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'Far Infrared Reflection Spectra' in keywords Facet   Publication Year 1992  [X]
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1992[X]
1Author    G. Küche3, J. K. Öhler3, W. BauhoferbRequires cookie*
 Title    Röntgenographische, elektrische und spektroskopische Untersuchungen an den Palladiumchalkogeniden P d S ^ S e * Roentgenographic, Electrical and Spectroscopic Investigations of the Palladium Chalcogenides P d S ^ S e  
 Abstract    Silvery reflecting melting cakes o f P d S ^ S e * (0.0 < jc < 1.0) have been prepared by annealing mixtures o f Pd, S and Se at 873 K in evacuated quartz tubes. The PdS-type mixed crystals are stable only in the ranges 0.0 < .x < 0.2 and 0.9 < x < 1.0, whereas a new phase appears in the intermediate region. The new phase P dS|_vSev (0.2 < x < 0.9) crystallizes in the space group P 42/m bc and Z = 24. Lattice constants are a = 1126.2(7), c = 683.2(7) pm (PdS0 6Se04) and a = 1130.8(9), c = 685.4(8) pm (PdS04Se0 6). The relationships between the new structure type and the PtS and PdS structure types are discussed. The infrared reflection spectra o f polycrystalline samples o f PdS were measured between 10 and 300 K in the frequency range from 30 to 400 cm -1. Both phonons and plasmons contrib­ ute to the spectra. The temperature dependence o f the plasmon contribution shows an unusual behaviour which is explained by the assumption o f a phonon assisted hopping conductivity mechanism at low temperatures and a Drude-like transport at high temperatures. The normal mode which may be involved in the hopping process is proposed from a normal coordinate calculation using a three-parameter short range valence force field model. The electrical trans­ port data are in general agreement with the optical ones. The infrared spectra o f the mixed crystals P d S ^ S e,. (0.2 < x < 1) are discussed. 
  Reference    Z. Naturforsch. 47b, 383—3 (1992); eingegangen am 31. Juli 1991 
  Published    1992 
  Keywords    Palladium Sulfide, Palladium Selenide, Far-Infrared Reflection Spectra, Electrical Properties, Hopping Conductivity 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0383.pdf 
 Identifier    ZNB-1992-47b-0383 
 Volume    47