Issue 9, 2010

Structure, magnetism and giant dielectric constant of BiCr0.5Mn0.5O3 synthesized at high pressures

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.

Graphical abstract: Structure, magnetism and giant dielectric constant of BiCr0.5Mn0.5O3 synthesized at high pressures

Article information

Article type
20th Anniversary Article
Submitted
16 Jul 2009
Accepted
27 Oct 2009
First published
16 Dec 2009

J. Mater. Chem., 2010,20, 1646-1650

Structure, magnetism and giant dielectric constant of BiCr0.5Mn0.5O3 synthesized at high pressures

P. Mandal, A. Iyo, Y. Tanaka, A. Sundaresan and C. N. R. Rao, J. Mater. Chem., 2010, 20, 1646 DOI: 10.1039/B914350P

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