Thermodynamic and kinetic study of the synthesis of mixed-valence V4O7 via oxidation in designed quench system with atmospheric control
作者： Yue Wang , Haiyuan Hou , Fan Li , Baijun Yan , Aiju Xu
DOI: 10.1016/J.JALLCOM.2019.06.386
关键词: Kinetic energy 、 Surface-area-to-volume ratio 、 Materials science 、 Controlled atmosphere 、 Phase stability 、 Raw material 、 Thermodynamics 、 Partial pressure 、 Valence (chemistry)
摘要: Abstract The phase stability diagram of the V–O Magneli system was established based on a previous work, and designed quench applied to experimental investigation examine presented thermodynamic data. This equipment can bring sample set temperature in several minutes it room under controlled atmosphere. atmosphere is by setting volume ratio CO2/H2 300, which evaluated calculations. By tuning temperature, oxygen partial pressure be adjusted across regions different stable phases. V2O3 used as raw material for oxidation gas mixture at equilibrium temperatures 1323, 1373, 1423, 1473 1523 K. XRD results quenched samples from equilibriums series verified considerations. When connected balance, conversion curves were obtained during last 300 min at 1473 K. complete V4O7 proceeds via two reactions: one V3O5 other V4O7. Fitting showed that both reactions obey first-order Avrami–Erofeev equation but with parameters.
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