Crystal structure and properties of YbAg2In4 and CaAg2In4 compounds
Crystal structure and properties of YbAg2In4 and CaAg2In4 compounds
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YbAg2In4 和 CaAg2In4 化合物的晶体结构和性质
DOI：
10.1016/s0925-8388(97)00500-8
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发表时间：
1998
影响因子：
6.2
通讯作者：
R. Skolozdra
中科院分区：
文献类型：
--
作者：
L. Sysa;Y. Kalychak;Y. Galadzhun;V. Zaremba;L. Akselrud;R. Skolozdra
用单晶法测定了YbAg2In4和CaAg2In4化合物的晶体结构(DARTCH-1型自动衍射仪，石墨单色化Mo Kα辐射，θ−2θ扫描模式)。它们属于一种新的结构类型(空间群IM3，Z=24，a=1.5362(3)和1.5454(4)nm)。讨论了结构中银原子位置缺陷的特点及其与YCd6和YbCd6结构的关系。YbAg2In4化合物的磁化率在78-293K范围内服从居里-魏斯定律。化合物中的Yb原子具有中间价状态(μef=2.3μB)。CaAg2In4化合物为泡利顺磁石。所研究的化合物的电阻率在78至360K之间测量，是金属材料的特征。
The crystal structures of the YbAg2In4and CaAg2In4compounds have been determined by means of the single crystal method (DARTCH-1 automatic diffractometer, graphite-monochromatized Mo Kα radiation, θ−2θ scan mode). They belong to a new structure type (space group Im3, Z=24, a=1.5362(3) and 1.5454(4) nm, respectively). Peculiarities of the defects on the silver atom positions in the structures and their relations to the YCd6and YbCd6structures are discussed. The magnetic susceptibility of the YbAg2In4compound follows the Curie–Weiss law in the temperature range 78–293 K. The ytterbium atoms in this compound have an intermediate valence state (μeff=2.3 μB). The CaAg2In4compound is a Pauli paramagnet. The electrical resistivity of the studied compounds, measured between 78 and 360 K, is characteristic of a metallic material.