Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb2O5

Regina C. C. Monteiro; Andreia A. S. Lopes; Maria M. R. A. Lima; João P. B. Veiga

doi:10.1016/j.jnoncrysol.2018.03.054

Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb₂O₅

Regina C. C. Monteiro, Andreia A. S. Lopes, Maria M. R. A. Lima, João P. B. Veiga

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

23 Citations (Scopus)

Abstract

Glasses based on the molar composition 60ZnO·(40-x)B₂O₃·xSiO₂, x = 10 or 20, with small additions of Nb₂O₅ (2.5, 5, 7.5 and 10 mol%), were prepared by melt-quenching. Increasing the Nb₂O₅ content decreased the glass transition and softening temperatures. Thermal stability increased with Nb₂O₅ addition and it was higher for glasses based on the composition having the highest SiO₂ content. The thermal expansion coefficient tended to increase with the Nb₂O₅ amount. Zinc borate and zinc niobate were identified in glasses containing Nb₂O₅ ≤ 5 mol%, however in glasses based on the highest SiO₂ composition, an additional crystalline phase, willemite, was detected. At the highest Nb₂O₅ additions, willemite formation was suppressed and zinc niobate plus zinc borate were detected. The non-isothermal crystallization kinetics was investigated, and the effect of Nb₂O₅ addition and of the base glass composition on the crystallization activation energy and crystallization mechanism was discussed.

Original language	English
Pages (from-to)	124-132
Number of pages	9
Journal	Journal of Non-Crystalline Solids
Volume	491
DOIs	https://doi.org/10.1016/j.jnoncrysol.2018.03.054
Publication status	Published - 1 Jul 2018

Keywords

Glass crystallization
Niobium doped oxide glasses
Thermal properties
Zinc borosilicate glasses

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title = "Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb2O5",

abstract = "Glasses based on the molar composition 60ZnO·(40-x)B2O3·xSiO2, x = 10 or 20, with small additions of Nb2O5 (2.5, 5, 7.5 and 10 mol\%), were prepared by melt-quenching. Increasing the Nb2O5 content decreased the glass transition and softening temperatures. Thermal stability increased with Nb2O5 addition and it was higher for glasses based on the composition having the highest SiO2 content. The thermal expansion coefficient tended to increase with the Nb2O5 amount. Zinc borate and zinc niobate were identified in glasses containing Nb2O5 ≤ 5 mol\%, however in glasses based on the highest SiO2 composition, an additional crystalline phase, willemite, was detected. At the highest Nb2O5 additions, willemite formation was suppressed and zinc niobate plus zinc borate were detected. The non-isothermal crystallization kinetics was investigated, and the effect of Nb2O5 addition and of the base glass composition on the crystallization activation energy and crystallization mechanism was discussed.",

keywords = "Glass crystallization, Niobium doped oxide glasses, Thermal properties, Zinc borosilicate glasses",

author = "Monteiro, \{Regina C. C.\} and Lopes, \{Andreia A. S.\} and Lima, \{Maria M. R. A.\} and Veiga, \{Jo{\~a}o P. B.\}",

note = "This work was supported by Project M-ERA.NET/0010/2012 and by FEDER funds through the COMPETE 2020 Program and National Funds through FCT - Portuguese Foundation for Science and Technology under the project number POCI-01-0145-FEDER-007688 , Reference UID/CTM/50025. Authors thank N. Fernandes for help with the preparation of glass samples.",

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doi = "10.1016/j.jnoncrysol.2018.03.054",

language = "English",

volume = "491",

pages = "124--132",

journal = "Journal of Non-Crystalline Solids",

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TY - JOUR

T1 - Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb2O5

AU - Monteiro, Regina C. C.

AU - Lopes, Andreia A. S.

AU - Lima, Maria M. R. A.

AU - Veiga, João P. B.

N1 - This work was supported by Project M-ERA.NET/0010/2012 and by FEDER funds through the COMPETE 2020 Program and National Funds through FCT - Portuguese Foundation for Science and Technology under the project number POCI-01-0145-FEDER-007688 , Reference UID/CTM/50025. Authors thank N. Fernandes for help with the preparation of glass samples.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Glasses based on the molar composition 60ZnO·(40-x)B2O3·xSiO2, x = 10 or 20, with small additions of Nb2O5 (2.5, 5, 7.5 and 10 mol%), were prepared by melt-quenching. Increasing the Nb2O5 content decreased the glass transition and softening temperatures. Thermal stability increased with Nb2O5 addition and it was higher for glasses based on the composition having the highest SiO2 content. The thermal expansion coefficient tended to increase with the Nb2O5 amount. Zinc borate and zinc niobate were identified in glasses containing Nb2O5 ≤ 5 mol%, however in glasses based on the highest SiO2 composition, an additional crystalline phase, willemite, was detected. At the highest Nb2O5 additions, willemite formation was suppressed and zinc niobate plus zinc borate were detected. The non-isothermal crystallization kinetics was investigated, and the effect of Nb2O5 addition and of the base glass composition on the crystallization activation energy and crystallization mechanism was discussed.

AB - Glasses based on the molar composition 60ZnO·(40-x)B2O3·xSiO2, x = 10 or 20, with small additions of Nb2O5 (2.5, 5, 7.5 and 10 mol%), were prepared by melt-quenching. Increasing the Nb2O5 content decreased the glass transition and softening temperatures. Thermal stability increased with Nb2O5 addition and it was higher for glasses based on the composition having the highest SiO2 content. The thermal expansion coefficient tended to increase with the Nb2O5 amount. Zinc borate and zinc niobate were identified in glasses containing Nb2O5 ≤ 5 mol%, however in glasses based on the highest SiO2 composition, an additional crystalline phase, willemite, was detected. At the highest Nb2O5 additions, willemite formation was suppressed and zinc niobate plus zinc borate were detected. The non-isothermal crystallization kinetics was investigated, and the effect of Nb2O5 addition and of the base glass composition on the crystallization activation energy and crystallization mechanism was discussed.

KW - Glass crystallization

KW - Niobium doped oxide glasses

KW - Thermal properties

KW - Zinc borosilicate glasses

UR - https://www.scopus.com/pages/publications/85053359147

U2 - 10.1016/j.jnoncrysol.2018.03.054

DO - 10.1016/j.jnoncrysol.2018.03.054

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JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

ER -

Thermal characteristics and crystallization behavior of zinc borosilicate glasses containing Nb₂O₅

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Keywords

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