Abstract
The temperatures and enthalpies of phase transitions in the system Na 1+ X Zr 2Si XP 3- X O 12 with 1.9 ⩽ X ⩽ 2.5, have been determined by differential scanning calorimetry. Second-order phase transitions were observed in all samples except for X = 2.5. The transition temperatures decreased systematically with X, varying from approximately 423 K for X = 1.9 to 375 K for X = 2.3. The enthalpies of transition followed a similar trend, 2.11 kJ mol −1 for X = 1.9 and 0.52 kJ mol −1 for X = 2.3.
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