New arsenides LnAgAs2 (Ln=La, Ce, Pr, Nd, Sm, Gd, Tb, Dy) and their crystal structure

被引：10
|
作者：
Demchyna, RO [1 ]
Kuz'ma, YB [1 ]
Babizhetsky, VS [1 ]
机构：
[1] Ivan Franko Natl Univ Lviv, Dept Analyt Chem, UA-79005 Lviv, Ukraine
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2001年 / 315卷 / 1-2期
关键词：
rare earth compounds; intermetallic compounds; X-ray diffraction; crystal structure;
D O I：
10.1016/S0925-8388(00)01273-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
New arsenides LnAgAs(2) (Ln=La, Ce, Pr, Nd, Sm, Gd, Tb, Dy) have been obtained by sintering of purr components, LaAgAs2 and CeAgAs2 exhibit the tetragonal HfCuSi2 type structure with space group P4/nmm. The crystal structure of CeAgAs2 has been refined using X-ray powder diffraction data (a=4.0777(2) Angstrom. c=10.5262 Angstrom, R=0.078). The LnAgAs(2) (Ln=Pr, Nd, Sm, Gd, Tb, Dy) compounds possess a crystal structure of a new type, which is an orthorhombic derivative of the HfCuSi2 type structure. The crystal structure has been refined for NdAgAs2 arsenide by X-ray powder diffraction: space group Pmmn, a=4.0121(2) Angstrom, b=4.0516(2) Angstrom, c=10.5012(5) Angstrom, R=0.0675. Structural details of the obtained compounds and their relations with known structures are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
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收藏
页码：158 / 163
页数：6
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