Title :
Size and pressure effect on the phase transition of BaTiO3 nanoceramics
Author :
Zhu, Jinlong ; Lin, Shan ; Jin, Changqing
Author_Institution :
The Institute of Physics, Chinese Academy of Sciences, P.O.Box 603, Beijing 100080, China
Abstract :
Grain size effects on the dielectric properties of BaTiO3 (BTO) nanoceramics have been studied by using the modified Ginsburg-Landau-Devonshire (GLD) thermodynamic theory. Considering the existence of internal stresses, it is found that with decreasing grain size the transition temperature of cubic to tetragonal phase decreases. Temperature dependence of the dielectric constant of nano-grain BTO ceramic has been investigated under hydrostatic pressure up to 5 GPa. Adding the hydrostatic pressure and inter-granular stress contributions to a simple GLD type thermodynamic model provides a satisfactory explanation to our experimental results.
Keywords :
Ceramics; Dielectric constant; Grain size; Internal stresses; Nonhomogeneous media; Physics; Pressure effects; Scanning electron microscopy; Temperature dependence; Thermodynamics;
Conference_Titel :
Applications of Ferroelectrics, 2008. ISAF 2008. 17th IEEE International Symposium on the
Conference_Location :
Santa Re, NM, USA
Print_ISBN :
978-1-4244-2744-4
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2008.4693761
