First-principles study of the elastic and thermodynamic properties of thorium hydrides at high pressure

Zhang Xiao-Lin¹, Wu Yuan-Yuan¹, Shao Xiao-Hong^{1, †,}, Lu Yong², Zhang Ping^{2, ‡,}

Dependences of the Helmholtz free energy F(T,V) on crystal volume at various temperatures for (a) bct ThH₂ and (b) bcc Th₄H₁₅.