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ChemInform Abstract: Synthesis of the Zn7Sb2O12 by Direct Oxidation of a Precursory Alloy ( DOPA).

✍ Scribed by N. ACHARD; J.-J. COUNIOUX; A. MARCHAND; G. MARICHY

Publisher: John Wiley and Sons
Year: 2010
Weight: 31 KB
Volume: 28
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199752021

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✦ Synopsis

Synthesis of the Zn7Sb2O12 by Direct Oxidation of a Precursory Alloy ( DOPA). -The title oxide, which represents a constituent phase of ZnO-based semiconducting ceramics, is prepared by the title method. The mechanism of oxidation of the precursor alloy powder by atmospheric oxygen is studied as a function of temperature using TGA and powder XRD methods. The oxidation proceeds in three steps with formation of ZnO in the temperature range 325-685 • C, ZnSb2O4 at 685-765 . degree.C, and a grey oxide mixture at 765-780 • C. Heating of the latter at 1200 • C yields the orthorhombic β-Zn7Sb2O12 phase as white powder which upon heating at 1300 • C is transformed into the spinel-type α-Zn7Sb2O12 phase. -(ACHARD,

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