The phase transition of (PMN)_0.67(PT)_0.33 single crystal

Peng Bao National laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, P.R., China

Feng Yan National laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, P.R., China

H. S. Luo Shanghai Institute of Ceramics, Chinese Academy of Sciences Lab. of Functional Inorganic Materials

P. C. Wang Shanghai Institute of Ceramics, Chinese Academy of Sciences Lab. of Functional Inorganic Materials

Z. W. Ying Shanghai Institute of Ceramics, Chinese Academy of Sciences Lab. of Functional Inorganic Materials

Y. N. Wang National laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, P.R., China

Abstract

The dielectric properties and mechanical properties of (PMN)_0.67(PT)_0.33 single crystal were studied. A kink of dielectric permittivity was found around 70°C, which was induced by the rhombohedral to tetragonal phase transition. A sharp increase of dielectric permittivity and a modulus softening were observed around 130°C, which correspond to the spontaneous ferroelectric-relaxor phase transition. The dielectric properties in ferroelectric phase can be strongly influenced by the cooling rate during the phase transition, which can be attributed to the size effect of subdomains.

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The phase transition of (PMN)_0.67(PT)_0.33 single crystal

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