Calorimetric investigation of new Bi12.5Dy1.5ReO24.5 phase

The Bi12.5Dy1.5ReO24.5 phase has been prepared from Bi2O3, Dy2O3, and Re2O7. X-ray measurements have showed that Bi12.5Dy1.5ReO24.5 has a cubic structure (Fm3m space group). The standard formation enthalpy of Bi12.5Dy1.5ReO24.5 has been determined by solution calorimetry combining solution enthalpies of Bi12.5Dy1.5ReO24.5, 6.25Bi(2)O(3) + 0.75Dy(2)O(3) + 0.5Re(2)O(7) mixture in 2 M HCl and literature data. Dependence on rare-earth radius for Bi12.5R1.5ReO24.5 (R = La, Nd, Gd, Dy) formation enthalpies from binary oxides was constructed. It has been showed that this dependence is linear. (C) 2012 Elsevier B.V. All rights reserved.