Piezoelectric Strontium Niobate and Calcium Niobate Ceramics with Super-High Curie Points

被引：94
|
作者：
Ning, Huanpo [1 ,2 ]
Yan, Haixue [1 ,2 ]
Reece, Michael J. [1 ,2 ]
机构：
[1] Queen Mary Univ London, Sch Mat Sci & Engn, London E1 4NS, England
[2] Nanoforce Technol Ltd, London E1 4NS, England
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2010年 / 93卷 / 05期
关键词：
FERROELECTRIC PROPERTIES; GRAIN-ORIENTATION; SR2NB2O7; GROWTH;
D O I：
10.1111/j.1551-2916.2009.03587.x
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The perovskite-like layer structured strontium niobate (Sr2Nb2O7) and calcium niobate (Ca2Nb2O7) are good candidates for high-temperature piezoelectric applications because of their high Curie points. Single-phase dense Sr2Nb2O7 and Ca2Nb2O7 ceramics with grain-oriented microstructures were prepared by spark plasma sintering using a two-step method. The Lotgering orientation factors were 0.86 and 0.70 for Sr2Nb2O7 and Ca2Nb2O7, respectively. The T-c of Sr2Nb2O7 and Ca2Nb2O7 were measured as 1327 +/- 5 degrees C and above 1525 degrees C, respectively. The dielectric, piezoelectric, ferroelectric properties, and direct-current electrical conductivity are higher along the directions perpendicular to the pressing direction compared with parallel. The piezoelectric constant d(33) for Sr2Nb2O7 was 2.8 +/- 0.2 pC/N.
引用
收藏
页码：1409 / 1413
页数：5
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