Paper Title:
Phase Transition in Niobophosphate Glass-Ceramic
  Abstract

Phase transition during crystallization of glass to glass-ceramic in system P2O5-CaO-Nb2O5-Na2O was studied. Several heating rates were compared – 1, 2, 5, 11 and 20°Cmin-1. DTA, XRD, FTIR and Raman analyses were performed. Niobophosphate glass-ceramic is found to form utterly different crystalline phases depending on maximal heating temperature, heating rate and time of maximal temperature maintenance. Crystallization temperatures of the same phases are strongly dependent on heating rate, while crystallinity of obtained phases is not. At lower temperatures poorly crystalline phosphates (Ca3(PO4)2, Ca10Na(PO4)7, Ca2P2O7) and niobates (NaNbO3 and Nb2O5) are identified. At higher temperatures a large amount of well crystalline niobophosphate (Na4(Nb8P4O32) and Ca2P2O7 forms. With increasing amount of Na4(Nb8P4O32), amount of NaNbO3 and Nb2O5 decreases.

  Info
Periodical
Edited by
Arturs Medvids
Pages
259-262
DOI
10.4028/www.scientific.net/AMR.222.259
Citation
A. Stunda, N. Mironova-Ulmane, N. Borodajenko, L. Berzina-Cimdina, "Phase Transition in Niobophosphate Glass-Ceramic", Advanced Materials Research, Vol. 222, pp. 259-262, 2011
Online since
April 2011
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