Electrical Properties and Thermal Expansion of the Laves Phases, CaMg2 and MgCu2
Electrical Properties and Thermal Expansion of the Laves Phases, CaMg2 and MgCu2
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DOI：
10.1063/1.1722986
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发表时间：
1958-11
影响因子：
3.2
通讯作者：
J. Smith;J. Ogren
中科院分区：
文献类型：
--
作者：
J. Smith;J. Ogren
在六方晶系CaMg 2单晶和立方晶系MgCu 2多晶上测量了电阻率、电阻率温度系数和霍尔系数。测量值的大小落在金属中通常观察到的范围内。相比之下，热膨胀系数的测量值略高于在金属元件中观察到的值。观察到不同样品上测量的结晶度的明显分散，推测是由于结晶完整程度的变化。对于CaMg 2的测量霍尔系数和电阻率和热膨胀的温度系数只显示出很小程度的各向异性。霍尔系数的符号被认为是积极的CaMg 2和负的MgCu 2，这是与以前的测量磁化率MgCu 2及其合金。
Electrical resistivities, temperature coefficients of resistivity, and Hall coefficients have been measured on single crystals of hexagonal CaMg2 and on polycrystals of cubic MgCu2. The magnitudes of the measured values fall in the range normally observed in metals. In contrast, measured values for the coefficients of thermal expansion are slightly higher than those observed in metallic elements. Appreciable scatter in measured resistivities on different specimens was observed and is presumably due to variations in the degree of crystalline perfection. For CaMg2 the measured Hall coefficients and the temperature coefficients of resistivity and of thermal expansion show only a small degree of anisotropy. The sign of the Hall coefficients was found to be positive for CaMg2 and negative for MgCu2; this is consistent with previous measurements of magnetic susceptibility made on MgCu2 and its alloys.