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

PDF - Published Version Download (537kB)

Abstract

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
Projects:	Project title Project leader Project code Project type Utjecaj strukture na električna svojstva (bioaktivnih) stakala i keramike [78861] Andrea Moguš-Milanković 098-0982929-2916 MZOS Fizika i primjena nanostruktura i volumne tvari [135746] Mile Ivanda 098-0982904-2898 MZOS
Depositing User:	Ana Šantić
Date Deposited:	22 Oct 2013 08:46
URI:	http://fulir.irb.hr/id/eprint/819

Actions (login required)

View Item