I 9 ) , acetylene (20), and ethene (21-23). However, in larger hydrocarbons such as allene and propyne (24), butenes through hexenes (25, 26), and styrene (29, the reactions proceed with less randomization. The differences observed here seem to point to a unique complex in the reactions of the 1,3-butadiene radical cation and isomeric C5H1~'s. Labelling studies as well as studies with other isomeric compounds (19) F. P. Abramson and J. H. Futrell,
Mössbauer and crystallographic investigations were carried out on DyFe3−x Nix compounds crystallizing in the PuNi3 type of structure. The hyperfine field observed at the iron sites shows a maximum at x =0.75. The 12-line spectrum observed at room temperature corresponding to the two different kinds of iron in the structure collapsed into a single six-line pattern at 4.2 K. Lattice parameter c shows a rapid decrease when x is increased beyond 2.0, but no such behavior was found in the a lattice parameter. The results of the x-ray and Mössbauer data are explained in terms of site preference and nonlocalized transition-metal moments, respectively.
Low-temperature heat-capacity measurements between 1.5 and 10 OK have been made on some compounds in the Y 1 -x ThxFe3 system (x =0.1, 0.3, 0.5, 0.7, 0.9, and 1.0). The electronic specific-heat coefficient ' Y exhibits a maximum at x =0.3. The lattice specific-heat coefficient /3 increases, while the Debye temperature 6 D decreases with increasing x. The results of this study are in agreement with a model proposed to explain the anomalous magnetic behavior of the Y 1-, Th, Fe3 system. The variation of ' Y as a function of x is discussed in tenns of a band model for the 3d transition metals.
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