Some observations on the Gd-rich side of the Gd-C system

被引:10
作者
Gschneidner, KA [1 ]
Pecharsky, A [1 ]
Dennis, KW [1 ]
机构
[1] IOWA STATE UNIV,DEPT MAT SCI & ENGN,AMES,IA 50011
关键词
gadolinium-carbon system; crystal structure of Gd2C; hydrolysis of Gd-C alloys; hardness of Gd-C alloys; magnetic properties of Gd-C alloys; Curie temperature of Gd2C;
D O I
10.1016/S0925-8388(97)00146-1
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
The phase relationships at the Gd-rich end of the Gd-C system were established. The addition of C expands the lattice parameters of pure Gd, indicating that C dissolves in Gd, but the solid solubility of C is less than 2 at.% below 600 degrees C. Below 600 degrees C the 'Gd2C' phase appears to exist as a line compound, but exhibits a narrow solid solution region above this temperature. This phase is slightly C deficient, i.e., Gd2C1-x, where x=0.015 [Gd2C0.985]. 'Gd2C' has the rhombohedral C19, CdCl2-type structure with a=6.29 Angstrom and alpha=33.70 degrees. The Gd-C alloys are quite reactive in moist air, forming gaseous hydrocarbons and a white powder which flakes off of the metallic ingots, and must be handled in glove boxes. Magnetic measurements indicated that 'Gd2C' orders ferromagnetically at 350 degrees C. This is the highest known magnetic ordering temperature for any binary lanthanide compound which does not contain Fe or Co. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:107 / 110
页数:4
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