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We report first-principles phonon frequencies and anharmonic thermodynamicproperties of h.c.p. Re and Tc calculated within the quasi-harmonicapproximation, including Gr\"uneisen parameters, temperature-dependent latticeparameters, thermal expansion, and isobaric heat capacity. We discuss thedifferences between a full treatment of anisotropy and a simplified approachwith a constant $c/a$ ratio. The results are systematically compared with theavailable experimental data and an overall satisfactory agreement is obtained.

Lattice dynamics and thermophysical properties of h.c.p. Re and Tc from the quasi-harmonic approximation