Ferroelectricity and solid-solution structure of KNbO3 ceramics doped with La and Fe

被引：5

作者：

Kakimoto, K ^{[1
]}

Masuda, I ^{[1
]}

Ohsato, H ^{[1
]}

机构：

[1] Nagoya Inst Technol, Grad Sch Engn, Dept Mat Sci & Engn, Showa Ku, Nagoya, Aichi 4668555, Japan

来源：

ELECTROCERAMICS IN JAPAN VII | 2004年 / 269卷

关键词：

KNbO3; La2O3; Fe2O3; P-E hysteresis loop; piezoelectric constant;

D O I：

10.4028/www.scientific.net/KEM.269.7

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：

Co-doping of La2O3 and Fe2O3, has to be found to work effectively as an additive for densification of KNbO3 ceramics through ordinary pressure-less sintering process. X-ray diffraction analysis revealed that the co-doped KNbO3 formed a single (K1-xLax)(Nb1-xFex)O-3 solid solution and changed in the crystal system from orthorhombic to tetragonal at x of 0.020, and from tetragonal to cubic at x greater than or equal to 0.200. X-ray absorption near edge structure (XANES) of Fe k-edge revealed that valence change of Fe might occur in the specimen with x=0.004. 2 The x=0.002 specimen demonstrated a well-saturated P-E hysteresis loop with P-r of 18 muC/cm(2) and E-c of 9 kV/cm, and showed k(p) of 0.17, k(i) of 0.47 and d(33) of 98 pC/N in the piezoelectric measurement.

引用

页码：7 / 10

页数：4

共 8 条

[1] PROPERTIES OF HOT-PRESSED FERROELECTRIC ALKALI NIOBATE CERAMICS [J].