4.5 Article

Thermodynamic properties and phonon density of states of Tb2(C11H19O2)6

Journal

THERMOCHIMICA ACTA
Volume 697, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.tca.2021.178873

Keywords

Differential scanning calorimetry; Heat capacity; Thermodynamic functions; Phonon density of states; Terbium beta-diketonates

Funding

  1. Russian Foundation for Basic Research (RFBR) [19-03-00385]
  2. Ministry of Science and Higher Education of the Russian Federation

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The high-temperature thermodynamic properties of terbium tris-dipivaloylmethanate dimer were studied, including heat capacity, entropy, enthalpy, Gibbs energy, and phonon density of states calculations. The obtained results provided important parameters and characteristics of thermodynamic functions in the solid phase existence region.
The high-temperature thermodynamic properties of the terbium tris-dipivaloylmethanate dimer [Tb(C11H19O2)(3)](2) are studied. Heat capacity was measured by DSC in the range of 300-474 K. No anomalies in the heat capacity associated with phase transitions below the melting point were found. The isobaric thermodynamic functions: entropy, enthalpy increment and Gibbs energy in the range of 300-435 K were calculated. Based on the low-temperature heat capacity, the phonon density of states of terbium dipivaloylmethanate was calculated. Main characteristic temperatures, zero-point energy, isochoric heat capacity and thermodynamic functions: entropy, internal energy increment and Helmholtz energy in the entire region of the solid phase existence were obtained. Accuracy of the obtained results was estimated and the results were compared with the known data.

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