ISOVALENCE SUBSTITUTIONS IN MULTICOMPONENT ALUMINATES ABCO(4)

The crystallochemical characteristics of polycrystalline samples, Sr1- xLaxAlO4, Sr1-xNdxAlO4 (x = 0.02 divided by 0.20) and Sr1-xBixNdAlO4 ( x = 0.05 divided by 0.50) prepared by the oxalate coprecipitation and cryochemical technique have been investigated. The existence limits of single-phase states for pairs of elements Sr-Pb (x < 0.05) and Nd-Bi (x < 0.2) were determined. The microprobe S-ray analysis showed the Bi uniform distribution, The dielectric properties of pore SrLaAlO4, SrL aGaO4 and partial replacement La-Nd samples were measured. It can be c oncluded that these compounds are suitable as substrate materials of H TSC thin films.