Growth and morphology of W18O49 crystals produced by microwave decomposition of ammonium paratungstate

J. Pfeifer, E. Badaljan, P. Tekula-Buxbaum, T. Kovács, O. Geszti, A. L. Tóth, H. J. Lunk

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

By microwave irradiation of ammonium paratungstate (APT, (NH4)10H2W12O 42·4H2O), needle crystals of W18O49 with a wide variety of size and morphology were formed. Their sizes and morphologies varied depending on various facets of individual APT pseudomorphous particles on which whiskers were grown, and among neighbouring decomposed APT pseudomorphous particles. Based on scanning electron and transmission electron-microscopic observations, it has been concluded that individual whiskers were monocrystalline and grew by a root growth mechanism from a nucleus formed in the amorphous layer, and that a rapid leader-like whisker growth in length was followed by a subsequent slower growth in thickness. Any evidence supporting a screw dislocation mechanism or tip growth by vapour-liquid-solid have not been detected.

Original languageEnglish
Pages (from-to)727-733
Number of pages7
JournalJournal of Crystal Growth
Volume169
Issue number4
DOIs
Publication statusPublished - Dec 1 1996

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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