Effect of synthesis duration on heat and charge transport in polycrystalline CuCr1-xMgxO2

Abstract

Magnesium-doped polycrystalline ceramic samples of cooper chromite (I) have been prepared by solid phase synthesis. Phase composition and crystal structure of synthesis have been investigated by X-ray diffraction. Microstructure of samples has been investigated by scanning electron microscopy. Thermal conductivity and electrical conductivity have been measured in the temperature range 78

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合成时间对CuCr1-xMgxO2多晶热电荷输运的影响

采用固相合成方法制备了掺镁铬酸铜多晶陶瓷样品。用X射线衍射方法研究了合成物的相组成和晶体结构。用扫描电子显微镜研究了样品的微观结构。在78＜T＜320 K的温度范围内测量了热导率和电导率。随着合成持续时间的增加，观察到热导率显著降低。这种效应可以通过形成少量的MgCr2O4、Cr2O3和CuO微晶来解释，这些微晶作为有效的声子散射体工作。在Mg含量高于3at.%的样品的X射线衍射图和SEM图像中观察到MgCr2O4相的形成。少量Cr2O3或CuO相的形成可能是由于前体的含量与化学计量的偏差。所得结果为提高亚铬酸铜基材料的热电品质因数开辟了一个前景。

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