Inversion in the temperature coefficient of the optical path length close to the glass transition temperature in tellurite glasses

被引：10
|
作者：
Lima, S. M. [1 ]
Andrade, L. H. C. [1 ]
Falcao, E. A. [2 ]
Steimacher, A. [2 ]
Astrath, N. G. C. [2 ]
Medina, A. N. [2 ]
Baesso, M. L. [2 ]
Oliveira, R. C. [3 ]
Moraes, J. C. S. [3 ]
Yukimitu, K. [3 ]
Araujo, E. B. [3 ]
机构：
[1] Univ Estadual Mato Grosso Sul, Grp Espectroscopia Opt & Fototerm, BR-79804970 Dourados, MS, Brazil
[2] Univ Estadual Maringa, Grp Estudos Efeitos Fototerm, BR-87020900 Maringa, Parana, Brazil
[3] Univ Estadual Paulista, Grp Vidros & Ceram, BR-15385000 Sao Paulo, Brazil
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 25期
基金：
巴西圣保罗研究基金会;
关键词：
glass transition; lithium compounds; optical glass; tellurium compounds; thermal diffusivity; thermal lensing; thermodynamic properties; titanium compounds; THERMAL LENS SPECTROMETRY; THERMOOPTICAL PROPERTIES; FLUORIDE GLASSES; SPECTROSCOPY; RELAXATION; FRAGILITY; LIQUIDS; HEAT;
D O I：
10.1063/1.3155210
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
In this study, thermal lens spectrometry was applied to determine the thermo-optical properties of fragile tellurite glasses as a function of temperature, close to the glass transition region. The results showed an inversion from positive to negative values in the temperature coefficient of the optical path length occurring after the glass transition temperature, which is the region where structural changes from the TeO(4) trigonal bipyramidal unit to a TeO(3) trigonal pyramid containing nonbridging oxygen take place. In addition, the thermal diffusivity values as a function of temperature exhibited behaviors that were related to thermodynamic and kinetic structural changes in the glass.
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页数：3
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