English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

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

MPS-Authors
/persons/resource/persons199484

Feng,  Hai L.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126670

Jansen,  Martin
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0003-8CC4-2
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.