Abstract
In-situ micro-Raman scattering spectra of LaNi 3.4 Co 1.2 Mn 0.1 Al 0.3 metal hydride were observed in a hydrogen atmosphere at pressures up to 1 MPa using a specially designed micro-pressure cell. For the fresh surface created by cracking, broad components near 1600 cm -1 and 2900 cm -1 appear and grow in the depolarized Raman spectra as the pressure increases to the β phase region. In addition to this, sharp components appear near 3000 cm -1 in the polarized spectra in both α and β phases. The sharp and broad components are assigned to oxides and vibration of hydrogen atoms in the metal hydride, respectively. On the other hand, characteristic Raman spectra rarely appear for the polished flat surface. These results indicate that the catalytic fresh surface area created by cracking plays an important role in the hydride formation.
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