@article{10902/35045,
year = {2015},
month = {12},
url = {https://hdl.handle.net/10902/35045},
abstract = {The effects of addition of Al3+,W6+,Nb5+and Pb2+on the density, thermal, optical properties of borotellurite glasses and on the B–O, Te–O and Al–O speciation are studied. Density maximizes in glasses containing Pb2+ and minimizes in glasses with Al3+. The optical absorption cut-off wavelength increases with the addition of heavy metal ions while Al3+shifts it to lower wavelengths. W6+,Nb5+and Al3+strengthen the borotellurite networkandenhancetheglasstransition temperatures,however Pb2+decreases it.Theglasstransition temperature isa linearfunction oftheaveragesinglebondenergyoftheglassnetwork.11BMagicAngleSpinning(MAS) Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared studies found that the BO4 structural units are unstable in thepresenceof Al3+ , W6+andNb5+,howeverPb2+hasanoppositeeffectandpromotestheformation of BO4. 27Al MAS NMR showedthat alumino-borotellurite glasses contain AlO6,AlO5 and AlO4 structural units whoserelative concentrations depend onalumina mol%. RamanspectroscopywasusedtodetermineTe–O coordination in glasses, the later decreased on adding metal ions and Al3+produced a maximum suppression of TeO4 units.},
organization = {Nirmal Kaur thanks University Grants Commission (UGC), New Delhi, India for research fellowship. Atul Khanna acknowledges UGC-DAE-Consortium for Scientific Research, Mumbai, India for a research grant.},
publisher = {Elsevier},
publisher = {Journal of Non-Crystalline Solids, 2015, 429, 153–163},
title = {Effects of Al3+,W6+,Nb5+and Pb2+on the structure and properties of borotellurite glasses},
author = {Kaur, Nirmal and Khanna, Atul and González Barriuso, Marina and González Martínez, Fernando and Chen, Banghao},
}