Electrical and Microstructural Properties of CaTiO3-doped K1/2Na1/2NbO3-Lead Free Ceramics

LEANDRO ALFREDO RAMAJO; RODRIGO PARRA; MIGUEL ANGEL RAMIREZ; MIRIAM SUSANA CASTRO

BULLETIN OF MATERIALS SCIENCE

INDIAN ACAD SCIENCES

Lugar: Bangalore ; Año: 2011 vol. 34 p. 1213 - 1217

0250-4707

Microstructure, electrical properties and dielectric behavior of K1/2Na1/2NbO3 (KNN) and CaTiO3-modified K1/2Na1/2NbO3 (CTO-KNN) systems, were investigated. Discs doped with 0 to 0.55% mol of CaTiO3 (CTO) were sintered at 1125ºC for 2h. Although minority phases were found in doped samples, CaTiO3 was not detected. It was also observed that CTO changed drastically the microstructure and grain size of KNN. Also, the Curie temperature and permittivity values decreased. Addition of CTO between 0.15 and 0.45mol % decreases the density and dielectric values. Samples prepared with higher content of CTO than 0.45mol% showed better electrical properties.