The order-disorder phase transition in the Nd x Zr 1-x O 2-0.5x system is studied by complementary techniques which include wet chemical synthesis of a series of compositions with various Nd/Zr ratios with the final annealing at 1873 K, X-ray diffraction, oxide melt solution calorimetry and ab initio thermodynamic modeling.Our structural data indicate the transition from ordered to disordered pyrochlore at x ~ 0.31at a temperature of1873 K. Our calorimetric data show a transition enthalpy of ~30 kJ/mol, which corresponds to an entropy of disordering of ~16 J/K/mol. The latter value is significantly smaller than the configurational entropy of transition computed under the

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