High-Pressure Synthesis and Ferrimagnetism of Ni3TeO6-Type Mn2ScMO6 (M = Nb, Ta)

Hai L Feng; Zheng Deng; Mark Croft; Saul H Lapidus; Rui Zu; Venkatraman Gopalan; Christoph P Grams; Joachim Hemberger; Sizhan Liu; Trevor A Tyson; Corey E Frank; Changqing Jin; David Walker; Martha Greenblatt

doi:10.1021/acs.inorgchem.9b02468

High-Pressure Synthesis and Ferrimagnetism of Ni₃TeO₆-Type Mn₂ScMO₆ (M = Nb, Ta)

Inorg Chem. 2019 Dec 2;58(23):15953-15961. doi: 10.1021/acs.inorgchem.9b02468. Epub 2019 Nov 14.

Authors

Affiliations

¹ Department of Chemistry and Chemical Biology , Rutgers, the State University of New Jersey , 610 Taylor Road , Piscataway , New Jersey 08854 , United States.
² Institute of Physics, School of Physics, University of Chinese Academy of Sciences , Chinese Academy of Sciences , P.O. Box 603, Beijing , 100190 , China.
³ Department of Physics and Astronomy , Rutgers, the State University of New Jersey , 136 Frelinghuysen Road , Piscataway , New Jersey 08854 , United States.
⁴ Advanced Photon Source , Argonne National Laboratory , Lemont , Illinois 60439 , United States.
⁵ Department of Materials Science and Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States.
⁶ Physikalisches Institut , Universität zu Köln , D 50937 Köln , Germany.
⁷ Department of Physics , New Jersey Institute of Technology , Newark , New Jersey 07102 , United States.
⁸ Lamont Doherty Earth Observatory , Columbia University , 61 Route 9W , P.O. Box 1000, Palisades , New York 10964 , United States.

PMID: 31724852
DOI: 10.1021/acs.inorgchem.9b02468

Abstract

The corundum-related oxides Mn₂ScNbO₆ and Mn₂ScTaO₆ were synthesized at high pressure and high temperature (6 GPa and 1475 K). Analysis of the synchrotron powder X-ray diffraction shows that Mn₂ScNbO₆ and Mn₂ScTaO₆ crystallize in Ni₃TeO₆-type noncentrosymmetric crystal structures with space group R3. The asymmetric crystal structure was confirmed by second harmonic generation measurement. X-ray absorption near-edge spectroscopies indicate formal valence states of Mn²⁺₂Sc³⁺Nb⁵⁺O₆ and Mn²⁺₂Sc³⁺Ta⁵⁺O₆, also supported by the calculated bond valence sums. Both samples are electrically insulating. Magnetic measurements indicate that Mn₂ScNbO₆ and Mn₂ScTaO₆ order ferrimagnetically at 53 and 50 K, respectively, and Mn₂ScTaO₆ is found to have a field-induced magnetic transition.