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.
|Number of pages||7|
|Journal||Materials Research Bulletin|
|Publication status||Published - 2006 Mar 9|
Bibliographical noteFunding 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