High-temperature investigations of the rare earth NZP phosphates R1/3Zr2(PO4)3 (RÂ =Â La, Nd, Eu, Lu) by drop calorimetry

The high-temperature enthalpy increments of the phosphates La1/3Zr2(PO4)3, Nd1/3Zr2(PO4)3, Eu1/3Zr2(PO4)3 and Lu1/3Zr2(PO4)3 have been measured by high-temperature drop calorimetry in the temperature range 484.5-1090.7 K. From these results the heat capacity of the studied compounds has been derived.