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首页> 外文期刊>Journal of Materials Science >D.C. conduction mechanisms of certain perovskite ceramics
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D.C. conduction mechanisms of certain perovskite ceramics

机译：某些钙钛矿陶瓷的直流传导机理

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A series of a complex perovskite Ca x Sr(1 − x)TiO3 (CST) where (0 ≤ x ≤ 1) has been prepared by mechanical mixing of their oxides (CaTiO3 and SrTiO3). X-ray diffraction showed that no traces of other compounds and the line widths indicated that the products were homogeneous. The d.c. conductivity of the sample were measured over the range of temperature between 303–800 K. Temperature dependent of d.c. measurement revealed that the conductivity is thermally activated. Over the low temperature range between (333–573 K) for CaTiO3, (353–483 K) for Ca0.7Sr0.3TiO3 and (373–423 K) for Ca0.5Sr0.5TiO3 a semiconductor—metal behavior was observed. From the relationship between activation energy E a and the compositions, it has been found that E a goes through a minimum around 50% Sr—fraction. The field lowering coefficient β is evaluated experimentally.
机译：通过机械混合氧化物（CaTiO3 ，制备出一系列（0≤x≤1）的钙钛矿型Ca x Sr（1-x） TiO3 （CST） / sub>和SrTiO3 ）。 X射线衍射表明没有其他化合物的痕迹，线宽表明产物是均匀的。直流电在303–800 K的温度范围内测量样品的电导率。温度取决于d.c。测量表明，电导率是热活化的。在CaTiO3 的（333–573 K），Ca0.7 Sr0.3 TiO3 的（353–483 K）和（373–423）的低温范围内K）对于Ca0.5 Sr0.5 TiO3 半导体-金属行为。从活化能E a 与组成之间的关系，发现E a 经历最小约50％的Sr-分数。通过实验评估场降低系数β。

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  • 来源
    《Journal of Materials Science》 |2004年第5期|1711-1715|共5页
  • 作者

    H. M. El-Mallah;

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    Department of Physics Mathematical Engineering Faculty of Engineering Suez Canal University;

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