The development of a highly efficient and low cost production process is instrumental for the wide application of VO₂ and V₂O₃. In this paper, VO₂ and V₂O₃ powders are successfully prepared via carbothermal reduction of V₂O₅ in a flowing Ar atmosphere at 973 K and 1423 K, respectively. Compared with the traditional methods, graphite is used as a reductant, which resulted in a low cost. The experimental results show that a high temperature assists in improving the kinetic rate. The phase transformation during the low-temperature reduction process between 948 K and 973 K occurs in the following sequential order: V₂O₅→V₆O₁₃→VO₂. When the temperature is 1423 K or 1473 K, the phase transformation can be described as follows: V₂O₅→V₃O₅→V₂O₃. Owing to the shrink of the volume, the as-prepared VO₂ and V₂O₃ particles could not maintain the original micro-morphology of V₂O₅. Relative to VO₂, the as-prepared V₂O₃ particles are porous. It is also concluded that the V₂O₃ can be easily oxidized to VO₂, when the partial pressure of O₂ is in the range of 10⁻⁸ atm to 10⁻¹ atm. Therefore, a reasonable reaction temperature and reaction time are important to prepare high purity V₂O₃.

高效，低成本生产工艺的发展对于VO ₂和V ₂ O ₃的广泛应用是有帮助的。在本文中，通过在流动的Ar气氛中分别在973 K和1423 K上对V ₂ O ₅进行碳热还原，成功地制备了VO ₂和V ₂ O ₃粉末。与传统方法相比，石墨被用作还原剂，因此成本较低。实验结果表明，高温有助于提高动力学速率。在948 K和973 K的低温还原过程中的相变发生在以下顺序：V₂ O ₅ →V ₆ O ₁₃ →VO ₂。当温度为1423 K或1473 K时，相变可描述如下：V ₂ O ₅ →V ₃ O ₅ →V ₂ O ₃。由于体积的缩小，如此制备的VO ₂和V ₂ O ₃颗粒不能保持V ₂ O ₅的原始微观形态。相对于VO ₂，所制备的V ₂ O ₃颗粒是多孔的。还得出结论，V ₂当O ₂的分压在10 ^-8 atm至10 ^-1 atm的范围内时， O ₃易于被氧化为VO ₂。因此，合理的反应温度和反应时间对于制备高纯度V ₂ O ₃至关重要。