, Volume 5, Issue 5–6, pp 335–344 | Cite as

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

  • E. Cazzanelli
  • G. Mariotto
  • C. Vinegoni
  • A. Kuzmin
  • J. Purans


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.


Tungsten Milling Structural Transformation Mechanical Treatment Raman Band 
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Copyright information

© IfI - Institute for Ionics 1999

Authors and Affiliations

  • E. Cazzanelli
    • 1
  • G. Mariotto
    • 2
  • C. Vinegoni
    • 3
  • A. Kuzmin
    • 4
  • J. Purans
    • 4
  1. 1.Istituto Nazionale per la Fisica della Materia and Dipartimento di FisicaUniversità della CalabriaArcavacata di Rende (Cosenza)Italy
  2. 2.Istituto Nazionale per la Fisica della Materia and Dipartimento di FisicaUniversità di TrentoTrentoItaly
  3. 3.Dept. of Physics, GAP OptiqueUniversity of GenevaGenevaSwitzerland
  4. 4.Institute of Solid State PhysicsRigaLatvia

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