magnetic structure;
terbium nickel aluminium deuteride;
crystal structure;
metal hydride;
neutron diffraction;
D O I:
10.1016/S0925-8388(00)01034-3
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 magnetic structure of orthorhombic TbNiAID(1.1) was determined by powder neutron diffraction at 3.8 and 10 K, below the antiferromagnetic ordering temperature T-N=11 K. The unit cell is doubled in b and c directions compared to the nuclear unit cell (space group Amm2; at 3.8 K a=3.6554; b=12.3954; c=7.6316 Angstrom), and the magnetic moments are confined to the be plane with main component along c. The magnetic structure is different from TbNiAl and TbNiAID(0.3) which both have ordered magnetic moments along the corresponding a axis. The magnetic moments of Tb1 and Tb2 at 3.8 K are 6.8 and 5.7 mu(B), respectively On heating to 10 K, the type of magnetic structure is not changed, however, mu(Tb) are decreased to 2.9 mu(B) (Tb1) and 5.4 mu(B) (Tb2). (C) 2000 Elsevier Science S.A. All rights reserved.