Document Type

Article

Publication Date

4-17-2003

Journal or Book Title

The Journal of Physical Chemistry B

Volume

107

Issue

15

First Page

3384

Last Page

3389

DOI

10.1021/jp0267095

Abstract

A new series of anhydrous protonated chalcogenide glasses, xH2S + (1 − x)B2S3, analogous to alkali-modified glasses, have been prepared. The preparation of these glasses was carried out in multiple steps. First crystalline meta-thioboric acid, c-(HBS2)3, was prepared from vitreous boron sulfide, v-B2S3. c-(HBS2)3 was then used as a precursor for protonation to prepare a series of xH2S + (1 − x)B2S3 samples with 0.0 ≤ x ≤ 0.5. The glass formation region of this system was found to be 0.0 ≤ x ≤ 0.25. The density and glass-transition temperature (Tg) of the samples were measured. While a substantial decrease in Tg of the protonated glasses has been observed, there are insignificant changes in the density of the glasses. The IR and NMR spectra of the samples in the region 0.0 ≤ x ≤ 0.5 suggest that no tetrahedral borons are formed with the incorporation of protons. The characterization shows that these materials are unique and exhibit no borate anomaly as in the alkali-modified glasses.

Comments

Reprinted with permission from The Journal of Physical Chemistry B 107 (2003): 3384–3389, doi:10.1021/jp0267095. Copyright 2003 American Chemical Society.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

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