Journal
JOURNAL OF APPLIED PHYSICS
Volume 88, Issue 9, Pages 5343-5350Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1317243
Keywords
-
Categories
Ask authors/readers for more resources
The main interest in the area of practical applications of ferroelectrics, particularly at the microwave frequency, is oriented now to room temperature. In this connection, ferroelectrics like BaxSr1-xTiO3 should be carefully studied. Such materials are characterized by the second order phase transition. In a perfect ferroelectric crystal, the phase transition takes place at temperature T-C, which is called the Curie temperature. Real (defected) crystals and ceramic samples are characterized by a presence of built-in electric field and mechanical strains. In the case of the real crystal, the temperature of the phase transition T-C', is displaced to lower temperature and the temperature of the maximum of epsilon(T)T-m is displaced to higher value with respect to T-C. Thus, for the real ferroelectric sample (not for an incipient ferroelectric), one has T-C'< T-C< T-m. Some investigators suppose by default that T-C'=T-C=T-m. Such a supposition is wrong and can lead to an incorrect treatment of experimental results. In the case of a thin film sample, the phase transition and the dielectric response of a ferroelectric sample are affected by the size of the sample, what is treated as a size effect. Experimental data obtained as a result of measurement of the dielectric constant as a function of temperature can be used for finding the Curie temperature and other parameters of the material. For this procedure, a suitable model of the dielectric response of the ferroelectric sample should be used. (C) 2000 American Institute of Physics. [S0021-8979(00)07622-2].
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available