Structure and non-equilibrium phase diagram of the co-sputtered and post-annealed Co-ZnO system

Jun ichi Echigoya, Takashi Sato, Akira Takano, Michiko Mitsuhashi, Katsuhiko Nonaka, Yuichiro Hayasaka, Eiji Aoyagi, Masahiko Nishijima

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

X-ray diffraction, magnetic measurement and electron microscopic studies on co-sputtered Zn1-xCoxO single crystalline films showed the solubility limit to be about x = 0.58. An increase of Co greater than 0.58 resulted in the growth of Co rods elongated in the growth direction in a matrix of ZnCoO solid solution at a substrate temperature of 673 K. Above a substrate temperature of 873 K, the ZnCo2O4 spinel phase rather than the Co metal phase was seen. Annealing of as-sputtered films with a single phase of Zn1-xCoxO in air led to the decomposition of a two-phase structure of Zn1-xCoxO wurtzite and ZnCo2O4 spinel and the decrease of the solubility limit of Co in ZnO to about x = 0.2.

Original languageEnglish
Pages (from-to)64-69
Number of pages6
JournalJournal of Alloys and Compounds
Volume471
Issue number1-2
DOIs
Publication statusPublished - 2009 Mar 5

Keywords

  • Oxide materials
  • Phase diagram
  • TEM
  • Vapor deposition

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

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