用电弧炉熔炼法制备了新的三元金属间化合物Ce5AgBi3, 用Rietveld方法对其结构进行了精修, 该化合物为Hf5CuSn3结构(空间群p63/mcm), 其中Ce、Ag和Bi分别占据Hf、Cu和Sn的位置, 晶胞参数为: a=b=9.7163(3)A, c=6.6228(2)A, V=541.47(5)A3. 该结构特点是沿着c轴方向的层状结构. 其中6g的Ce和Bi组成六边形网状平面结构, 2d的Ag和4f位置的Ce分别占据由Ce-Bi六边形所形成的沿着c轴方向的两种隧道中. 用PPMS对Ce5AgBi3的磁性和比热性能做了分析. 该化合物低温下为反铁磁性, 奈尔温度为3.8K, 高温时符合居里-外斯定律, 有效磁量子数为2.67μB, 表明其磁矩都是由Ce3+提供.
The title new compound Ce5AgBi3 was synthesized by arc melting method followed by annealing. The crystal structure refined using Rietveld method and X-ray powder diffraction data shows that it is similar to Hf5CuSn3 with space group p63/mcm (No.193). The unit cell parameters are a=b=9.7163(3)A, c=6.6228(2)A and V=541.47(5)A3. The structure is characterized by layers of Ce-Bi net formed by Ce and Bi at 6g position. Ce at 4f position and Ag at 2d position are separated in those two different kinds of Ce-Bi hexagon tunnels along c axes, respectively. Magnetism and specific heat property of Ce5AgBi3 are measured using PPMS. Ce5AgBi3 is antiferromagnetism and complies with Curie-Weiss law above TN=3.8K. The calculated moment is 2.67μB, fitted well with μeff of Ce3+，which means that the magnetism of Ce5AgBi3 is mainly offered by Ce3+.
参考文献
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