Growth of rutile crystallites during the initial stage of anatase-to-rutile transformation in pure titania and in titania-alumina nanocomposites

Journal Article · Wed Mar 15 04:00:00 EST 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)93217-R· OSTI ID:27986

Kumar, K N P ^[1]

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1. Technical Univ. of Denmark, Lyngby (Denmark). Inst. of Mineral Industry

Anatase-to-rutile transformation in titania system is a metastable-to-stable irreversible transformation. Transformations of this type are very important both from a scientific as well as from a technological point of view. In this paper, an explanation base on the thermodynamics and kinetics of nucleation-growth type of transformations is given for the observed difference between the crystallite sizes of anatase and rutile phases during the initial stage of the phase transformation. Two situations are considered here, pure titania and the titania phase in the titania-alumina nanocomposites. It is postulated that the critical nuclei size of rutile phase may be much larger than the transforming anatase particles.

• OSTI ID: 27986
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 6 Vol. 32; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CRYSTAL GROWTH
NUCLEATION
PHASE TRANSFORMATIONS
SAMPLE PREPARATION
SOL-GEL PROCESS
TITANIUM OXIDES
X-RAY DIFFRACTION