Preparation, properties and characterization of CaTiO3-modified Pb(Fe1/2Nb1/2)O3 dielectrics

• Published in: Journal of the European Ceramic Society Vol. 23; no. 11; pp. 1919 - 1924
• Main Authors: HU, X, CHEN, X. M, WU, S. Y
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 01.10.2003
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric loss and relaxation; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electrotechnical and electronic ceramics; Exact sciences and technology; Permittivity (dielectric function); Physics; Technical ceramics; Lead oxide; Dielectric loss; Densification; Perovskite type compound; Electrical properties; Iron Niobium Lead Oxides Mixed; Dielectric properties; Calcium Titanates; Microwave; Experimental study; Lattice parameters; X ray diffraction; Oxide ceramics; Dielectric ceramics; Iron Oxides; Additive; Niobium Oxides; Sintering; Chemical preparation; Solid state reaction; Manufacturing; Permittivity; Raman spectrum; Electroceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(02)00450-8

CaTiO3 modified Pb(Fe1/2Nb1/2)O3 dielectrics were prepared by a solid-state reaction process and the structural analysis was performed together with the dielectric characterisation. The cubic perovskite structures were identified by XRD for all compositions in this system. The short-range order in the dielectrics was revealed by Raman spectroscopy as the complementarities of XRD. The Raman spectra showed structure transition with the CaTiO3 content increasing to 0.9. The effects of incorporating CaTiO3 on the dielectric properties of Pb(Fe1/2Nb1/2)O3 dielectrics were connected to the shifting Curie temperature to the low temperature side and the structure transition. Low loss dielectrics with reduced temperature coefficient and high dielectric constant were obtained and good microwave dielectric properties were obtained in the present modified dielectrics. 22 refs.