Figure 5: Calculated heats of formation per formula unit in M0.25T2PTe2 (T=Ti, Zr).
From: Selective and low temperature transition metal intercalation in layered tellurides

The heat of formation was defined as Ef=E(1T-M0.25T2PTe2)−E(3R-T2PTe2)−0.25E(M), where T=Ti (red) and Zr (blue); M=Cr, Mn, Fe, Co, Ni, Cu, Zn and Cd.