Simulation of Material Properties of Barium Titanate Single Crystal with Multidomain Structure Using Modified Time-Dependent Devonshire--Ginzburg--Landau Model

• Published in: Japanese Journal of Applied Physics 2012-05, Vol.51 (5), p.051501-051501-7
• Main Authors: Imanaga, Syunji, Miura, Kaoru
• Format: Article
• Language: English
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/JJAP.51.051501

We simulated and compared the material properties of the tetragonal phase of barium titanate for two types of multidomain structures, namely, multidomain-1 including both 90 and 180° domains, and multidomain-2 including only the 180° domain, and a monodomain by using a modified time-dependent Devonshire--Ginzburg--Landau model of two dimensions. We found that the piezoelectric coefficient $d_{12}$ and dielectric susceptibility $\eta_{22}$ of muiltidomain-1 are about 6.5 times larger than those of the monodomain, and the large values of $d_{12}$ and $\eta_{22}$ of multidomain-1 are explained by considering its peculiar multidomain structure. Moreover, we found that the piezoelectric coefficient $d_{22}$ of muiltidomain-2 before polling is about one-half that of the monodomain, and that of muiltidomain-2 after polling is about two times larger than that before polling, whereas the value of $\eta_{22}$ before polling is three times larger than that after polling.