What question did this study set out to answer?

Investigate the optical and chemical mechanisms responsible for the yellow coloration that develops in zinc oxide powder following thermal treatment.

January 1, 1965physica status solidi (b)

Interpretation of the Yellow Colour of Heat Treated ZnO Powder

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Authors

FCF. van Craeynest WVW. Maenhout‐Van Der VorstGhent University WDW. DekeyserGhent University

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Implication

Experimental study reveals how heat treatment and free zinc concentration induce yellow coloration in zinc oxide powders, suggesting new defect centre models.

Key Points

Investigate the optical and chemical mechanisms responsible for the yellow coloration that develops in zinc oxide powder following thermal treatment.
Heated analytical-grade zinc oxide powder to 920 °C, applying either rapid room-temperature quenching or slow cooling.
Subjected samples to secondary heat treatments between 100 °C and 800 °C for one hour followed by quenching.
Quantified free zinc content and evaluated reflection and luminescence spectra using unheated zinc oxide powder as a reference blank.
Reflection spectroscopy identified a supplementary absorption band whose intensity directly depended on thermal history and quenching conditions.
Supplementary absorption intensity correlated directly with measured free zinc levels, resolving the origin of the yellow color and enabling new structural models for the active defect centers.

Cite This Study

Craeynest et al. (1965) studied this question.

synapsesocial.com/papers/6a838317c5a6477db439ca30 https://doi.org/10.1002/pssb.19650080322

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Implication

Experimental study reveals how heat treatment and free zinc concentration induce yellow coloration in zinc oxide powders, suggesting new defect centre models.

Interpretation of the Yellow Colour of Heat Treated ZnO Powder

Discussion

Member takes

Implication

Key Points

Cite This Study

Interpretation of the Yellow Colour of Heat Treated ZnO Powder

Discussion

Member takes

Implication

Key Points

Cite This Study

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