材料科学
微晶
结构精修
煅烧
烧结
纳米颗粒
粒径
化学工程
热分解
溶胶凝胶
陶瓷
燃烧
热分析
粉末衍射
分析化学(期刊)
矿物学
冶金
结晶学
纳米技术
晶体结构
物理化学
色谱法
热的
有机化学
催化作用
化学
气象学
工程类
物理
作者
P. Manju,M. Ajith,D. Jaiswal‐Nagar
标识
DOI:10.1016/j.jeurceramsoc.2019.03.048
摘要
Citrate-nitrate sol-gel auto-combustion method, employing high purity (≈99.999%) precursors, is adopted for the synthesis of BaZrO3 nanoparticles. TGA-DSC, PXRD, SEM, TEM and BET techniques are used to explain (1) thermolysis of gel, (2) optimization of thermal parameters for phase pure BaZrO3 nanoparticles of unimodal size-distribution and (3) microstructural evolution at the sintering stage. Complexation of citrates with cations in the gel is confirmed with the help of FTIR and solid-state MAS-13C-NMR spectrometry. Dried gel undergoes self-sustained combustion and finally resulted in white colour ashes. Ashes on further calcination at 1000 °C-8 h resulted in BaZrO3 powder with an average crystallite size of 69.5 nm, as calculated by microstrain-domain size analysis of XRD of BaZrO3 using Rietveld refinement. The crystallite size is consistent with SEM and TEM particle size analysis. The powder is sintered without any sintering-aid to achieve the highest density (99%) ever reported, compared to similar processes reported earlier.
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