MAGNETIC AND CRYSTAL STRUCTURES OF TRIGONAL TB2C

被引:14
作者
ATOJI, M
机构
[1] Chemistry Division, Argonne National Laboratory, Argonne
关键词
D O I
10.1063/1.1672604
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
Neutron powder-diffraction measurements have shown that Tb2C is isostructural with Y2C, i.e., crystallizes with an anti-CdCl 2-type trigonal structure (D3d5-R3̄m), having the following crystallographic parameters in the hexagonal coordinates: the unit-cell dimensions, a = 3.595±0.006 Å and c = 18.19±0.03 Å at 300°K; three Tb2C formula units per unit cell; zTb=0.2593±0.0006; and zC=0. Tb2C becomes ferromagnetic below Tc=266±2°K. The ordered moments are directed along the trigonal caxis, and the saturation moment is 8.6±0.2 μB per Tb. The temperature variation of the ordered moment in the range 260°K<T05°K is represented by 8.6-41 -(T/T c)2] in Bohr magnetons. The ferromagnetic ordering accompanies a small-angle magnetic scattering inferring an additional ordered moment with the modulation repetition of roughly 100 Å. The maximum composite ordered moment is estimated to be about 9 μB, the value expected for the free Tb3+ ion.
引用
收藏
页码:3872 / &
相关论文
共 30 条
[1]   ON MAGNETIC STRUCTURE OF MNAU2 [J].
ATOJI, M .
PHYSICS LETTERS A, 1968, A 28 (02) :139-&
[3]   NEUTRON-DIFFRACTION STUDIES OF LA2C3, CE2C3, PR2C3, AND TB2C3 [J].
ATOJI, M ;
WILLIAMS, DE .
JOURNAL OF CHEMICAL PHYSICS, 1961, 35 (06) :1960-&
[4]   CRYSTAL STRUCTURES OF CUBIC AND TRIGONAL YTTRIUM HYPOCARBIDES - A DIMORPHICALLY INTERPHASED SINGLE-CRYSTAL STUDY [J].
ATOJI, M ;
KIKUCHI, M .
JOURNAL OF CHEMICAL PHYSICS, 1969, 51 (09) :3863-&
[5]   SLOW-NEUTRON SCATTERING CROSS SECTIONS OF TERBIUM, YTTERBIUM, AND LUTETIUM [J].
ATOJI, M .
PHYSICAL REVIEW, 1961, 121 (02) :610-&
[7]  
ATOJI M, 1968, ANL7441 REPT
[8]  
BACCHELLA GL, 1966, B SOC FR MINERAL CR, V89, P226
[9]  
BACON GE, 1962, NEUTRON DIFFRACTION, P31
[10]   NEUTRON MAGNETIC FORM FACTORS AND X-RAY ATOMIC SCATTERING FACTORS FOR RARE-EARTH IONS [J].
BLUME, M ;
WATSON, RE ;
FREEMAN, AJ .
JOURNAL OF CHEMICAL PHYSICS, 1962, 37 (06) :1245-&