B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy
ABO<sub>3</sub> 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 per...
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2024-11-01
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| author | Alexei A. Belik Ran Liu Masahiko Tanaka Kazunari Yamaura |
| author_facet | Alexei A. Belik Ran Liu Masahiko Tanaka Kazunari Yamaura |
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| description | ABO<sub>3</sub> 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, RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> 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 Ni<sup>2+</sup> and Mn<sup>4+</sup> cations, crystallizing in space group <i>Pn</i>–3. Annealing at about 1700 K produced samples with disordering of Ni<sup>2+</sup> and Mn<sup>4+</sup> cations, crystallizing in space group <i>Im</i>–3. However, magnetic properties were nearly identical for the <i>Pn</i>–3 and <i>Im</i>–3 modifications in comparison with ferromagnetic double perovskites R<sub>2</sub>NiMnO<sub>6</sub>, where the degree of Ni<sup>2+</sup> and Mn<sup>4+</sup> ordering has significant effects on magnetic properties. In RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub>, 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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| spelling | doaj-art-bef2e4cd021e4672a1a703f205a44ebc2025-08-20T02:38:36ZengMDPI AGMolecules1420-30492024-11-012923548810.3390/molecules29235488B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and DyAlexei A. Belik0Ran Liu1Masahiko Tanaka2Kazunari Yamaura3Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Ibaraki, JapanResearch Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Ibaraki, JapanNational Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba 305-0047, Ibaraki, JapanResearch Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Ibaraki, JapanABO<sub>3</sub> 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, RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> 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 Ni<sup>2+</sup> and Mn<sup>4+</sup> cations, crystallizing in space group <i>Pn</i>–3. Annealing at about 1700 K produced samples with disordering of Ni<sup>2+</sup> and Mn<sup>4+</sup> cations, crystallizing in space group <i>Im</i>–3. However, magnetic properties were nearly identical for the <i>Pn</i>–3 and <i>Im</i>–3 modifications in comparison with ferromagnetic double perovskites R<sub>2</sub>NiMnO<sub>6</sub>, where the degree of Ni<sup>2+</sup> and Mn<sup>4+</sup> ordering has significant effects on magnetic properties. In RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub>, 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.https://www.mdpi.com/1420-3049/29/23/5488A-site-ordered quadruple perovskitesB-site double orderingcrystal structuresstructural disorder |
| spellingShingle | Alexei A. Belik Ran Liu Masahiko Tanaka Kazunari Yamaura B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy Molecules A-site-ordered quadruple perovskites B-site double ordering crystal structures structural disorder |
| title | B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy |
| title_full | B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy |
| title_fullStr | B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy |
| title_full_unstemmed | B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy |
| title_short | B-Site-Ordered and Disordered Structures in A-Site-Ordered Quadruple Perovskites RMn<sub>3</sub>Ni<sub>2</sub>Mn<sub>2</sub>O<sub>12</sub> with R = Nd, Sm, Gd, and Dy |
| title_sort | b site ordered and disordered structures in a site ordered quadruple perovskites rmn sub 3 sub ni sub 2 sub mn sub 2 sub o sub 12 sub with r nd sm gd and dy |
| topic | A-site-ordered quadruple perovskites B-site double ordering crystal structures structural disorder |
| url | https://www.mdpi.com/1420-3049/29/23/5488 |
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