Measurements of the heat capacity of ammonium pentaborate tetrahydrate (NHBO·4HO), potassium pentaborate tetrahydrate (KBO·4HO), and sodium pentaborate pentahydrate (NaBO·5HO) 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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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323052PMC
http://dx.doi.org/10.6028/jres.068A.037DOI Listing

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