Hits:

Indexed by:期刊论文

Date of Publication:2010-03-04

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:492

Issue:1-2

Page Number:564-569

ISSN No.:0925-8388

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

Abstract: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.