Abstract
Citrate gel method has been employed to produce homogeneous mixed rare-earth oxides in La 2− x Pr x O 3+ y (0≤ x≤2) system. The phases obtained at 1473 K in static air have been characterised for the entire range of compositions for their crystal structure. Hexagonal structure is stable for 0≤ x≤0.6 whereas cubic fluorite phase is stable for 1≤ x≤2. The unit cell parameters are reported for the range of single phase compositions. Wet-chemical analysis reveals that the compositions adopting hexagonal structure are stoichiometric ( y=0) whereas the compositions crystallising in the fluorite structure have the y increasing from 0.33 to 0.66 as x is varied from 1 to 2.
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