Open AccessMeasured enthalpy and derived thermodynamic properties of solid and liquid lithium tetrafluoroberyllate, Li2BeF4, from 273 to 900 K
Author(s) -
Thomas B. Douglas,
William H. Payne
Publication year - 1969
Publication title -
journal of research of the national bureau of standards. section a. physics and chemistry
Language(s) - English
Resource type - Journals
eISSN - 2376-5704
pISSN - 0022-4332
DOI - 10.6028/jres.073a.037
Subject(s) - enthalpy , thermodynamics , premelting , melting point , gibbs free energy , heat capacity , lithium (medication) , enthalpy of atomization , thermodynamic databases for pure substances , chemistry , standard enthalpy of reaction , materials science , material properties , physics , thermodynamic process , medicine , organic chemistry , endocrinology
The enthalpy of a sample of lithium tetrafluoroberyllate, Li 2 BeF 4 , of 98.6 percent purity was measured relative to 273 K at eleven temperatures from 323 to 873 K. Corrections were applied for the impurities and for extensive premelting below the melting point (745 K). The enthalpy and heat capacity, and the entropy and Gibbs free-energy function relative to the undetermined value of S 298.15 ° , were computed from empirical functions of temperature derived from the data, and are tabulated from 273 to 900 K.