高压下Fe_XN化合物的相分解  

PHASE DECOMPOSITION OF Fe_xN COMPOUNDS UNDER HIGH PRESSURES

作　　者：魏玉年[1] 孙克[1] 冯远冰[1] 姚玉书[2] 刘世超[3] 王文魁[3] 

机构地区：[1]中国科学院物理研究所磁学开放实验室,北京100080 [2]中国科学院物理研究所超导国家重点实验室,北京100080 [3]中国科学院物理研究所,北京100080

出　　处：《高压物理学报》1992年第1期75-80,共6页Chinese Journal of High Pressure Physics

摘　　要：本文研究了室温下压力对Fe_xN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Fe_xN化合物的晶格中脱溶出来,引起相分解,形成母相与α-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Fe_xN与α-Fe的相对含量,研究了氮从Fe_xN中脱溶的动力学过程,并计算出激活体积。对于Fe_3N和Fe_4N化合物,其激活体积分别为2.24×10^-5m^3/mol和1.62×10^(-5)m^3/mol。本实验还指出,通过对Fe_xN化合物的高压处理以及适当条件下退火,可以获得Fe_(14)N_2化合物。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 nitrigen atoms preciptating from the lattice of FexN compounds, causing phase decomposition and forming parent phase and α-Fe. This phenomenon increases with increasing pressure. Dynamic process of nitrigen precipitation and the activation volume in FexN have been investiged by analysizing the relative content of α-Fe in the parent phase FexN. The activation volume of Fe3N and Fe4N are 2. 24×10-1 m3/mol and 1. 62×10-5m3/mol, respectively. The Fe16N2 compound can be obtained at appropriate condition by annealing the FexN compounds which have been compacted under high pressure.

关 键 词：相分解 氮化 高压处理 铁合金 

分 类 号：TG163.82[金属学及工艺—热处理]