Color centres and polymorphism in pure WO3 and mixed (1−x)WO3−y·xReO2 powders

被引：0
|
作者：
E. Cazzanelli
G. Mariotto
C. Vinegoni
A. Kuzmin
J. Purans
机构：
[1] Università della Calabria,Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica
[2] Università di Trento,Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica
[3] University of Geneva,Dept. of Physics, GAP Optique
[4] Institute of Solid State Physics,undefined
来源：
Ionics | 1999年 / 5卷
关键词：
Tungsten; Milling; Structural Transformation; Mechanical Treatment; Raman Band;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The relationship between structural transformations and colour centres creation is discussed for deeply coloured hydrogen tungsten bronzes and for pure WO3 powders, acquiring less intense colour after mechanical treatments of variable duration. A comparative study on coloration is made also for mixed compounds (1−x)WO3−y·xReO2, where an evidence of a resonance effect for a particular Raman band at 970 cm−1, attributed to the color centres, is observed. Besides, it is found that even moderate milling treatments result in a quite different structural evolution of tungsten trioxide upon cooling.
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页码：335 / 344
页数：9
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