-21

Publisher: MDPI AG

Journal:

• Molecules (ISSN: 14203049) vol. 29 issue. 23 5488

Funding:

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

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

MDR DOI:

First published URL: https://doi.org/10.3390/molecules29235488

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Updated at: 2024-12-16 16:30:48 +0900

Published on MDR: 2024-12-16 16:30:48 +0900