单斜晶系
立方氧化锆
材料科学
四方晶系
退火(玻璃)
纳米颗粒
结晶
溶胶凝胶
傅里叶变换红外光谱
分析化学(期刊)
晶体结构
化学工程
结晶学
纳米技术
化学
陶瓷
有机化学
复合材料
工程类
作者
A. Abu El‐Fadl,Amna M. Eltokhey,A. A. Abu-Sehley,H. M. El-Attar
标识
DOI:10.1080/01411594.2018.1545904
摘要
The synthesis of zirconia nanoparticles is achieved through a modified facile sol–gel route. The as-prepared gel is analyzed thermally using TGA and DTA techniques to spot the crystallization process of zirconia nanoparticles. The prepared gel is then annealed at different temperatures and the structure was found to change between tetragonal and monoclinic crystal systems. The first stable tetragonal phase is achieved after annealing for 2 h at 400°C. The annealed powders between 600°C and 800°C demonstrate mixed tetragonal/monoclinic phases. Annealing at 1000°C and higher temperatures up to 1200°C resulted in pure monoclinic phase. Cubic phase was not detected within the annealing temperature range in this study. The elemental analysis of the annealed powder confirmed the formation of zirconia nanoparticles with the chemical formula ZrO2. The FTIR spectra of the annealed samples introduced a variation in the vibrational bands especially around the phase transition temperature. HR-TEM images reported the formation of nano-zirconia crystals with apparently large particle sizes. The optical energy gap of zirconia nanoparticles is investigated and determined.
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