The heat capacity of Li₂MoO₄ in the temperature range 6–310 K

Highlights: • The low temperature heat capacity of Li₂MoO₄ single crystal was measured. • Integral thermodynamic functions at 298.15 K were calculated. • An equation for extrapolation of heat capacity to 0 K was proposed. • The result of the analysis indicates to the possible existence of the bosonic peak. - Abstract: The heat capacity of a single crystal of lithium molybdate Li₂MoO₄ in the range 6–310 K was measured by the adiabatic method. No anomalous behavior of the heat capacity was found. Based on the obtained data, thermodynamic functions (entropy, enthalpy, and reduced Gibbs energy) under standard conditions were calculated. An equation for extrapolation of low-temperature heat capacity to 0 K was proposed, which has a wider temperature range of applicability as compared to the scope of validity of the Debye law (C ∼ T³). Analysis of heat capacity behavior points to the presence of a low-frequency peak in the density of phonon states for Li₂MoO₄