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Journal of Materials Science

, Volume 28, Issue 17, pp 4660–4666 | Cite as

Crystalline transformation of Ti-B-O, Al-Ti-B-O, Si-Ti-B-O and Al-Si-Ti-B-O by thermal treatments

  • H. Asaoka
Papers

Abstract

The thermal transformations of Ti-B-O, Al-Ti-B-O, Si-Ti-B-O and Al-Si-Ti-B-O have been investigated using the methods of thermal analysis and X-ray powder diffraction. The materials are a crystalline series of TiO2 with partial replacement of titanium by the elements, aluminium, boron and silicon. The anatase form of the materials was transformed to the rutile form at 520∼680 °C for Ti-B-O, 880∼950 °C for Al-Ti-B-O, 1080∼1280 °C for Si-Ti-B-O and 1180∼1330 °C for Al-Si-Ti-B-O. The rate constant for the anatase-rutile transformation of Ti-B-O was 6.908×10−3 min−1 under isothermal conditions at 680 °C. Analysis of the kinetic data obtained by differential thermal analysis (DTA) gave the activation energy for transformation of anatase into rutile as 663.7 Kcal mol−1 for Al-Ti-B-O. The lattice parameters for the compounds studied at various temperatures were calculated by least-squares fitting of the X-ray powder diffraction data.

Keywords

TiO2 Titanium Activation Energy Boron Rutile 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • H. Asaoka
    • 1
  1. 1.Division of Chemistry, General Education DepartmentNiigata UniversityNiigataJapan

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