A redox reaction between fine particulate Al and TiO2·nH2O during milling

Y. Kojima, T. Isobe, M. Senna, T. Shinohara, S. Ono, K. Sumiyama, K. Suzuki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A process of complex formation between fine particulate Al and titania hydrogel during milling is examined with reference to a similar process between two hydrogels, Al(OH)3 and TiO2 H2O. One of the most typical features for the present system is the redox reaction, where metallic Al atoms are coupled with oxygen to form ordinary AlO6 units via an intermediate 5-coordinated states, as detected by high resolution 27Al solid state NMR. Ti3+ ions were detected by ESR. The amount of these bivalent ions increased with milling time but leveled off on prolonged milling. A thermit reaction was detected by thermal analyses of the mixture after prolonged milling. At the same time, a highly polarized OH bond was formed during milling, as detected by solid state proton NMR, serving as a hinge to link aluminum and titanium atoms, leading to a precursor of Al2TiO5. Local inhomogeneity in an atomic scale, as detected from a detailed analysis of 27Al is typical and unavoidable for materials prepared via a mechanical route.

Original languageEnglish
Pages (from-to)569-574
Number of pages6
JournalMaterials Science Forum
Volume225-227
Issue numberPART 1
Publication statusPublished - 1996 Jan 1

Keywords

  • AlTiO
  • OH Groups. Local Inhomogeneity
  • Redox Reaction
  • Solid State NMR

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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