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Titanium environment in TiO2–BaO–ZnO–B2O3 glasses by x-ray absorption spectroscopy

Published online by Cambridge University Press:  31 January 2011

N. Watanabe ,
A. Y. Ramos ,
M. C. M. Alves ,
H. Tolentino ,
O. L. Alves  and
L. C. Barbosa
N. Watanabe
Affiliation:
Laboratório Nacional de Luz Síncrotron, CP 6192, 13083–970 Campinas, Brazil, and Laborato’rio de Química do Estado Sólido, Instituto de Química,UNICAMP, P.O. Box 6154, 13083–970 Campinas, Brazil
A. Y. Ramos
Affiliation:
Laboratório Nacional de Luz Síncrotron, CP 6192, 13083–970 Campinas, Brazil, and Laboratoire de Minéralogie-Cristallographie, CNRS-Paris IV, 4 place Jussieu, 75252 Paris Cedex 05, France
M. C. M. Alves
Affiliation:
Laboratório Nacional de Luz Sóncrotron, CP 6192, 13083–970 Campinas, Brazil
H. Tolentino
Affiliation:
Laboratório Nacional de Luz Sóncrotron, CP 6192, 13083–970 Campinas, Brazil
O. L. Alves
Affiliation:
Laboratório de Quimica do Estado Sólido, Instituto de Química, UNICAMP, P.O. Box 6154, 13083–970 Campinas, Brazil
L. C. Barbosa
Affiliation:
Laboratório de Materiais Vítreos, Instituto de Física Gleb Wataghin, UNICAMP, P.O. Box 6165, 13083–970 Campinas, Brazil
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Abstract

The local environment of titanium in glasses of the system TiO2–BaO–ZnO–B2O3 was studied by x-ray absorption spectroscopy. In all glasses, for TiO2 content varying from 35 to 49 mol%, the titanium atoms are mainly fourfold coordinated network formers. For the glass with the highest titanium content, about 20% of the titanium enters into a sixfold environment, indicating the presence of precrystalline nuclei. These nuclei are responsible for the decrease of the optical performance of the glass above threshold titanium content, prior to any observable crystallization.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 793 - 797
Copyright
Copyright © Materials Research Society 2000

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