Studies of the 4d and 5d 6H perovskites Ba3BM2O9, B = Ti, Zn, Y; M = Ru, Os, and cubic BaB1/3Ru2/3O3 polymorphs stabilised under high pressure
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Date
2020-08-05
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Publisher
Royal Society of Chemistry
Abstract
The synthesis, structures and magnetism of six mixed 3d–5d oxides Ba3BM2O9 (B = Ti, Y, Zn; M = Ru, Os) are described. When prepared at ambient pressure the six oxides display a 6H type perovskite structure comprised of corner sharing BO6 and face sharing M2O9 motifs. Synchrotron X-ray diffraction reveals a small monoclinic distortion in Ba3ZnRu2O9; the remaining oxides exhibit a hexagonal structure. The magnetic properties are dominated by the M–M interactions across the shared face. Only in the mixed valent (M4+/M5+) Y oxides is evidence of long-range magnetic order found. Application of high pressure/high temperature synthetic methods for the Ru containing oxides changes the structure to the archetypical cubic Pm[3 with combining macron]m perovskite structure, where the B and Ru cations are disordered on the corner sharing BO6 octahedral sites. The magnetic properties of the cubic oxides are dominated by short range antiferromagnetic interactions, the chemical disorder inhibiting long range ordering. © The Royal Society of Chemistry 2020
Description
Keywords
Magnetism, Oxides, X-ray diffraction, Magnetic properties, Cubic lattices, Antiferromagnetism, Pressure range mega pa 10-100, Temperature range 0400-1000 K
Citation
Injac, S., Solana-Madruga, E., Avdeev, M., Brand, H. E. A., Attfield, J. P., & Kennedy, B. J. (2020). Studies of the 4d and 5d 6H perovskites Ba3BM2O9, B = Ti, Zn, Y; M = Ru, Os, and cubic BaB1/3Ru2/3O3 polymorphs stabilised under high pressure. Dalton Transactions, 49(35), 12222-12233. doi:10.1039/D0DT02349C