Heat Capacity of La<SUB>1&minus;<I>X</I></SUB>Sr<I><SUB>X</SUB></I>FeO<SUB>3&minus;&delta;</SUB> from 2 K to 1340 K

Abstract

Isobaric heat capacities, C p , of La X Sr 1ÀX FeO 3À solid solutions from near absolute zero Kelvin (2 K) to high temperature (1340 K) were measured by a relaxation method and differential scanning calorimetry. Also, their Debye temperatures,  D , were determined from the measured C p values below 10 K and isochoric heat capacities, C V , were calculated by inserting the  D values into Debye functions, followed by calculating the isochoric entropies of vibration, Á Keywords: La X Sr 1ÀX FeO 3À , isobaric heat capacity, Debye temperature, isochoric heat capacity, entropy of vibration of oxygen vacancy

Formation energies of the intermetallic compounds at the ground and thermally excited states determined by the ab initio energetic calculation and calorimetric measurement

“…In our previous studies 11–15, the standard enthalpies of formation at 298 K, Δ f H , of the intermediate compounds of the Mg‐Zn and Mg‐La binary systems, Mg 0.48 Zn 0.52 11, Mg 0.4 Zn 0.6 12, Mg 0.333 Zn 0.667 13, Mg 0.154 Zn 0.846 13, Mg 0.75 La 0.25 14, and Mg 0.5 La 0.5 15 were determined by using a new Calvet‐type calorimeter equipped with a new thermoelectric device 16. Also, their isobaric heat capacity, C p , values were measured at 2–400 K by the recently developed method of relaxation calorimetry 17, 18 and at 400–650 K by the heat flow specially stabilized DSC 19–21.…”