DocumentCode :
3150440
Title :
Ferroelectric ceramics in the Na0.5Bi0.5TiO 3-K0.5Bi0.5TiO3, Na0.5 Bi0.5TiO3-PbTiO3 and K0.5 Bi0.5TiO3-PbTiO
Author :
Elkechai, O. ; Mercurio, J.P.
Author_Institution :
Lab. de Mater. Ceramiques et Traitements de Surface, CNRS, Limoges, France
fYear :
1991
fDate :
33457
Firstpage :
253
Lastpage :
256
Abstract :
The study of the Na0.5Bi0.5TiO3-K 0.5Bi0.5TiO3, Na0.5Bi0.5TiO3-PbTiO3 and K 0.5Bi0.5TiO3-PbTiO3 systems was carried our using X-ray diffraction, DSC and dielectric measurements. The limits of the rhombohedral (Na0.5Bi0.5 TiO3-rich side) and orthorhombic (K0.5Bi0.5TiO3, and PbTiO3-rich side) solid solutions were determined, as well as the evolutions of their lattice parameters as a function of composition. Ceramic materials have been prepared by natural sintering (1090-1220°C/0.5 h) of powders obtained by solid state reaction (900-1000°C/20 h) of the corresponding oxides and carbonates. The dielectric permittivities of these materials have been measured in a wide frequency range between 20 and 800°C. The results showed that they all are ferroelectric at room temperature and some of them exhibit a relaxer-type behaviour. Several specular compositions showed the best piezoelectric characteristics for this type of ceramic materials
Keywords :
X-ray diffraction; bismuth compounds; ferroelectric materials; lattice constants; lead compounds; permittivity; piezoceramics; piezoelectric materials; potassium compounds; sodium compounds; thermal analysis; 1090 to 1220 degC; 20 to 800 degC; 900 to 1000 degC; DSC; K0.5Bi0.5TiO3-PbTiO3; Na0.5Bi0.5TiO3-K0.5Bi0.5TiO 3; Na0.5Bi0.5TiO3-PbTiO3; X-ray diffraction; ceramic materials; composition; dielectric measurements; dielectric permittivities; ferroelectric ceramics; lattice parameters; orthorhombic phase; piezoelectric characteristics; relaxer-type behaviour; rhombohedral phase; room temperature; sintering; solid state reaction; Bismuth; Ceramics; Dielectric materials; Dielectric measurements; Ferroelectric materials; Lattices; Organic materials; Powders; Solids; X-ray diffraction;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
Type :
conf
DOI :
10.1109/ISAF.1994.522351
Filename :
522351
Link To Document :
