Mn-doped BaO-(Nd0.7,Sm0.3)2O 3-4TiO2 ceramic sintered in a reducing atmosphere

Wen His Lee, Chi Yi Su, Ying Chieh Lee

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Abstract

The effect of MnCO3 doping from 0 to 55 mol % into BaP-(Nd 0.7Sm0.3)2O3-4TiO2 (BNST) sintered in a reducing atmosphere on the phase transformation, microstructure and electrical properties was studied. The variation of d-spacing with Mn content can be divided into three regimes in this study. In regime (I), 0 to 5 mol % Mn-doped BNST, the d-spacing decreases successively until 5 mol % which is the maximum solubility, because Mn+3 is incorporated into Ti +4-sites of BNST. In regime (II), 5 to 42 mol % Mn-doped BNST, the d-spacing remains constant and Mn2O3 is precipitated because the amount of MnCO3 doped is more than the solubility. In regime (III), 43 to 55 mol % Mn-doped BNST, the d-spacing is the same as BNST without MnCO3 doping. Heavily doping MnCO3 into BNST gives rise to two parallel reactions, forming two ternary systems, BaO-(Nd,Sm) 2O3-TiO2 and BaO-(Nd,Sm)2O 3-Mn2O3. Mn-doped BNST sintered in a reducing atmosphere is in a semiconducing state in regimes (I) and (II), because the concentration of free electron is higher than that of the acceptors. In contrast, Mn-doped BNST in regime (III) sintered in a reducing atmosphere is in an insulating state because the concentration of the acceptors is higher than that of liberated free electron.

Original languageEnglish
Pages (from-to)1562-1567
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number4 A
DOIs
Publication statusPublished - 2007 Apr 5

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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