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Structural Properties and Crystallization of Sodium Tellurite Glasses

Šantić, Ana; Moguš-Milanković, Andrea; Furić, Krešimir; Rajić Linarić, Maša; Ray, Chandra S.; Day, Delbert E. (2008) Structural Properties and Crystallization of Sodium Tellurite Glasses. Croatica Chemica Acta, 81 (4). pp. 559-567. ISSN 0011-1643

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The structural properties and crystallization behaviour of xNa(2)O-(100-x)TeO(2) (0 <= x <= 33.3, x-% mole fraction) glasses have been investigated by Raman spectroscopy. X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The Raman spectra of glasses show systematic changes in structural units. from TeO(4) trigonal bypiramids ((bps) to TeO(3) trigonal pyramids (tps) with increasing Na(2)O content in glass. These structural changes are result of Te-(eq)O(ax)-Te disruption and the formation of non-bridging oxygens (NBOs) in glass network. When heated at 623 K for 10 h glasses crystallized to different phases: alpha-TeO(2), Na(2)Te(4)O(9) and a new crystalline phase which is believed to be a polymorph of Na(2)Te(2)O(5).

Item Type: Article
Uncontrolled Keywords: tellurite glasses; structure; crystal phases; DSC; Raman spectroscopy; physical-properties; na-23 nmr; crystal-structure; raman-spectra; teo2 glass; te-125; environments; ions; na; cs
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Physics
NMR Center
Project titleProject leaderProject codeProject type
Utjecaj strukture na električna svojstva (bioaktivnih) stakala i keramike[78861] Andrea Moguš-Milanković098-0982929-2916MZOS
Fizika i primjena nanostruktura i volumne tvari[135746] Mile Ivanda098-0982904-2898MZOS
Depositing User: Ana Šantić
Date Deposited: 22 Oct 2013 08:46

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