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Interpretation of the Yellow Colour of Heat Treated ZnO Powder
Author(s) -
van Craeynest F.,
MaenhoutVan Der Vorst W.,
Dekeyser W.
Publication year - 1965
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19650080322
Subject(s) - zinc , reflection (computer programming) , materials science , luminescence , analytical chemistry (journal) , spectral line , intensity (physics) , absorption (acoustics) , mineralogy , chemistry , optics , metallurgy , composite material , optoelectronics , environmental chemistry , physics , astronomy , computer science , programming language
Two batches of analytical grade ZnO powder (ZnO N ) are heated to 920 °C and one, (ZnO A ), quenched to room temperature, and the other, (ZnO B ), cooled slowly. Samples of both ZnO A and ZnO B are afterwards heated for one hour at temperatures between 100 and 800 °C and quenched. From all these samples the amount of free zinc is determined and the reflection and luminescence spectra measured. The reflection spectra with ZnO N as blank indicate the presence of a supplementary absorption band having an intensity which depends upon the previous treatment. From this variation and correlation with the amount of free zinc the yellow colour of the samples can be explained and new models for the centres deduced.