VO2 (A): Reinvestigation of crystal structure, phase transition and crystal growth mechanisms

Srinivas Popuri, Alla Artemenko, Christine Labrugere, Marinela Miclau, Antoine Villesuzanne, Michaël Pollet

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Well crystallized VO2 (A) microrods were grown via a single step hydrothermal reaction in the presence of V2O5 and oxalic acid. With the advantage of high crystalline samples, we propose P4/ncc as an appropriate space group at room temperature. From morphological studies, we found that the oriented attachment and layer by layer growth mechanisms are responsible for the formation of VO2 (A) micro rods. The structural and electronic transitions in VO2 (A) are strongly first order in nature, and a marked difference between the structural transition temperatures and electronic transitions temperature was evidenced. The reversible intra- (LTP-A to HTP-A) and irreversible inter- (HTP-A to VO2 (M1)) structural phase transformations were studied by in-situ powder X-ray diffraction. Attempts to increase the size of the VO2 (A) microrods are presented and the possible formation steps for the flower-like morphologies of VO2 (M1) are described.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalJournal of Solid State Chemistry
Volume213
DOIs
Publication statusPublished - May 2014

Keywords

  • Crystal growth
  • Hydrothermal synthesis
  • Structural and electronic transitions
  • Vanadium dioxide polymorphs
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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