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论文类型：期刊论文

发表时间：2010-03-04

发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物：SCIE、EI、Scopus

卷号：492

期号：1-2

页面范围：564-569

ISSN号：0925-8388

关键字：Nanostructured materials; Sol-gel processes; Crystal structure; X-ray diffraction; Transmission electron microscopy

摘要：Stearic acid gel is employed to study the phase evolution of MgTiO3 nanoparticles by thermal gravimetric analysis, X-ray diffraction, and Fourier transform infrared. During the preparation of stearic acid gel, tetrabutyl titanate easily absorbed moisture to hydrolyze into Ti(OH)(4) firstly, and then reacts with stearic acid and magnesium stearate to form magnesium-titanium oxide network polymer gel, meanwhile n-butanol is generated. When stearic acid gel is calcined in air, a series of oxidation and combustion reactions occur, meanwhile apparent heat is given off. The results show that a metastable intermediate phase Mg2TiO4 is generated at 450 degrees C and nearly disappeared at 550 degrees C. Simultaneously, a new solid phase of MgTiO3 appears. The metastable intermediate phase Mg2TiO4 is successfully identified in the current work. (C) 2009 Elsevier B.V. All rights reserved.