New cation-deficient vanadium-iron spinels with a high vacancy content

被引：19
作者：
Gillot, B
Nivoix, V
机构：
[1] CNRS, UMR 5613, Lab Rech Reactiv Solides, F-21011 Dijon, France
[2] Univ Rouen, LASTSM, IUT, F-76821 Mont St Aignan, France
来源：
MATERIALS RESEARCH BULLETIN | 1999年 / 34卷 / 10-11期
关键词：
oxides; infrared spectroscopy; photoelectron spectroscopy; thermogravimetric analysis (TGA); X-ray diffraction;
D O I：
10.1016/S0025-5408(99)00165-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
New cation-deficient vanadium-iron spinels V(8x/(8+delta))Fe((24-8x)/(8+delta))square(3 delta/(8+delta))O(4) have been obtained by the oxidation at low temperature (<500 degrees C) of the corresponding nanosized stoichiometric spinels VxFe3-xO4 (0 less than or equal to x less than or equal to 2). The oxidation state of the cations and their distribution over both octahedral (B) and tetrahedral (A) sites were partially investigated by associating thermal analyses (differential scanning calorimetry (DSC) and differential thermogravimetric (DTG)), X-ray diffraction, and infrared and X-ray photoelectron spectroscopy. The high number of vacancies results of the Fe2+ to Fe3+ and V3+ to V5+ through V4+ ions oxidation. This one may reach 0.90 per unit formula for x = 2. (C) 2000 Elsevier Science Ltd.
引用
收藏
页码：1735 / 1747
页数：13
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