Mandal, P. ; Iyo, A. ; Tanaka, Y. ; Sundaresan, A. ; Rao, C. N. R. (2010) Structure, magnetism and giant dielectric constant of BiCr0.5Mn0.5O3synthesized at high pressures Journal of Materials Chemistry, 20 (9). pp. 1646-1650. ISSN 0959-9428
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Official URL: http://doi.org/10.1039/B914350P
Related URL: http://dx.doi.org/10.1039/B914350P
Abstract
BiCr0.5Mn0.5O3, synthesized at high pressure and high temperature, has a monoclinic structure (space group C2/c) at room temperature with a = 9.4590(3) Å, b = 5.5531(2) Å, c = 9.6465(3) Å and β = 108.149(2)°. It undergoes a structural transition from the monoclinic to an orthorhombic (Pnma) symmetry around 650 K. Magnetic measurements show three distinct anomalies at 25, 50 and 97 K. AC susceptibility measurements confirm the occurrence of the magnetic anomalies, but suggest no spin frustration. Interestingly, this oxide shows a giant dielectric constant at room temperature. Two clear relaxation processes commencing around 200 K and 300 K are exhibited by this material. The first relaxation process is due to Maxwell-Wagner polarization at the grain boundary whereas the second relaxation may arise from hopping of electrons in the B-site.
Item Type: | Article |
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Source: | Copyright of this article belongs to Royal Society of Chemistry. |
ID Code: | 120078 |
Deposited On: | 22 Jun 2021 07:23 |
Last Modified: | 22 Jun 2021 07:23 |
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