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At high temperatures, why does ZnO appears yellow in colour and show enhanced electrical conductivity?

April 26, 2017appears colour conductivity electrical Enhanced high temperatures Yellow zno

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At high temperatures, why does ZnO appears yellow in colour and show enhanced electrical conductivity?

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ZnO loses oxygen reversibly at high temperatures. The excess metal is accommodated interstitially; giving rise to electrons trapped in the neighborhood. It is these free electrons, which account for enhanced electrical conductivity and they also absorb white light and reflect it as yellow colour.