Crystallization and microstructure of Na2O-CaO-Nb 2O5-P2O5 glasses

Agnese Stunda-Zujeva; Guna Krieke; Dmitrijs Jakovlevs; Liga Berzina-Cimdina

Crystallization and microstructure of Na₂O-CaO-Nb ₂O₅-P₂O₅ glasses

Agnese Stunda-Zujeva^*
, Guna Krieke
, Dmitrijs Jakovlevs
, Liga Berzina-Cimdina

^*Corresponding author for this work

Riga Technical University

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Glasses in the system Na₂O-CaO-Nb₂O ₅-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(PO ₄)₂, Ca₂P₂O₇) and niobophosphates (NbPO₅, NbOPO₄ and Nb₁₈P _{2 · 5}O₅₀) 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 Na₂Nb₆P ₄O₂₆ instead of Na₄Nb₈P ₄O₃₂. The microstructure for all samples was inhomogeneous and contained crystallites with a large distribution of sizes.

Original language	English
Pages (from-to)	93-98
Number of pages	6
Journal	Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
Volume	53
Issue number	3
Publication status	Published - Jun 2012
Externally published	Yes

Cite this

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title = "Crystallization and microstructure of Na2O-CaO-Nb 2O5-P2O5 glasses",

abstract = "Glasses in the system Na2O-CaO-Nb2O 5-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(PO 4)2, Ca2P2O7) and niobophosphates (NbPO5, NbOPO4 and Nb18P 2 · 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 Na2Nb6P 4O26 instead of Na4Nb8P 4O32. The microstructure for all samples was inhomogeneous and contained crystallites with a large distribution of sizes.",

author = "Agnese Stunda-Zujeva and Guna Krieke and Dmitrijs Jakovlevs and Liga Berzina-Cimdina",

year = "2012",

month = jun,

language = "English",

volume = "53",

pages = "93--98",

journal = "Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B",

issn = "1753-3562",

publisher = "Society of Glass Technology",

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TY - JOUR

T1 - Crystallization and microstructure of Na2O-CaO-Nb 2O5-P2O5 glasses

AU - Stunda-Zujeva, Agnese

AU - Krieke, Guna

AU - Jakovlevs, Dmitrijs

AU - Berzina-Cimdina, Liga

PY - 2012/6

Y1 - 2012/6

N2 - Glasses in the system Na2O-CaO-Nb2O 5-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(PO 4)2, Ca2P2O7) and niobophosphates (NbPO5, NbOPO4 and Nb18P 2 · 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 Na2Nb6P 4O26 instead of Na4Nb8P 4O32. The microstructure for all samples was inhomogeneous and contained crystallites with a large distribution of sizes.

AB - Glasses in the system Na2O-CaO-Nb2O 5-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(PO 4)2, Ca2P2O7) and niobophosphates (NbPO5, NbOPO4 and Nb18P 2 · 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 Na2Nb6P 4O26 instead of Na4Nb8P 4O32. The microstructure for all samples was inhomogeneous and contained crystallites with a large distribution of sizes.

UR - https://www.scopus.com/pages/publications/84865245069

M3 - Article

AN - SCOPUS:84865245069

SN - 1753-3562

VL - 53

SP - 93

EP - 98

JO - Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B

JF - Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B

IS - 3

ER -

Crystallization and microstructure of Na₂O-CaO-Nb ₂O₅-P₂O₅ glasses

Abstract

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