Sintering mechanism and dielectric properties of LiTaO₃ matrix composites with the addition of Al₂O₃ particles

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• 作者：Youfeng Zhang ; Dechang Jia ; Yu Zhou ; Qingchang Meng ; Yangai Liu ; Hua Ke
• 关键词：A. Sintering ; A. Hot pressing ; B. Interfaces ; D. Al₂O₃ ; LiTaO₃
• 刊名：Ceramics International
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：35
• 期：8
• 页码：3475-3478
• 全文大小：298 K

文摘

Highly densified Al₂O₃/LiTaO₃ (ALT) ceramic composites were fabricated by hot-pressing in a nitrogen atmosphere. The addition of Al₂O₃ particles could significantly improve the densification of LiTaO₃. Sintering mechanism of the LiTaO₃ ceramic incorporated with Al₂O₃ particles is proposed. Dielectric constant of 5 vol. % Al₂O₃/LiTaO₃ (5ALT) composite ceramic was slightly increased in the range from 30 kHz to 10⁶ Hz, but the dielectric loss was lowered in the whole range from 10³ Hz to 10⁶ Hz. Piezoelectric constant (d₃₃) of the 5ALT ceramic composite is about 50 % of that of LiTaO₃ single crystal.