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Updated: Jan 2, 2026

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Calorimetric Properties of Some Alkali Pentaborate Hydrates From 15 to 370 °K
Abstract:
Measurements of the heat capacity of ammonium pentaborate tetrahydrate (NH4B5O8·4H2O), potassium pentaborate tetrahydrate (KB5O8·4H2O), and sodium pentaborate pentahydrate (NaB5O8·5H2O) were made in the range of about 15 to 370 °K and the data were used to obtain a table of smoothed values of thermodynamic functions from 0 to 370 °K. The measurements on sodium pentaborate pentahydrate were terminated at 345 °K because the temperature drifts that were observed above this temperature were considered to arise from gradual volatilization of the water of hydration.
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