Heat Capacity Study of Relaxors

Author(s): Hitoshi Kawaji.

Journal Name: Current Inorganic Chemistry (Discontinued)

Volume 4 , Issue 2 , 2014

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Abstract:

The thermodynamic properties of various relaxors of PMN, PMT, PZN, PST, PMN–PT, PZN–PT, and BTZ have been reviewed and the excess thermodynamic properties are discussed. In lead-containing complex perovskite, excess heat capacity owing to the formation of PNR and glass-like low-temperature excitations are clearly observed. Studies of solid solutions indicate the difficulty of forming PNR with rhombohedral symmetry in the ferroelectric phase and the possible growth of a polar region with tetragonal symmetry in the compounds. Thus, the lead-free Ba-based relaxor BTZ35 can be considered as the frozen state of a displacive-type phase transition without disorder.

Keywords: BTZ, heat capacity, PMN, PMN–PT, PMT, polar nanoregion, PST, PZN, PZN–PT, relaxor.

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Article Details

VOLUME: 4
ISSUE: 2
Year: 2014
Page: [135 - 144]
Pages: 10
DOI: 10.2174/1877944104666140825204325
Price: $58

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