Neodymium oxide is an excellent colorant and additive with a wide range of application prospects. However, due to the obvious thermal gradient during the traditional calcination process, it is impossible to obtain particles with uniform size and morphology. A new method for preparing neodymium oxide by microwave heating of neodymium oxalate is thus proposed herein. Thermogravimetry difference scanning calorimetry (TG-DSC), x-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), laser particle size analysis, etc. were applied to investigate the changes of phase, morphology, and particle size of neodymium oxalate in the microwave field. The results revealed that neodymium oxide with complete crystal form, median diameter D₅₀ between 3.06 μm and 4.3 μm, and uniform ellipsoid morphology could be obtained by microwave heating at 900 °C for 2 h with a heating rate of 20 °C/min, thus confirming the feasibility of microwave heating for industrial production of rare-earth oxides.

氧化钕是一种优良的着色剂和添加剂，具有广泛的应用前景。然而，由于传统煅烧过程中存在明显的热梯度，无法获得尺寸和形态均一的颗粒。因此，本文提出了一种通过微波加热草酸钕制备氧化钕的新方法。应用热重差示扫描量热法(TG-DSC)、X射线衍射(XRD)分析、扫描电子显微镜(SEM)、激光粒度分析等研究草酸钕的物相、形貌和粒度变化在微波领域。结果表明，氧化钕具有完整的晶型，中值直径D ₅₀ 3.06 μm~4.3 μm之间，在900 °C下以20 °C/min的加热速率微波加热2 h可以获得均匀的椭球形貌，从而证实了微波加热在稀土氧化物工业化生产中的可行性.