Naslov
Structural Properties and Crystallization of Sodium Tellurite Glasses

Autori
Šantić, Ana ; Moguš-Milanković, Andrea ; Furić, Krešimir ; Rajić-Linarić, Maša ; Ray, Chandra S. ; Day, Delbert E.

Izvornik
Croatica chemica acta (0011-1643) 81 (2008), 4; 559-567

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
tellurite glasses ; structure ; DSC ; Raman spectroscopy

Sažetak
The structural properties and crystallization behaviour of xNa2O-(100-x)TeO2 (0<x<33.3 mol%) 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 TeO4 trigonal bypiramids (tbps) to TeO3 trigonal pyramids (tps) with increasing Na2O content in glass. These structural changes are result of Te-O-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: alfa-TeO2, Na2Te4O9 and a new crystalline phase which is believed to be a polymorph of Na2Te2O5.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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