Issues:
Sections:
Issue 47
MATHEMATICS AND PHYSICS
UDK: 536.227
THERMOPHYSICAL PROPERTIES OF NANOPOLAR PIEZOELECTRIC CERAMICS BASED ON LEAD ZIRCONATE – LEAD TITANATE
KALLAEV Suleyman Nurulislanovich
Specific heat, thermal expansion and deformation of PLZT-9/65/35 compound in temperature range of 150–800 K are investigated. Diffuse abnormalities were detected in the temperature dependences of heat capacity and thermal expansion over the wide range of temperatures of 250–650 K and 330–550 K respectively. It is shown that the anomalous behavior of specific heat in temperature range of 250–650 K and thermal expansion of 330–550 K is due to the growth and changes in the system of nanopolar areas. It is found out that the anomalous behavior of specific heat in temperature range of 250–650 K is due to the manifestation of two-level states (Schottky anomaly). The research results are discussed together with the data of structural and dielectric studies.
Keywords: сегнетоэлектрик; релаксор; нанополярная структура; теплоемкость; тепловое расширение; ferroelectric; relaxer; nanopolar structure; specific heat; thermal expansion.
Pages: 22 - 28
Date: 15.03.2012
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