Morphological alteration upon phase transition and effects of oxygen impurities of chromium nanoparticles

Osamu Kido, Katsuya Kamitsuji, Mami Kurumada, Takeshi Sato, Yuki Kimura, Hitoshi Suzuki, Yoshio Saito, Chihiro Kaito

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

The morphological alteration from δ- to α-Cr nanoparticles and the phase transition temperature were directly observed by in situ experiment using a transmission electron microscope. The icositetrahedral nanoparticle of δ-Cr transformed into a rhombic dodecahedral nanoparticle of α-Cr upon heating at 550°C. It was demonstrated that the most stable shape of the α-Cr nanoparticle is the rhombic dodecahedron. Upon heating the α-Cr nanoparticle at 650°C, the (1 1 3) layer of Cr2O3 grew topotactically in the direction of [100] of α-Cr nanoparticle. We concluded that the α-Cr nanoparticle includes about 20-30 at% oxygen, as estimated from the volume of the Cr2O3 surface layer.

Original languageEnglish
JournalJournal of Crystal Growth
Volume275
Issue number1-2
DOIs
Publication statusPublished - 2005 Feb 15

Keywords

  • A1. Crystal morphology
  • A1. Impurities
  • A1. Nanostructures
  • A1. Phase equilibria
  • B1. Nanomaterials

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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