Sintering and electrical properties of Na0.5K0.5NbO3 ceramics modified with lanthanum and iron oxides

被引：30

作者：

Zuo, Ruzhong ^{[1
]}

Min Wang ^{[1
]}

Bing Ma ^{[1
]}

Jian Fu ^{[1
]}

Tao Li ^{[2
]}

机构：

[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China

[2] Gen Res Inst NonFerrous Met, Superconducting Mat Res Ctr, Beijing 100088, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2009年 / 70卷 / 3-4期

关键词：

Ceramics; Ferroelectricity; Microstructure; Piezoelectricity; FREE PIEZOELECTRIC CERAMICS; LEAD-FREE CERAMICS; SYSTEMS; MICROSTRUCTURE; PIEZOCERAMICS; NA;

D O I：

10.1016/j.jpcs.2009.03.003

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Effects of La3+, Fe3+ doping and their co-doping on the sintering, structures and electrical properties of Na0.5K0.5NbO3 (NKN) ceramics were investigated. A significant modification of sintering behavior can be obtained by the addition of Fe2O3. On the contrary, the addition of La2O3 and La-FeO3 tends to degrade the densification. Moreover, Fe3+ doping does not change the crystal structure, thus leading to an unchanged Curie temperature. Owing to a transition from orthorhombic to pseudo-cubic structures, the Curie temperatures of NKN ceramics were significantly lowered by doping La2O3 and La-FeO3. NKN ceramics modified with a small amount of Fe2O3 and La-FeO3 (less than 0.5 mol%) exhibit improved ferroelectric, piezoelectric and electromechanical properties. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：750 / 754

页数：5

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