Calorimetric and structural studies of La1−xYxAlO3 and Y1−xLuxAlO3 crystals

Author： Kyomen T.   Itoh M.  

Publisher： Springer Publishing Company

ISSN： 1388-6150

Source： Journal of Thermal Analysis and Calorimetry, Vol.69, Iss.3, 2002-09, pp. : 813-819

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Abstract

Powder X-ray diffraction measurements of La1−xYxAlO3 suggested that the space groups of x=0.3 and 0.9 samples are Pnma at room temperature and that a structural phase transition occurs from R-3c to Pnma above 200 K in x=0.1 sample. The unit cell volumes of x=0.1, 0.3, and 0.9 samples at 20 K are larger than the average one estimated from the volumes of LaAlO3 and YAlO3. The heat capacities of x=0.1 and 0.3 samples are larger than those of LaAlO3 in the range 3–20 K. On the other hand, the volumes of Y1−xLuxAlO3 (x=0.1, 0.3, and 0.5) at 20 K are close to the average one and the heat capacity increased as x is increased in the range 3–20 K.

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