Department of Polymer and Surface Engineering, Institute of Chemical Technology, Matunga, Mumbai, India.
Ultrason Sonochem. 2011 Sep;18(5):1128-37. doi: 10.1016/j.ultsonch.2011.03.001. Epub 2011 Mar 6.
Nanostructured zirconium dioxide was synthesized from zirconyl nitrate using both conventional and ultrasound assisted precipitation in alkaline medium. The synthesized samples were calcinated at temperatures ranging from 400°C to 900°C in steps of 100°C. The ZrO(2) specimens were characterized using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The thermal characteristics of the samples were studied via Differential Scanning Calorimetry-Thermo-Gravimetry Analysis (DSC-TGA). The influence of the calcination temperature on the phase transformation process from monoclinic to tetragonal to cubic zirconia and its consequent effect on the crystallite size and % crystallinity of the synthesized ZrO(2) was studied and interpreted. It was observed that the ultrasound assisted technique helped to hasten to the phase transformation and also at some point resulted in phase stabilization of the synthesized zirconia.
采用常规法和超声辅助沉淀法在碱性介质中由硝酸氧锆合成了纳米结构的二氧化锆。合成的样品在 400°C 至 900°C 的温度范围内以 100°C 的步幅进行煅烧。使用 X 射线衍射（XRD）和扫描电子显微镜（SEM）对 ZrO(2) 样品进行了表征。通过差示扫描量热法-热重分析（DSC-TGA）研究了样品的热特性。研究并解释了煅烧温度对从单斜相向四方相和立方相转变过程以及对合成 ZrO(2) 的晶粒尺寸和结晶度的影响。结果表明，超声辅助技术有助于加速相转变，并且在某些情况下导致合成氧化锆的相稳定。
