Based on the double-sphere coordination point-charge field (DSCPCF) model, the coordination field perturbation levels were calculated and the f-f transition spectra of Eu3+ ion in LaAlO3:Eu were analyzed at 77,300 and 500K. The results are in reasonably good agreement with experimental observation. With the increase of temperature, the small variations of the calculating parameters are noted owing to a shift in symmetry at the europium site (D-3-->O-h), i.e., the parameter x which described completely the crystal structure approximates 0.5, the average bonding distances of the three types of coordinated atoms tend to be the same. The coordination field parameters obtained were varied regularly. Especially, the sign of B-2(0) at 500K was changed to negative so that the calculated DSCPCF levels differed from that at the other two temperatures.
