Enthalpy measurements of La2Te3O9 and La2Te4O11

Abstract Enthalpy increment measurements on La 2 Te 3 O 9 (s) and La 2 Te 4 O 11 (s) were carried out using a Calvet micro-calorimeter. The enthalpy values were analyzed using the non-linear curve fitting method. The dependence of enthalpy increments with temperature was given as: H° ( T ) − H° (298.15 K) (J mol −1 ) = 360.70 T + 0.00409 T 2 + 133.568 × 10 5 / T − 149 923 (373 ⩽ T (K) ⩽ 936) for La 2 Te 3 O 9 and H° ( T ) − H° (298.15 K) (J mol −1 ) = 331.927 T + 0.0549 T 2 + 29.3623 × 10 5 / T − 114 587 (373 ⩽ T (K) ⩽ 936) for La 2 Te 4 O 11 .