Crystal Structure and Related Properties of Manganese-Doped Barium Titanate Ceramics

Authors


  • B. M. Kulwicki—contributing editor

  • Supported by the Kultusministerium des Landes Sachsen-Anhalt, Germany, and the Deutsche Forschungsgemeinschaft under Contract No. FKZ: 1434A/0083.

Abstract

The influence of manganese on the crystallographic phase and the microstructure of BaTi1−xMnxO3 ceramics (0 ≤x≤ 0.05) is investigated. The crystal structure at room temperature changes from tetragonal to hexagonal between x= 0.005 and 0.017, which causes a drastic change in the microstructure. The Jahn_Teller distortion caused by the MnTi3+ ions is proposed as the driving force for the phase transition. Annealing of the as-fired samples in both a reducing and oxidizing atmosphere restores the tetragonal phase, which is accompanied by a change in the microstructure based on the percentage of tetragonal phase.

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