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Kaseman DC, Hung I, Lee K, et al. Tellurium speciation, connectivity, and chemical order in As(x)Te(100-x) glasses: results from two-dimensional 125Te NMR spectroscopy. J Phys Chem B. 2015;119(5):2081-8doi: 10.1021/jp5123618.
Kaseman, D. C., Hung, I., Lee, K., Kovnir, K., Gan, Z., Aitken, B., & Sen, S. (2015). Tellurium speciation, connectivity, and chemical order in As(x)Te(100-x) glasses: results from two-dimensional 125Te NMR spectroscopy. The journal of physical chemistry. B, 119(5), 2081-8. https://doi.org/10.1021/jp5123618
Kaseman, Derrick C, et al. "Tellurium speciation, connectivity, and chemical order in As(x)Te(100-x) glasses: results from two-dimensional 125Te NMR spectroscopy." The journal of physical chemistry. B vol. 119,5 (2015): 2081-8. doi: https://doi.org/10.1021/jp5123618
Kaseman DC, Hung I, Lee K, Kovnir K, Gan Z, Aitken B, Sen S. Tellurium speciation, connectivity, and chemical order in As(x)Te(100-x) glasses: results from two-dimensional 125Te NMR spectroscopy. J Phys Chem B. 2015 Feb 05;119(5):2081-8. doi: 10.1021/jp5123618. Epub 2015 Jan 27. PMID: 25584635.
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J Phys Chem B. 2015 Feb 05;119(5):2081-8. doi: 10.1021/jp5123618. Epub 2015 Jan 27.

Tellurium speciation, connectivity, and chemical order in As(x)Te(100-x) glasses: results from two-dimensional 125Te NMR spectroscopy.

The journal of physical chemistry. B

Derrick C Kaseman, Ivan Hung, Kathleen Lee, Kirill Kovnir, Zhehong Gan, Bruce Aitken, Sabyasachi Sen

Affiliations

  1. Division of Materials Science, University of California at Davis , Davis, California 95616, United States.

PMID: 25584635 DOI: 10.1021/jp5123618

Abstract

The short-range structure, connectivity, and chemical order in As(x)Te(100-x) (25 ≤ x ≤ 65) glasses are studied using high-resolution two-dimensional projection magic-angle-turning (pjMAT) (125)Te nuclear magnetic resonance (NMR) spectroscopy. The (125)Te pjMAT NMR results indicate that the coordination of Te atoms obeys the 8-N coordination rule over the entire composition range. However, in strong contrast with the analogous glass-forming As-S and As-Se chalcogenides, significant violation of chemical order is observed in As-Te glasses over the entire composition range in the form of homopolar As-As (Te-Te) bonds, even in severely As (Te)-deficient glasses. The speciation of the Te coordination environments can be explained with the dissociation reaction model As2Te3 → 2As + 3Te(II), characterized by a dissociation constant that is independent of glass composition. These structural characteristics can be attributed to the high metallicity of Te and the strong energetic similarity between the Te-Te, Te-As, and As-As bonds, and they are consistent with the monotonic and often nearly linear variation of physical properties observed in telluride glasses as a function of the Te content.

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