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Thermodynamic Properties of Four Crystalline Sodium Borates.


PB203661

Publication Date 1971
Personal Author Pankratz, L. B.; Ferrante, M. J.
Page Count 12
Abstract Enthalpies above 298 K were investigated for four crystalline sodium borates by copper-block drop calorimetry. Determinations were made to 1,200 K for NaBO2, 1,003 K for Na2B4O7, 1,005 K for NaB3O5, and 1,046 K for Na2B8O13. No phase transitions or other thermal anomalies were found. The enthalpy determinations, when combined with known heats of formation at 298 K and other supplementary data, enabled the calculation of the heats and free energies of formation of the compounds to their melting points. Values of relative enthalpies, entropies, heat capacities, free energy functions, enthalpies of formation, free energies of formation, and equilibrium constants of formation were tabulated at even temperatures. (Author)
Keywords
  • Sodium borates
  • Thermodynamic properties
  • Calorimetry
  • Enthalpy
  • Heat of formation
  • Free energy
  • Entropy
Source Agency
  • Invalid Source Agency Code
NTIS Subject Category
  • 99F - Physical & Theoretical Chemistry
Corporate Authors BUREAU OF Mines, Washington, D.C.
Document Type Technical Report
Title Note Report of investigations.
NTIS Issue Number 197123
Thermodynamic Properties of Four Crystalline Sodium Borates.
Thermodynamic Properties of Four Crystalline Sodium Borates.
PB203661

  • Sodium borates
  • Thermodynamic properties
  • Calorimetry
  • Enthalpy
  • Heat of formation
  • Free energy
  • Entropy
  • Invalid Source Agency Code
  • 99F - Physical & Theoretical Chemistry
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