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Influence of thermal treatments on the low frequency conductivity and microwave dielectric loss of CaTiO_3 ceramics

机译:热处理对CaTiO_3陶瓷低频电导率和微波介电损耗的影响

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摘要

We prepared CaTiCh by solid state reactions as a model for Ti-based microwave dielectric ceramics to investigate the influence of thermal treatment on conductivity and microwave dielectric loss. The intrinsic defect concentrations of CaTiCh may be modified by air-quenching, air-annealing and thermal treatment in various atmospheres such as O_2, Ar and air. CaTiCh has p-type conductance implying that calcium vacancy V~x_Ca may be the dominant defect. The variation in defect concentration influences the low frequency conductivity but not the microwave dielectric loss. The V~x_Ca concentration in the air-quenched sample was found to be lower than that in the air-annealed one. However, the former showed ~8% deterioration and the latter showed a 14% improvement in the Qx/value. The data, therefore, suggests that other factors such as thermally induced strain rather than intrinsic defects may influence the microwave dielectric loss.
机译:我们通过固态反应制备CaTiCh作为Ti基微波介电陶瓷的模型,以研究热处理对电导率和微波介电损耗的影响。 CaTiCh的固有缺陷浓度可以通过在各种气氛(例如O_2,Ar和空气)中进行空气淬火,空气退火和热处理来改变。 CaTiCh具有p型电导,表明钙空位V〜x_Ca可能是主要缺陷。缺陷浓度的变化会影响低频电导率,但不会影响微波介电损耗。发现经空气淬火的样品中的V〜x_Ca浓度低于经过空气退火的样品中的V〜x_Ca浓度。但是,前者的Qx /值降低了8%,而后者的Qx /值提高了14%。因此,数据表明,其他因素(如热致应变而不是固有缺陷)可能会影响微波介电损耗。

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  • 来源
    《Materials Science and Engineering》 |2011年第5期|p.401-405|共5页
  • 作者单位

    Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Material Science. Shaanxi Normal University, Xi'an 710062. PR China;

    Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Material Science. Shaanxi Normal University, Xi'an 710062. PR China;

    Beijing National Laboratory for Molecular Sciences, The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;

    Beijing National Laboratory for Molecular Sciences, The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;

    Beijing National Laboratory for Molecular Sciences, The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;

    Beijing National Laboratory for Molecular Sciences, The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;

    State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University. Beijing 100084, PR China;

    State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University. Beijing 100084, PR China;

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  • 正文语种 eng
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  • 关键词

    intrinsic defect microwave dielectric loss conductivity catio_3;

    机译:本征缺陷微波介电损耗电导率catio_3;

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