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    • Keywords


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

    • Abstract


      Microstructure, electrical properties and dielectric behaviour 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 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.

    • Author Affiliations


      L Ramajo1 R Parra1 M A Ramírez2 M S Castro1

      1. Institute of Research in Materials Science and Technology (INTEMA), (CONICET – Universidad Nacional de Mar del Plata), Juan B Justo 4302 (B7608FDQ), Mar del Plata, Argentina
      2. 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
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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