TY - JOUR
T1 - Effect of [SiO2]/[Li2O] on the microstructure and properties of lithium disilicate glass-ceramics containing lithium tantalate as a secondary phase
AU - DeCeanne, Anthony V.
AU - Dittmer, Marc
AU - Ritzberger, Christian
AU - Rampf, Markus
AU - Mauro, John C.
N1 - Funding Information:
The authors would like to thank Ivoclar Vivadent AG for funding in support of this research. We also would like to thank the scientists of the materials characterization lab at Pennsylvania State University for help with collecting measurements.
Publisher Copyright:
© 2022
PY - 2022/11/1
Y1 - 2022/11/1
N2 - Our previous work proposed a phase reaction equation for the current lithium disilicate (LD) glass-ceramic system containing lithium tantalate (LT) as a secondary phase: 2(Li2SiO3) + Ta2O5 → Li2Si2O5 + 2(LiTaO3). The present study had a goal of finding support for the proposed equation by examining the effect of the ratio of [SiO2] to [Li2O] on the phase assemblage and microstructure of this system. The study also examined the microstructural effects on several properties of this system. A 15-sample data set was created by designing three microstructures for each of the five compositions. It was found that the LT/LD ratio from X-ray diffraction peak counts, as well as from Rietveld refinement, increased in the material as [SiO2]/[Li2O] decreased, supporting the proposed reaction equation. As [SiO2]/[Li2O] decreased, bulk density and CTE increased, while L* (lightness vs darkness) and Knoop hardness values decreased. The microstructure had little effect on radiopacity, but the addition of extra Ta2O5 into the composition lead to increased radiopacity values.
AB - Our previous work proposed a phase reaction equation for the current lithium disilicate (LD) glass-ceramic system containing lithium tantalate (LT) as a secondary phase: 2(Li2SiO3) + Ta2O5 → Li2Si2O5 + 2(LiTaO3). The present study had a goal of finding support for the proposed equation by examining the effect of the ratio of [SiO2] to [Li2O] on the phase assemblage and microstructure of this system. The study also examined the microstructural effects on several properties of this system. A 15-sample data set was created by designing three microstructures for each of the five compositions. It was found that the LT/LD ratio from X-ray diffraction peak counts, as well as from Rietveld refinement, increased in the material as [SiO2]/[Li2O] decreased, supporting the proposed reaction equation. As [SiO2]/[Li2O] decreased, bulk density and CTE increased, while L* (lightness vs darkness) and Knoop hardness values decreased. The microstructure had little effect on radiopacity, but the addition of extra Ta2O5 into the composition lead to increased radiopacity values.
UR - http://www.scopus.com/inward/record.url?scp=85135381056&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85135381056&partnerID=8YFLogxK
U2 - 10.1016/j.jnoncrysol.2022.121834
DO - 10.1016/j.jnoncrysol.2022.121834
M3 - Article
AN - SCOPUS:85135381056
SN - 0022-3093
VL - 595
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 121834
ER -