Abstract The resistivity of metal materials usually increases as the temperature rises and the temperature coefficient of resistivity (TCR) could be a few thousand (ppm/K). In fact, this would cause trouble to the accurate measuring instrument used in varying temperature conditions. Thus, it is a great challenge to develop materials with a low-temperature coefficient of resistivity (L-TCR). In this paper, we synthesized LaFe13-xSix compounds showing L-TCR behavior. The X-ray powder diffraction (XRD) patterns revealed that the crystal structure of LaFe13-xSix compounds changes from a cubic structure to a tetragonal structure as the Si component rises, and new phases like LaSi2 and FeSi appear. By testing electrical property, we find that the local extremum of the TCR is obtained in LaFe5Al8 compound, which is −54.4 ppm/K over 5–300 K.

中文翻译：

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LaFe13-xSix 化合物的低温电阻系数

摘要 金属材料的电阻率通常随着温度的升高而增加，电阻率温度系数（TCR）可达几千（ppm/K）。事实上，这会给在不同温度条件下使用的精确测量仪器带来麻烦。因此，开发具有低电阻率温度系数（L-TCR）的材料是一个巨大的挑战。在本文中，我们合成了显示 L-TCR 行为的 LaFe13-xSix 化合物。X 射线粉末衍射 (XRD) 图案显示，随着 Si 组分的增加，LaFe13-xSix 化合物的晶体结构从立方结构变为四方结构，并出现了新相，如 LaSi2 和 FeSi。通过测试电性能，我们发现在 LaFe5Al8 化合物中获得了 TCR 的局部极值，在 5-300 K 范围内为 -54.4 ppm/K。