Preparation and characterization of nanocrystalline doped TiO2

Sergei V. Zaitsev, Jooho Moon, Hiroyoshi Takagi, Masanobu Awano

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13 Citations (Scopus)

Abstract

Nanocrystalline TiO2 powders, doped in range of 0.05-5 mol% Nb and Ta, have been prepared using a chemical method. Synthesized powders have an anatase crystal structure and a fine particle size of 10-20 nm. Energy-dispersive X-ray microanalysis shows uniform dopant distribution in the powder. Temperature dependence of resistivity for both the Nb- and Ta-doped TiO2 sintered at 1300°C exhibits n-type conductivity in the range 100-500°C with an activation energy of about 0.2 eV. It was found by transmission electron microscope analysis that the dopants in the doped TiO2 sintered samples are segregated on grain boundaries after repeated high temperature treatment regardless of doping ranges. Addition of Zr in small amount (about 1 wt%) sufficiently suppresses such phase segregation, improving the high temperature stability.

Original languageEnglish
Pages (from-to)211-220
Number of pages10
JournalAdvanced Powder Technology
Volume11
Issue number2
DOIs
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanics of Materials

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