Lima, S. M.Catunda, T.Baesso, M. L.Vila, L. D.Messaddeq, Younes [UNESP]Stucchi, Elizabeth Berwerth [UNESP]Ribeiro, SJL2014-05-202014-05-201999-05-01Journal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 247, p. 222-226, 1999.0022-3093http://hdl.handle.net/11449/34316In this work the quantitative theoretical treatment for two beam mode mismatched thermal lens spectrometry is applied to investigate the thermo-optical properties of chalcohalide (chalcolgenides and halides mixture) glasses. For the three kinds of glass studied the thermal diffusivity varied between 2.5 and 2.7 x 10(-3) cm(2) s(-1). Using these results and supposing Dulong-Petit specific heats we estimated the thermal conductivity and temperature ratio of optical path length (ds/dT) and temperature coefficient of refractive index (dn/dT). All samples had positive ds/dT(similar to 3.3 x 10(-6) K-1) and negative dn/dT (similar to -26 x 10(-6) K-1). The difference between these parameters and the change of signal are consequences of the expansion coefficient (13 x 10(-6) K-1) and refractive index (n similar to 2.6) of chalcohalides. (C) 1999 Elsevier B.V. B.V. All rights reserved.222-226engArtigo10.1016/S0022-3093(99)00066-6WOS:000080506900039Acesso restrito299850384191781594307037142415916446047463034654