Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations

Y. Domori, T. Nanba, Y. Miura, S. Sakida

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

Abstract

It was confirmed that the divalent cations, Zn2+ and Cu 2+ were electrochemically inserted into amorphous WO3 films prepared by r.f.-magnetron sputtering method. Coloration of the films was also observed, and the films were, however, bleached gradually. The bleaching mechanism was discussed based on the ab-initio molecular orbital calculations, in which Li+ or Zn2+ ions were introduced into the WO 3 frameworks. In the case of Zn insertion, electrons were trapped in a non-bonding Zn 4s orbital just below the conduction band. It was finally concluded that in the films with distorted WO3 frameworks, Zn 4s orbital was mingled in the conduction band and electrons were free to be transferred between W6+ and W5+. As the structural relaxation progressed, electrons were gradually trapped in Zn 4s orbital, and the films were finally bleached.

Original languageEnglish
Title of host publicationElectroceramic Materials and Applications - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology
Pages491-496
Number of pages6
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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    Domori, Y., Nanba, T., Miura, Y., & Sakida, S. (2006). Coloration and bleaching phenomena of amorphous WO3 films due to the electrochemical insertion of divalent cations. In Electroceramic Materials and Applications - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology (pp. 491-496). (Ceramic Transactions; Vol. 196).