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Publikācija: Phase Transition in Niobophosphate Glass-Ceramic

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Nosaukums oriģinālvalodā Phase Transition in Niobophosphate Glass-Ceramic
Pētniecības nozare 2. Inženierzinātnes un tehnoloģijas
Pētniecības apakšnozare 2.5. Materiālzinātne
Autori Agnese Stunda Zujeva
Ņina Mironova-Ulmane
Natālija Borodajenko
Līga Bērziņa-Cimdiņa
Atslēgas vārdi glass, crystalliztion, phosphate, niobate
Anotācija 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 20ºCmin-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.
DOI: 10.4028/www.scientific.net/AMR.222.259
Hipersaite: http://www.scientific.net/AMR.222.259 
Atsauce Stunda-Zujeva, A., Mironova-Ulmane, Ņ., Borodajenko, N., Bērziņa-Cimdiņa, L. Phase Transition in Niobophosphate Glass-Ceramic. Advanced Material Research , 2011, Vol.222: Global Research and Education, 259.-262.lpp. ISSN 1022-6680. Pieejams: doi:10.4028/www.scientific.net/AMR.222.259
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