Structure of lithium tellurite and vanadium lithium tellurite glasses by high‐energy X‐ray and neutron diffraction. Issue 2 (26th March 2021)

• Record Type: Journal Article
• Authors: Hirdesh, ; Khanna, Atul; Fábián, Margit; Dippel, Ann-Christin; Gotowski, Olof
• Is Part Of: Acta crystallographica. Volume 77:Issue 2(2021)
• Page Start: 275
• Page End: 286
• Publication Date: 2021-03-26
• Subjects: tellurite glasses -- short‐range order -- medium‐range order -- vibrational spectra -- thermal properties -- Raman spectra -- high‐energy X‐ray diffraction -- neutron diffraction -- reverse Monte Carlo simulations
• DOI: 10.1107/S2052520621002274
• Languages: English
• ISSNs: 2052-5206

Abstract

Abstract : Structural and thermal properties of lithium tellurite glasses doped with vanadium are reported. Abstract : x Li2 O–(100 − x )TeO2 ( x = 20 and 25 mol%) and x V2 O5 –(25 − x )Li2 O–75TeO2 ( x = 1, 2, 3, 4 and 5 mol%) glasses were prepared by melt‐quenching and their thermal and structural properties were characterized by differential scanning calorimetry, Raman spectroscopy, high‐energy X‐ray diffraction and neutron diffraction and reverse Monte Carlo (RMC) simulations. The glass transition temperature increases steadily with an increase in V2 O5 mol% in lithium tellurite glasses due to an increase in the average single bond energy of the glass network. The X‐ray and neutron diffraction structure factors were modelled by RMC technique and the Te–O distributions show the first peak in the range 1.85–1.90 Å, with V–O = 1.75–1.95 Å, Li–O = 1.85–2.15 Å and O–O = 2.70–2.80 Å. The average Te–O coordination number decreases with an increase in Li2 O mol% in lithium tellurite glasses, and the V—O coordination decreases from 5.12 to 3.81 with an increase in V2 O5 concentration in vanadium lithium tellurite glasses. The O–Te–O, O–V–O, O–Li–O and O–O–O linkages have maxima in the ranges 86°–89°, 82°–87°, 80°–85° and at 59 o, respectively. The structural analysis of tellurite glasses reveal significant short‐range and medium‐range disorder due to the existence of a wide range of Te–O and Te–Te distances in the first coordination shell.