The solubility of the mixture SrLaAlO4 and BaLaAlO4 was investigated b
y solid-state reaction. The solubility of BaLaAlO4 in SrLaAlO4 was fou
nd to be 2.5 mol%. On the surface of the polycrystalline pellets, the
cubic phase of LaAlO3 was detected. Crystals of SrLaAlO4, BaLaAlO4 and
SrLaAlO4 doped Ba were obtained by the Czochralski method.