Abstract
The molecular constants of LnF2 (Ln = La-Lu) have been estimated based on the available spectro-scopic characteristics of lanthanum and lanthanide difluorides. These constants have been used for calculating the reduced Gibbs energy −[G 0(T) − H 0(0)]/T of the compounds in the ideal gas state in the range 298.15–3000 K at the standard pressure p 0 = 0.1 MPa. The electronic contribution to thermodynamic functions has been calculated taking into account the excitation energies of low-lying (<10 000 cm−1) electronic states of Ln2+ ions. The splitting of the ground state term of Ln2+ in the ligand field is estimated.
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