A stabilized tetragonal phase of La2O3 in the LaPdO system

Based on an X-ray diffraction study, it is shown that the product of the reaction between PdCl2 and La2O3 in air or of the thermal decomposition of mixed La and Pd nitrates contains, besides some PdO, a novel tetragonal oxide phase ( P4 mmm ) which is best described as a stabilized tetragonal phase of La2O3 containing a small proportion of PdO.