Synthesis and characterization of Ge–Cr-based intermetallic compounds: GeCr3, GeCCr3, and GeNCr3
作者:S. Lin、P. Tong、B.S. Wang、Y.N. Huang、W.H. Song、Y.P. Sun
DOI:10.1016/j.jallcom.2013.09.086
日期:2014.1
We report the synthesis of GeCr3, GeCCr3, and GeNCr3 polycrystalline compounds, and present a systematic study of this series by the measurements of X-ray diffraction (XRD), magnetism, electrical/thermal transport, specific heat, and Hall coefficient. Good quality of our samples is verified by quite small value of residual resistivity and considerably large residual resistivity ratio. Based on the Rietveld refinement of XRD data, the crystallographic parameters are obtained, and, correspondingly, the sketches of crystal structure are plotted for all the samples. The ground states of GeCr3, GeCCr3, and GeNCr3 are paramagnetic/antiferromagnetic metal, and even a Fermi-liquid behavior is observed in electrical transport at low temperatures. Furthermore, the analysis of the thermal conductivity data suggests the electron thermal conductivity plays a major role in total thermal conductivity for GeCr3 at low temperatures, while the phonon thermal conductivity is dominant for GeCCr3 and GeNCr3 at high temperatures. The negative value of Seebeck coefficient and Hall coefficient indicate that the charge carriers are electron-type for GeCr3, GeCCr3, and GeNCr3. (C) 2013 Elsevier B. V. All rights reserved.