RTU Research Information System
Latviešu English

Publikācija: Crystallization and Microstructure of Na2O–CaO–Nb2O5–P2O5 Glasses

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Crystallization and Microstructure of Na2O–CaO–Nb2O5–P2O5 Glasses
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Agnese Stunda Zujeva
Guna Krieķe
Dmitrijs Jakovļevs
Līga Bērziņa-Cimdiņa
Keywords Crystallization, microstructure, glass, clacium phosphate, niobium phosphate
Abstract Glasses in the system Na2O–CaO–Nb2O5–P2O5 were crystallized during cooling and reheating up to 900°C and crystalline phases were compared. Most of glasses showed surface nucleation, except the glass with a 10 mol% niobium content exhbited bulk nucleation. During cooling phosphates (Ca3(PO4)2, Ca2P2O7) and niobophosphates (NbPO5, NbOPO4 and Nb18P2·5O50) crystallized. Sodium niobophosphates recrystallized to Na4Nb8P4O32 or Na2Nb6P4O26 during reheating. Samples with highest amount of sodium formed more NaNbO3, samples with phosphate in excess of 35 mol% formed Na2Nb6P4O26 instead of Na4Nb8P4O32. The microstructure for all samples was inhomogeneous and contained crystallites with a large distribution of sizes.
Hyperlink: http://www.ingentaconnect.com/content/sgt/pcg/2012/00000053/00000003/art00006 
Reference Stunda-Zujeva, A., Krieķe, G., Jakovļevs, D., Bērziņa-Cimdiņa, L. Crystallization and Microstructure of Na2O–CaO–Nb2O5–P2O5 Glasses. Physics and Chemistry of Glasses: European Journal of Glass Science and Technology B, 2012, Vol.53, No.3, pp.93-98. ISSN 1753-3562. e-ISSN 1750-6689.
Additional information Citation count:
  • Scopus  0
ID 13839