Oxidation behavior of amorphous metallic Ni3(SbTe 3)2 compound

Jong Ho Jun, Jin Seung Jung, Seung Lim Oh, Yong Rok Kim, Sung Han Lee, Charles J. O'Connor

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1 Citation (Scopus)

Abstract

Amorphous Ni3(SbTe3)2 compound was prepared from a metathesis between Zintl phase K3SbTe3 and NiBr2 in solution and its oxidation behavior was investigated in the temperature range of 200-700°C in air. To characterize the sample, thermogravimetry (TG), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis by X-ray (EDAX) analyses were performed and electrical conductivity was measured as a function of temperature in the range of 25-800°C in air. The specimen showed a metallic conducting-like behavior below 585°C while a semiconducting-like behavior above 585°C. At a first oxidation step of Ni3(SbTe 3)2 below 500°C, TeO2 phase is formed. Above 500°C, NiO phase is formed, then some NiO reacts with TeO2 to form NiTeO3 and NiSb2O6 is simultaneously formed. Above 700°C, NiTeO3 is further reacted with TeO 2 to form NiTe2O5. Both NiTeO3 and NiTe2O5 are decomposed above 774°C.

Original languageEnglish
Pages (from-to)628-634
Number of pages7
JournalMaterials Research Bulletin
Volume41
Issue number3
DOIs
Publication statusPublished - 2006 Mar 9

Bibliographical note

Funding Information:
This paper was supported by Konkuk University in 2003.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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