J. Mater. Sci. Technol.

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La Doping Effect on the Dielectric Property of Barium Strontium Titanate Glass–Ceramics

Jichun Chen   

  1. Shenyang Research and Development Centre for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China
  • Received:2012-06-26 Revised:2012-12-27 Online:2014-03-15 Published:2014-03-17
  • Contact: J. Chen
  • Supported by:

    National Natural Science Foundation of China (No. 50902082) and the State Key Laboratory of Electrical Insulation and Power Equipment (EIPE11208) are gratefully acknowledged.

Abstract:

Ferroelectric barium strontium titanate (BST) glass–ceramics doped with different content of La2O3 were prepared via the melt-quenching technique followed by controlled crystallization. The microstructures of crystallized samples were examined by X-ray diffraction and scanning electron microscopy. Dielectric properties were also investigated. The aliovalent substitution of Ba by La induced dispersion of semiconducting BaxSr1−xTiO3 crystallites sealed in a glassy silicate matrix, which increased the εr and loss tangent values of the BST glass–ceramic. The experimental results indicate that aliovalent substitution is an effective method to process glass–ceramics with better dielectric properties.

Key words: Microstructure-final, Dielectric properties, Glasseceramics, Aliovalent substitution