Study of phase transitions and properties of tetragonal (Pb, La) (Zr, Ti)O3 ceramics—III : Transitions induced by electric fields

Stenger, C.G.F. and Burggraaf, A.J. (1980) Study of phase transitions and properties of tetragonal (Pb, La) (Zr, Ti)O3 ceramics—III : Transitions induced by electric fields. Journal of Physics and Chemistry of Solids, 41 (1). pp. 31-41. ISSN 0022-3697

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Abstract:	The phase diagram of electrically poled, tetragonal PLZT materials has been investigated. In the higher La concentration range, a tetragonal, so-called β-phase occurs, which has no clear FE properties. The transition to the FEt phase has first order character and takes place only after a strong electric field has been applied to the material. The energetics of theβt ah FEt transition were investigated in several ways. The heat-effects associated with this transition have a small value of 6–20cal/mol, dependent on composition. The transition βt ah FEt is accompanied by a relatively large activation energy ΔG2. The ΔG2(T) curve shows a minimum for materials, which do not show a spontaneous transition to the FEt phase. This minimum value of ΔG2 (1–2.5 cal/mol) is large in comparison to the average thermal energy kT and prevents the spontaneous transition from the βt phase to the FEt phase.
Item Type:	Article
Copyright:	© 1980 Elsevier Science
Link to this item:	http://purl.utwente.nl/publications/68481
Official URL:	http://dx.doi.org/10.1016/0022-3697(80)90116-X
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