PbF2-Al2O3 composites were obtained by reaction between Pb(NO3)(2) and NH4F solutions within micropores of porous alumina pellets at room temperature and 50 degrees C. They were compared with PbF2 powder prepared at room temperature and 50 degrees C in terms of morphology, phase stability and electrical conductivity. The deposit in the composites and powders prepared at room temperature consisted of alpha-PbF2 and beta-PbF2 while those obtained at 50 degrees C mostly consisted of beta-PbF2. Regarding the composites fabricated at room temperature and 50 degrees C, the initially deposited beta-PbF2 grains showed virtually no preferred orientation, while the subsequently formed grains showed significant preferred orientation with the [hh0] direction parallel to the growing direction. The conductivity of the composite obtained at room temperature was lower than that obtained at 50 degrees C. This is probably caused by the formation of the alpha phase because it has a lower conductivity than the beta phase. The composite obtained at 50 degrees C had a conductivity slightly lower than that of the pressed powder.