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Thermodynamic Properties of Two Lithium Silicates (Li2SiO3 and Li2Si2O5).

PB262122

Publication Date	1976
Personal Author	Bennington, K. O.; Ferrante, M. J.; Stuve, J. M.
Page Count	25
Abstract	Thermodynamic properties were determined by the Bureau of Mines for lithium metasilicate and lithium disilicate. Their enthalpies of formation were investigated by the method of hydrofluoric acid solution calorimetry. The standard enthalpy of formation values are -393.8 plus or minus 0.8 kcal/mole for lithium metasilicate and -611.8 plus or minus 1.0 kcal/mole for lithium disilicate. Enthalpy increments above 298 K were measured by copper-block drop calorimetry from 298 to 1,404 K for the metasilicate and from 298 to 1,281 K for the disilicate. Low-temperature heat capacities were determined adiabatically from 6 to 305 K for the disilicate only. The derived standard entropy is 29.20 plus or minus 0.10 cal/deg mole. The various experimental data were combined with other data from the literature and the resulting thermodynamic properties were tabulated as a function of temperature.
Keywords	Thermodynamic properties Inorganic silicates Enthalpy Gibbs free energy Specific heat Heat of solution Tables(Data) Heat measurement Lithium inorganic compounds Lithium silicates
Source Agency	Bureau of Mines
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau Of Mines, Albany, Oreg. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations 1976.
NTIS Issue Number	197707

Thermodynamic Properties of Two Lithium Silicates (Li2SiO3 and Li2Si2O5).

Thermodynamic Properties of Two Lithium Silicates (Li2SiO3 and Li2Si2O5).
PB262122

Publication Date	1976
Personal Author	Bennington, K. O.; Ferrante, M. J.; Stuve, J. M.
Page Count	25
Abstract	Thermodynamic properties were determined by the Bureau of Mines for lithium metasilicate and lithium disilicate. Their enthalpies of formation were investigated by the method of hydrofluoric acid solution calorimetry. The standard enthalpy of formation values are -393.8 plus or minus 0.8 kcal/mole for lithium metasilicate and -611.8 plus or minus 1.0 kcal/mole for lithium disilicate. Enthalpy increments above 298 K were measured by copper-block drop calorimetry from 298 to 1,404 K for the metasilicate and from 298 to 1,281 K for the disilicate. Low-temperature heat capacities were determined adiabatically from 6 to 305 K for the disilicate only. The derived standard entropy is 29.20 plus or minus 0.10 cal/deg mole. The various experimental data were combined with other data from the literature and the resulting thermodynamic properties were tabulated as a function of temperature.
Keywords	Thermodynamic properties Inorganic silicates Enthalpy Gibbs free energy Specific heat Heat of solution Tables(Data) Heat measurement Lithium inorganic compounds Lithium silicates
Source Agency	Bureau of Mines
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau Of Mines, Albany, Oreg. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations 1976.
NTIS Issue Number	197707