Arabczyk Walerian, Skulmowska Katarzyna, Pelka Rafał, Lendzion-Bieluń Zofia
Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave. 42, 71-065 Szczecin, Poland.
Materials (Basel). 2022 Jan 27;15(3):1006. doi: 10.3390/ma15031006.
The kinetics of nanocrystalline α-iron nitriding to γ'-iron nitride in an ammonia atmosphere was studied at 598-648 K and at atmospheric pressure. Oscillatory changes in nitriding reaction rates depending on nitrogen concentration in a solid sample were observed. This phenomenon was explained by a gradual change in the iron active surface coverage degree, with nitrogen resulting from a gradual change in the free enthalpy of nitrogen segregation. The α-Fe(N) nanocrystallites' transformation into γ'-FeN went through six metastable FeN states. The continuous function proposed by Fowler and Guggenheim was modified to a stepwise variable function.
在598 - 648K和大气压下，研究了纳米晶α-铁在氨气氛中氮化生成γ'-氮化铁的动力学。观察到氮化反应速率随固体样品中氮浓度的振荡变化。这种现象是由于铁活性表面覆盖度的逐渐变化所导致的，而氮的变化源于氮偏析自由焓的逐渐变化。α-Fe(N)纳米晶向γ'-FeN的转变经历了六个亚稳FeN状态。Fowler和Guggenheim提出的连续函数被修改为阶梯变量函数。
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