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Thermal properties and thermodynamic model of lithium doped 45S5 bioglass
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Thermal properties and thermodynamic model of lithium doped 45S5 bioglass
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Journal Article
Thermal properties and thermodynamic model of lithium doped 45S5 bioglass
2024
Overview
Shakhmatkin and Vedishcheva thermodynamic model (SV TDM) of the 45S5 Bioglass® doped with three different amounts of Li
2
O (4.1, 9.9, and 12.3 mol%) was evaluated at T = 800 K. The 55 components of SV TDM were considered, among them 12 lithium containing compounds. Different number of components with not negligible equilibrium molar amount was found for different glass compositions (9 or 10). In all glass compositions containing nonzero amount of Li
2
O, the four lithium compounds with not negligible equilibrium amount were identified, i.e., Li
2
O·SiO
2
, 3Li
2
O·P
2
O
5
, Li
2
O·2CaO·2SiO
2
, and 2Li
2
O·SiO
2
. In the 45S5 glass composition four phosphate compounds with not negligible abundance were identified: 9Na
2
O·6SiO
2
·2P
2
O
5
, Na
2
O·2CaO·P
2
O
5
, 5Na
2
O·4SiO
2
·P
2
O
5
, and Na
2
O·CaO·P
2
O
5
. In all other glasses the 3Li
2
O.P
2
O
5
was found with not negligible abundance. Moreover, in the glass with 4.1 mol% Li
2
O the Na
2
O·2CaO·P
2
O
5
and 3Li
2
O·P
2
O
5
compounds were found with not negligible abundance. For each studied glass the glass transition temperature, coefficient of thermal expansion of glass and metastable melt were measured by thermodilatometry. The low temperature viscosity was measured by thermomechanical analysis. The viscous flow activation energy was evaluated from the viscosity temperature dependence. The compositional dependence of measured thermal properties was analyzed by correlation analysis with the Q-distribution of silicate and phosphate units.
Publisher
Springer International Publishing,Springer,Springer Nature B.V
