Formation enthalpies of LaLn׳O3 (Ln׳=Ho, Er, Tm and Yb) interlanthanide perovskites

A linear relationship between the enthalpy of formation and the tolerance factor for interlanthanide LaLn׳O3 (Ln׳=Ho, Er, Tm, and Yb) and other LaM3+O3 (M=In, Sc, Ga, Al, Fe and Cr) perovskites.124