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  High-pressure synthesis, crystal structure, and magnetic properties of hexagonal Ba3CuOs2O9

Chen, J., Feng, H. L., Matsushita, Y., Belik, A. A., Tsujimoto, Y., Katsuya, Y., et al. (2019). High-pressure synthesis, crystal structure, and magnetic properties of hexagonal Ba3CuOs2O9. Journal of Solid State Chemistry, 272, 182-188. doi:10.1016/j.jssc.2019.02.003.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-8CC4-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-8CC6-0
Genre: Journal Article

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 Creators:
Chen, Jie1, Author
Feng, Hai L.2, Author              
Matsushita, Yoshitaka1, Author
Belik, Alexei A.1, Author
Tsujimoto, Yoshihiro1, Author
Katsuya, Yoshio1, Author
Tanaka, Masahiko1, Author
Wu, Meixia1, Author
Li, Man-Rong1, Author
Zhou, Rongfu1, Author
Zhou, Weijie1, Author
Liang, Hongbin1, Author
Zheng, Lirong1, Author
Jansen, Martin3, Author              
Yamaura, Kazunari1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: A new polymorph of the triple perovskite Ba3CuOs2O9, which usually exists in the orthorhombic phase, was synthesized under high-pressure and high-temperature conditions at 6 GPa and 1100 degrees C. Under the synthetic condition, Ba3CuOs2O9 crystallizes into a hexagonal structure (P6(3)/mmc) with a = 5.75178(1) angstrom and c = 14.1832(1) angstrom, and undergoes a 1.36% increment in density, compared to that of the orthorhombic phase. Although Ba3CuOs2O9 maintains its 6 H perovskite-type structure, the distribution of Cu and Os atoms are dramatically altered; (Cu)(4a)(Os,Os)(8f) transits to (Os)(2a)(Cu,Os)(4f) ordering over the corner- and face-sharing sites, respectively. The hexagonal Ba3CuOs2O9 exhibits a ferrimagnetic transition at 290 K, which is in stark contrast to the antiferromagnetic transition at 47 K exhibited by the orthorhombic Ba3CuOs2O9. The enhanced transition temperature is most likely due to the strongly antiferromagnetic Os5+-O-Os5+ bonds and the moderately antiferromagnetic Os5+-O-Cu2+ bonds, the angles of which are both approximately 180 degrees. The 290 K ferrimagnetic transition temperature is the highest reported for triple-perovskite osmium oxides. Besides, the coercive field is greater than 70 kOe at 5 K, which is remarkable among the coercive fields of magnetic oxides.

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 Dates: 2019
 Publication Status: Published in print
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Title: Journal of Solid State Chemistry
Source Genre: Journal
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Publ. Info: Orlando, Fla. : Academic Press
Pages: - Volume / Issue: 272 Sequence Number: - Start / End Page: 182 - 188 Identifier: ISSN: 0022-4596
CoNE: https://pure.mpg.de/cone/journals/resource/954922646045