Electrical and microstructural properties of CaTiO3-doped K1/2Na1/2NbO3-lead free ceramics

Bulletin of materials science

M A Ramírez¹  M S Castro²  L Ramajo²  R Parra² 

[1] Faculdade de Engenharia de Guaratinguetá (FEG), Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha, 333, Bairro Pedregulho, CEP 12516-410, Guaratinguetá, SP, Brazil$$Faculdade de Engenharia de Guaratinguetá (FEG), Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha, 333, Bairro Pedregulho, CEP 12516-410, Guaratinguetá, SP, BrazilFaculdade de Engenharia de Guaratinguetá (FEG), Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha, 333, Bairro Pedregulho, CEP 12516-410, Guaratinguetá, SP, Brazil$$;Institute of Research in Materials Science and Technology (INTEMA), (CONICET â€�?? Universidad Nacional de Mar del Plata), Juan B Justo 4302 (B7608FDQ), Mar del Plata, Argentina$$Institute of Research in Materials Science and Technology (INTEMA), (CONICET â€�?? Universidad Nacional de Mar del Plata), Juan B Justo 4302 (B7608FDQ), Mar del Plata, ArgentinaInstitute of Research in Materials Science and Technology (INTEMA), (CONICET â€�?? Universidad Nacional de Mar del Plata), Juan B Justo 4302 (B7608FDQ), Mar del Plata, Argentina$$

关键词: Na0.5K0.5NbO3;    CaTiO3;    lead-free ceramics;    electrical properties.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Microstructure, electrical properties and dielectric behaviour of K_1/2Na_1/2NbO₃ (KNN) and CaTiO₃- modified K_1/2Na_1/2NbO₃ (CTO-KNN) systems, were investigated. Discs doped with 0 to 0.55% mol of CaTiO₃ (CTO) were sintered at 1125°C for 2 h. Although minority phases were found in doped samples, CaTiO₃ was not detected. It was also observed that CTO changed the microstructure and grain size of KNN drastically. Also, the Curie temperature and permittivity values decreased. Addition of CTO between 0.15 and 0.45 mol% decreases the density and dielectric values. Samples prepared with higher content of CTO than 0.45 mol% showed better electrical properties.

【 授权许可】

Unknown