Crystal structure of tetragonal Ce11B2C2

Crystal structure of tetragonal Ce11B2C2
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四方晶系Ce11B2C2的晶体结构

DOI:
10.1016/s0022-3697(99)00156-0
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发表时间:
1999
影响因子:
4
通讯作者:
Y. Yamaguchi
Y. Yamaguchi
中科院分区:
材料科学3区
文献类型:
--
作者:
T. Onimaru;H. Onodera;K. Ohoyama;H. Yamauchi;M. Ohashi;Y. Yamaguchi

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由于CeB_2C_2的晶体结构仅用X射线技术检验过,而且B和C原子在该化合物中的位置是可疑的,因此进行了中子粉末衍射实验以确定Ce_(11)B_2C_2的晶体结构。中子衍射结果表明,Ce 11 B2 C2的晶体结构具有P4/mbm空间群对称性,其中Ce原子占据2(a)位(0,0,0),B和C原子占据4(h)位(x,x+0.5,0.5),位置参数为x B =0.361(1),x C =0.160(1)。
Neutron powder diffraction experiments were performed in order to determine the crystal structure of Ce11B2C2, since the structure of CeB2C2has been examined only by X-ray techniques and the positions of the B and C atoms in this compound are suspicious. The neutron diffraction pattern reveals that the crystal structure of Ce11B2C2has a symmetry with the space group of P4/mbm, where the Ce atoms occupy the 2(a) sites (0,0,0) and the B and C atoms 4(h) sites (x,x+0.5,0.5) with positional parameters of xB=0.361(1) and xC=0.160(1) at 15.0K.