高压下FexN化合物的相分解

Phase Decomposition of FexN Compounds under High Pressures

1.
Magnetic Laboratory, Institute of Physics, Academia Sinica, Beijing 100080, China;
2.
National Laboratory of Superconductivity, Institute of Physics, Academia Sinica, Beijing 100080, China;
3.
Institute of Physics, Academia Sinica, Beijing 100080, China

摘要: 本文研究了室温下压力对FexN化合物相分解的影响。X射线衍射分析表明，高压促使氮原子从FexN化合物的晶格中脱溶出来，引起相分解，形成母相与-Fe。这种相分解现象随压力增大而加强。通过分析不同压力下母相FexN与-Fe的相对含量，研究了氮从FexN中脱溶的动力学过程，并计算出激活体积。对于Fe3N和Fe4N化合物，其激活体积分别为2.2410-5 m3/mol和1.6210-5 m3/mol。本实验还指出，通过对FexN化合物的高压处理以及适当条件下退火，可以获得Fe16N2化合物。
- 相分解 /
- 高压 /
- 激活体积
Abstract: The effect of pressure on the decomposition of compounds FexN at room temperature has been investigated X-ray diffraction analysis shows that high pressure prompts nitrogen atoms precipitating from the lattice of FexN compounds, causing phase decomposition and forming parent phase and -Fe. This phenomenon increases with increasing pressure. Dynamic process of nitrogen precipitation and the activation volume in FexN have been investigated by analyzing the relative content of -Fe in the parent phase FexN. The activation volume of Fe3N and Fe4N are 2.2410-5 m3/mol and 1.6210-5 m3/mol, respectively. The Fe16N2 compound can be obtained at appropriate condition by annealing the FexN compounds which have been compacted under high pressure.
- phase decomposition /
- high pressure /
- activation volume