Phase Transitions and Relaxation Behaviors in Barium Strontium Titanate Ceramics Determined by Dynamic Mechanical and Dielectric Analysis

作者：Yu, Yao; Zou, Hua; Cao, Qiu-Feng; Wang, Xu-Sheng^*; Li, Yan-Xia; Yao, Xi

来源：Ferroelectrics, 2015, 487(1): 77-85.

DOI：10.1080/00150193.2015.1070641

• Ba1-xSrxTiO3
• dielectric analysis
• DMA
• phase transition
• relaxation process

Barium strontium titanate (Ba1-xSrxTiO3) ceramics were prepared by solid-state reaction method. XRD patterns showed that BT (x = 0) and BST2 (x = 0.2) ceramics presented tetragonal phase, while BST4 (0.4) and BST6 (0.6) ceramics showed cubic phase at room temperature. The relative permittivity and dissipation factor of Ba1-xSrxTiO3 ceramics with temperature of 125-425K were characterized at 1-100kHz by LCR meter. The Young's modulus and internal friction of Ba1-xSrxTiO3 ceramics in the range of 125K-425K at different vibration frequencies were tested by a Dynamic Mechanical Analysis (DMA) system. Compared with the dielectric measurement, mechanical analysis was more sensitive to reflect the phase transition and relaxation process. All Ba1-xSrxTiO3 samples showed three phase transitions, the transition temperatures decreased and the phase transition diffused as Sr content increased. Besides, a relaxation process caused by the interaction between domain walls and lattice defects emerged in pure BT ceramic, while it disappeared in all BST ceramics.

• 出版日期2015-10-8
• 单位江苏大学; 同济大学