Preparation and characterization of FeTiO3-Fe2O 3 solid solution system

Miki Yamashita, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Hideki Yoshikawa, Yuuji Saitoh, Shin Ichi Fujimori, Keisuke Kobayashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The ilmenite-hematite solid-solution, xFeTiO3-(1-x) α-Fe2O3 samples with x=0.7-1.0. were prepared by standard solid state reaction technique in an evaculated quartz tube. The sample pellets were heated at 1200°C for 24 hr, then furnance cooled to room temperature1. All samples consisted of a single phase of ilmenite structure. Lattice parameters of these samples estimated from the XRD patterns varied linearly with decreasing the Ti concentration on the basis of the Vegard's law. The saturating magnetization at 78 K was obtained at x=0.8 (Fe1.2Ti0.8O3), and the sample with x=0.7 (Fe1.3Ti0.7O3) was ferrimagnetic at room temperature. The carrier type measured by Seebeck coefficient was changed from p-type to n-type at about x=0.78 with decreasing the Ti concentration. Electronic states of Fe and Ti ions in FeTiO3 seemingly had the characteristic features of Fe2+ and Ti4+ respectively. However the Ti 2p→3p resonant valence band photoemission spectra of FeTiO3 had a clear density assigned to the Ti 3 d derived states. The small density appeared just below the Fermi edge was intrinsic for the FeTiO3 crystals because of identical x-ray absorption spectrum at Ti L2,3 edges between constant initial state and total electron yield mode.

Original languageEnglish
Title of host publicationElectroceramic Materials and Applications - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology
Pages505-512
Number of pages8
Publication statusPublished - Dec 1 2006
Event6th Pacific Rim Conference on Ceramic and Glass Technology - Maui, Hawaii, United States
Duration: Sep 11 2005Sep 16 2005

Publication series

NameCeramic Transactions
Volume196
ISSN (Print)1042-1122

Other

Other6th Pacific Rim Conference on Ceramic and Glass Technology
CountryUnited States
CityMaui, Hawaii
Period9/11/059/16/05

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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    Yamashita, M., Nakanishi, M., Fujii, T., Takada, J., Yoshikawa, H., Saitoh, Y., Fujimori, S. I., & Kobayashi, K. (2006). Preparation and characterization of FeTiO3-Fe2O 3 solid solution system. In Electroceramic Materials and Applications - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (pp. 505-512). (Ceramic Transactions; Vol. 196).