Study of phase transitions and properties of tetragonal (Pb,La)(Zr,Ti)O3 ceramics—II : Diffuse phase transitions and thermodynamics
Stenger, C.G.F. and Burggraaf, A.J. (1980) Study of phase transitions and properties of tetragonal (Pb,La)(Zr,Ti)O3 ceramics—II : Diffuse phase transitions and thermodynamics. Journal of Physics and Chemistry of Solids, 41 (1). pp. 25-30. ISSN 0022-3697
|Abstract:||The diffuse phase transition in tetragonal PLZT materials has been investigated. Strongly broadened permitivity curves were observed for materials with a relative high La content. Curie-Weiss behaviour in the permittivity curves is observed only at temperatures far above the apparent Curie temperature.
A latent heat effect is observed at the sharp FEt → PEc transition in PLZT x/30/70 materials with a low La content (x<16 at° La). This heat effect decreases linearly with increasing La content. The diffuse tetragonal → cubic transition is attended with a very small heat-effect and a low value (≈0.04 cal/mol°C) for the entropy difference between high and low temperature phase could be determined.
Consequently, polarisation fluctuations are possible in a certain temperature interval around the transition.
|Copyright:||© 1980 Elsevier Science|
|Link to this item:||http://purl.utwente.nl/publications/68482|
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