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Calorimetric Investigation of Tricritical Behavior in Tetragonal Pb(ZrxTi1−x)O3

✍ Scribed by George A. Rossetti Jr.; Alexandra Navrotsky


Book ID
102607995
Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
181 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis


The order of the cubic tetragonal phase change in ferroelectric Pb(Zr x Ti 1؊x )O 3 (PZT) was investigated by measurements of the specific heat. The specimens studied were highly crystalline powder samples carefully prepared by chemical synthesis methods to ensure chemical homogeneity. The existence of a tricritical point in the compositional range 0.304x40.40 was established. The results demonstrated a close correspondence between the effects of hydrostatic pressure and the effects of zirconium substitution on the order of the transition. A relationship between the first-order character of the transition and the ionic packing density in the cubic structure was proposed.


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Optical characterization methods, like spectrophotometry at UV-vis-NIR wavelengths and prism-coupler method, were applied to polycrystalline Pb(Zr x Ti 1-x )O 3 thin films at various thicknesses. Thin films were deposited at room temperature by pulsed laser deposition on MgO (1 0 0) substrates and p