Influence of Stress and Chemical Homogeneity on Dielectric Properties of BaTi0.9Zr0.1O3

• Published in: Journal of the American Ceramic Society 2000-10, Vol.83 (10), p.2610-2612
• Main Authors: van der Gijp, Sven, ten Elshof, Johan E., Steigelmann, Oliver, Verweij, Henk
• Format: Article
• Language: English
• Subjects: barium titanate; Condensed matter: electronic structure, electrical, magnetic, and optical properties; dielectric materials/properties; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Permittivity (dielectric function); Physics; stress
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.2000.tb01597.x

The influence of mechanical stress and chemical homogeneity on the permittivity of BaTi0.9Zr0.1O3 ceramics prepared from mixed‐oxide and hydrothermal powders was studied. To reduce stress, liquid‐phase sintering was applied in conjunction with a low heating rate to stimulate the formation of large grains. The influence of chemical homogeneity was studied by variations in sintering temperatures and times. For both types of ceramics, the dielectric constant at the Curie temperature was influenced by both factors, but to a different extent. In the mixed oxide ceramic, chemical homogeneity played a more prominent role, while internal stress appeared to exert a larger influence in the hydrothermal ceramics. The dielectric constant at the Curie temperature could be increased by 5%–10% by an annealing treatment at 200°C, followed by slow cooling.