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Reduction of OH− ions in tellurite glasses using chlorine and oxygen gases

Published online by Cambridge University Press:  25 November 2013

Purushottam Joshi ,
Billy Richards  and
Animesh Jha
Purushottam Joshi*
Affiliation:
Department of Mechanical and Manufacturing Engineering (MME), M. S. Ramaiah School of Advanced Studies, Bengaluru 560 058, India
Billy Richards
Affiliation:
Institute for Materials Research, School of Process, Environmental and Materials Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom
Animesh Jha
Affiliation:
Institute for Materials Research, School of Process, Environmental and Materials Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Absorption losses in tellurite glasses due to OH− ions were reduced by melting the glasses under a reactive atmosphere of Cl2 + O2 gas. Incorporation of dry Cl2 + O2 gas has a major influence on the reduction of OH− species, which is found to be consistent with thermochemical data. Absorption loss due to OH− ions in bulk glasses prepared from the as-received raw materials and processed under a reactive atmosphere was 1000 and 60 dB/m, respectively. Gaussian fits have been used to identify the different species of OH− attached to the structural units present in the glass. All of the OH− species (free and bonded to Te), units can be reduced by melting the starting raw materials in a reactive atmosphere of Cl2 + O2. The net reduction in OH− absorbance at 3.2 µm was 1.1 cm−1, which is equivalent to 500 ppm. OH− reduction in tellurite glasses using O2 gas bubbling shows a reduction in the fundamental absorption band from 1.8 to 0.57 cm−1 after 75 min.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 23 , 14 December 2013 , pp. 3226 - 3233
Copyright
Copyright © Materials Research Society 2013 

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