Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624055 | Ceramics International | 2016 | 8 Pages |
Abstract
A series of NBT-KBT lead-free crystals with dimensions of Φ 35Ã10 mm were successfully grown by the TSSG method. The as-grown crystals possess rhombohedral perovskite structure at room temperature. The curves ε(T) for all crystals show two abnormal dielectric peaks. The depolarization temperatures Td derived from the first peak of curves tan δ(T) vary with the KBT content, which are 130, 150, 140, and 115 °C respectively, for (100âx)NBTâxKBT (x=5, 8, 12, 15) crystals, being well consistent with the Td obtained from the temperature dependence of kt. A notable thermal hysteresis, ÎTâ35 °C, for ferroelectric-antiferroelectric phase transition was also disclosed for 92NBT-8KBT crystal. The investigation of orientation dependence for electrical properties disclosed the dielectric parameters show weak anisotropy. The piezoelectric constants (d33) are 147, 175, 205, 238 pC/N and the values of kt are 38%, 52%, 52%, 54%, respectively for (100âx)NBTâxKBT (x=5, 8, 12, 15) crystals.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Renbing Sun, Jinzhi Wang, Fang Wang, Tangfu Feng, Fengyu Kong, Xianglian Liu, Yanlong Li, Haosu Luo,