| Autor: |
Xia, Yidong, Cai, Cong, Zhi, Xiaoyuan, Pan, Bai, Wu, Di, Meng, Xiangkang, Liu, Zhiguo |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 5/1/2006, Vol. 88 Issue 18, p182909, 3p, 4 Graphs |
| Abstrakt: |
The tunable property and thermal stability of (Ba0.25Pb0.25)Sr0.5TiO3 films derived by pulsed laser deposition have been investigated. The substitution of Pb for Ba in (Ba,Sr)TiO3 (BST) system has been revealed to raise the transition temperature close to room temperature (RT) and enhance the tuning property. It is proposed that nanopolar regions would occur in the films in the paraelectric state at RT, arising from the addition of Pb2+ into the A site of pervoskite structure of BST. This induces the relaxor behavior and diffuse phase transition. Hence, low temperature-dependent tunability is obtained due to the broadening of dielectric constant peak. These results demonstrated that Pb substitution could be a simple and effective method to obtain high tunability and good temperature stability simultaneously. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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