Palladium-based alloys with yttrium, copper, ruthenium or indium additions were investigated. Their specific hydrogen permeability, strength, linear thermal expansion in hydrogen and corrosion resistance in a number of gas media were determined. This allowed effective membrane elements to be developed using membranes made from these alloys, which are used for the separation of high purity hydrogen from hydrogen-containing gas mixtures. Membrane elements with 93.5 wt% palladium-6 wt% indium-0.5 wt% ruthenium alloy membranes were developed by the authors’ research group, and their technical characteristics are described.

The frequency dependence of the real and imaginary parts of the complex dielectric constant c(w) in compounds XMnY (X = Ni, Pd, Pt, Cu; Y = Sb, Sn) having Clb structure are investigated in the spectral range hw = 0.05 to 8 eV. The values of conduction electron plasma and relaxation frequencies wp and y, respectively, are determined. The evolution of interband conduction and electron energy-loss function -1m ( E -' ) for varying compositions is studied. In all the compounds, apart from the main absorption band located in the spectral range 1 to 7 eV, a low-energy ( h a = 0.3 to 0.7 eV) interband absorption is revealed. An estimation is made of the energy gap at point r of the Brillouin zone in the minority-spin subbands (1) for NiMnSb using optical data. B CneKTpanbHOii o 6 n a c~~ hO = 0,05 A0 8 eV WCCJIeAOBaHa 3aBWCAMOCTb AeiiCTBWTenbHOii W MHUMOg WCTeg KOMnneKCHOfi AU3JIeKTpH' IeCKOii IIpOHUIlaeMOCTU &(O) COegUHeHUa XMnY ( x = Ni, Pd, Pt, CU; Y = Sb, Sn) C KpUCTannHYeCKOfi CTpYKTYpO5 c1,. OlTpeneneHbI 3HaWHAX IIJIa3MeHHOfi Wp A PeJIaKCauUOHHO~ y YilCTOT 3JIeKTPOHOB npOBOAAMOCTA. M3YYeHa 3BOJIK)uUX MeX3OHHOfi IIPOBOAA-MOCTA A @YHKIIAM XapaKTepMCTAqeCKMX nOTepb 3HeprMA 3neKTpOHOB -Im ( E -') IIpA U3MeHeHAU YsaCTKe CneKTpa 1 A0 7 ev, 06HapyXeHO HH3K03HePTeTHYeCKOe (hO = 0,3 A 0 0,7 ev) MeX30HHOe nOrn0ILleHHe. &IS NiMnSb Ha OCHOBe OnTWYeCKUX AaHHblX CfleJEiHa OlleHKa ~O~~llpOBO~HUKOBOfi UeJIIl B TOYKC! r 30HbI EpWJIJIIo3Ha B CnUHOBO% nOA30He C MeHbUIUHCTBOM CnMHOB (1). KOMIIOSAUAA. Bo Bcex coeAmeHEiax IIOMUMO O C H O B H O~ nonocbI nomomeHm, pacnonoxemoi ~a

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