Crystal structure and lattice dynamics of chromium hydridesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Samples of fcc (gamma) CrH and hcp (epsilon) CrH have been prepared by cathodic electrodeposition of chromium and studied by powder neutron diffraction at 8 K and by inelastic neutron scattering'(INS) at 5 K in the range of energy transfers 6-400 meV. A profile analysis of the neutron diffraction patterns showed that hydrogen occupies octahedral interstitial sites in the fcc metal lattice of gamma-CrH with a = 3.854(3) angstrom and in the hcp metal lattice of epsilon-CrH with a = 2.719(3) angstrom and c = 4.433(4) angstrom. No magnetic ordering was detected in either hydride at 8 K. The INS investigation demonstrated that the fundamental band of optical hydrogen vibrations in both hydrides consists of a strong peak with a broad shoulder towards higher energies. The peak position is 118 meV for gamma-CrH and 122 meV for epsilon-CrH.