EFFECT OF DEFORMATION ON PD2MNSN HEUSLER ALLOY STUDIED WITH TRANSMISSION ELECTRON-MICROSCOPY, PROFILE ANALYSIS OF NEUTRON POWDER DIFFRACTION PATTERN, AND MAGNETIZATION MEASUREMENT

被引:14
作者
KAMIYAMA, T
SHINOHARA, T
TOMIYOSHI, S
MINONISHI, Y
YAMAMOTO, H
ASANO, H
WATANABE, N
机构
[1] TOHOKU UNIV,INST MAT RES,SENDAI,MIYAGI 980,JAPAN
[2] NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN
关键词
D O I
10.1063/1.346128
中图分类号
O59 [应用物理学];
学科分类号
摘要
The ferromagnetic Heusler alloy Pd2MnSn shows large reduction in magnetization by cold working, without any appreciable change in the Curie temperature. In order to clarify the relationship between the reduction and the defect structure in Pd2MnSn, transmission electron microscopic observation, high-resolution neutron powder diffraction, and magnetization studies have been performed. In the deformed Pd2MnSn sample, dislocations are distributed inhomogeneously and form a cell structure. In the cell walls, a large amount of antiphase domain boundaries exist. A method of Rietveld refinement has been proposed for analyzing the powder neutron diffraction patterns of the cold-worked sample, where all the contributions of defects (size, strain, and antiphase domain boundary) and the instrumental resolution to each reflection line are expressed in terms of Fourier coefficients, and inverse Fourier transforms of those product represent the calculated profile which is used for least-squares refinement. Analyzing the experimental data with the method proposed, it is concluded that the reduction in magnetization in the deformed Pd2MnSn is due to an increase in the number of small antiphase domains which couple antiferromagnetically to each other.
引用
收藏
页码:4741 / 4750
页数:10
相关论文
共 33 条
  • [11] Kamiyama T., 1984, Praktische Metallographie, V21, P417
  • [12] KAMIYAMA T, 1985, PHILOS MAG A, V52, pL43, DOI 10.1080/01418618508242134
  • [13] KAMIYAMA T, 1987, 1987 P INT S PHYS MA, P579
  • [14] KAMIYAMA T, 1986, KENS REP, V6, P113
  • [15] LANGFORD JI, 1980, US DEP COMMER NBS SP, V567, P255
  • [16] A NEW STUDY OF THE STRUCTURE OF LANI5D6.7 USING A MODIFIED RIETVELD METHOD FOR THE REFINEMENT OF NEUTRON POWDER DIFFRACTION DATA
    LARTIGUE, C
    LEBAIL, A
    PERCHERONGUEGAN, A
    [J]. JOURNAL OF THE LESS-COMMON METALS, 1987, 129 : 65 - 76
  • [17] MIURA S, 1968, INT C VACANCY INTERS, V1, P429
  • [18] DIFFRACTION FROM PLANAR FAULTS IN BETA-BRASS-TYPE ORDERED STRUCTURES
    MOHANTY, GP
    SCHMIDT, RA
    [J]. JOURNAL OF APPLIED PHYSICS, 1970, 41 (09) : 3573 - &
  • [19] RADO GT, 1966, MAGNETISM
  • [20] ROTHMAN RL, 1969, ADVAN XRAY ANAL, V12, P208