Synthesis and physical properties of Cr–P-based intermetallic compounds: Cr3P, Cr3PC, and Cr3PN
Synthesis and physical properties of Cr–P-based intermetallic compounds: Cr3P, Cr3PC, and Cr3PN
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DOI：
10.1016/j.jallcom.2015.01.051
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发表时间：
2015-05
影响因子：
6.2
通讯作者：
L. Zu;Shuai Lin;P. Tong;Jianchao Lin;X. Kan;Bosen Wang;W. Song;Yuping Sun
中科院分区：
文献类型：
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作者：
L. Zu;Shuai Lin;P. Tong;Jianchao Lin;X. Kan;Bosen Wang;W. Song;Yuping Sun
我们报道了多晶Cr 3 PX（X = C、N和空位）化合物的合成、晶体结构和电/热输运性质。因此，Cr 3 PC和Cr 3 PN具有空间群为Cmcm的斜方晶系晶体结构，而Cr 3 P则具有空间群为I−4的四方晶系结构。在2 ~ 350 K的温度范围内，所有样品都表现出良好的金属行为.同时，在低温下观察到Cr_3PC（N）（2-50 K）和Cr_3P（2-22 K）的费米液体行为。低温电阻率和比热的拟合结果表明，Cr 3 PC（N）和Cr 3 P的Kadowaki-Woods比都很大，说明所有样品都具有很强的电子-电子相关性。通过对热导率数据的分析，发现Cr 3 P的电子热导率在低温下明显强于声子热导率。至于Cr 3 PC和Cr 3 PN，然而，这两个贡献是可比的，在整个温度范围内调查。此外，在所有样品的Seebeck系数α（T）曲线中均观察到声子拖曳效应，这可能解释了Cr 3 PN的α（T）在70 K时的符号交叉现象。
We report the synthesis, crystal structures and electrical/thermal transport properties of polycrystalline Cr3PX (X = C, N, and vacancy) compounds. As a result, Cr3PC and Cr3PN have an orthorhombic crystal structure with space group Cmcm, while Cr3P shows a tetragonal structure with space group I−4. All samples show good metallic behavior between 2 and 350 K in the measurement of electrical transport. At the same time, the Fermi-liquid behavior is observed at low temperatures for Cr3PC (N) (2–50 K) and Cr3P (2–22 K). Based on the fitting results of low-temperature resistivity and specific heat, large Kadowaki–Woods ratio of Cr3PC (N) and Cr3P were obtained, suggesting a considerably strong electron–electron correlation for all our samples. By analyzing the thermal conductivity data, it is found that the electron thermal conductivity is predominantly stronger than the phonon one at low temperatures for Cr3P. As to Cr3PC and Cr3PN, however, both contributions are comparable in the whole temperature range investigated. Besides, phonon-drag effect was observed in the Seebeck coefficientα(T) curves for all the samples, which may explain the crossover of sign at 70 K inα(T) of Cr3PN.