Coordination number changes of tellurium and group optical basicity of ZnO–TeO2 glasses

Author： Dimitrov Vesselin   Komatsu Takayuki  

Publisher： Society of Glass Technology

ISSN： 0031-9090

Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.50, Iss.6, 2009-12, pp. : 395-398

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Abstract

The effect of local environment of tellurium atoms on the acid–base behaviour of ZnO–TeO2 glasses has been clarified through the estimation of the group basicity λ of different Te–O species from refractive index based optical basicity Λ(no) by means of their fractions in the glass structure. It has been found that group basicity decreases in the sequence: λTeO4−>λTeO40>λTeO3−>λTeO3&minus, where TeO4−, TeO40, TeO3− and TeO32− denote TeO4 unit with one nonbridging oxygen, TeO4 unit without nonbridging oxygen, terminal TeO3 unit with two nonbridging oxygens and isolated TeO3 unit with three nonbridging oxygens, respectively. Zinc tellurite glasses possess large optical basicity above 0·91 which demonstrates their basic nature. It has been proposed that the optical basicity of ZnO–TeO2 glasses decreases with increasing modifier content due to the formation of TeO3 groups in the structure which possess lower group optical basicity than that of TeO4 groups.

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