中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 16 No. 5 October 2006 |
ZHOU Zheng-you(周正有)2
（1. School of Materials Science and Engineering,
Huazhong University of Science and Technology, Wuhan 430074, China;
2. School of Materials Science and Engineering, Nanchang University,
Nanchang 330047, China;
3. College of Technology, East China Jiaotong University, Nanchang 330013, China;
4. School of Sciences, Nanchang University, Nanchang 330047, China）
Abstract: The effects of substituting stable elements of M(M=Mn, Mo, Al, V) for nonmagnetic Si and Ge on the structure and magnetic properties of Gd5Si2Ge2 were investigated by means of X-ray powder diffraction and magnetic measurements. The experimental results show that there is no effect on the structure of parent phase Gd5Si2Ge2 compound when being substituted by small amount of stable elements. The measurements of magnetic properties show that the Curie temperatures of Gd5Si2−xGe2−xM2x (M=Mn, Mo, Al and V) compounds have no obvious change before annealing, but they increase obviously with x increasing after annealing. Annealing can affect the crystalline microstructure and surface microstructure of the alloy after substitution.
Key words: Curie temperature; annealing; magnetic refrigeration; crystal structure
