particle sizes did not exceed 1 g,m. Initial salts, intermediate products, and oxides were not detected in the powders.Palladium-based alloys are used in various branches of industry --as conductors and magnetic materials in microelectronics, in the preparation of diffusion elements for the purification of hydrogen, as selective catalyzers in organic synthesis, and for the removal of harmful gaseous byproducts. However, the number of methods for obtaining such alloys in the form of fine powder are limited. Synthesis of solid solution powders without including phases of the individual metals is very complicated.In the present work the possibility of obtaining powders of the solid solutions palladium-metal(M), where M = zinc, copper, nickel, or cobalt, by the thermal decomposition of binary complex salts of the type [Pd(NH3), where n = 4 for M = Cu(II), Zn(II), and n = 6 for M = Ni(II), Co0I) was studied. It was established earlier that the analogous binary salt of palladium ([Pd(NH3).][Pd(C204)2]) decomposes at a temperature near 200°C with the formation of a highly dispersed metallic powder. The possibilities of ammonium oxalate salts as initial systems for the synthesis of dispersed metallic composites are not limited by a low metallization temperature. The pyrolysis of such compounds occurs with the evolution of NH 3, CO 2, and CO in the gas phase. A reducing gaseous atmosphere forms in the thickness of the material, which can significantly decrease the decomposition temperature of the salt. Furthermore, the powder materials formed are not contaminated by the products of pyrolysis, and do not require prolonged and laborious purification.In pyrolysis of the binary compounds, in which the atoms of palladium and the second metal appear in a strictly determined ratio, the formation of solid solutions with the same Pd:M ratio is highly probable. Palladium forms a continuous series of substitutional solid solutions with copper, nickel, and cobalt [2], since these metals are similar in chemical properties and have the same type of crystal lattice (face-centered cubic); their atomic radii are also similar (difference less than + 10%). With zinc, palladium can form the intermetallic compounds PdZn, PdsZn21, /3-PdZn [3], as well as solid solutions of limited zinc concentration based on the palladium lattice.