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在本院重水堆旁的铍过滤探测器中子非弹性散射谱仪上,对氢化锆(ZrH_(1.7))(含碳0.2％)和钯氢(PdH_(0.7))两种金属氢化物在室温和低温(97K)两种温度下,分别测定了光学声子能谱。结果表明:氢化锆的光学声子能级是等间距的,能级宽度基本上不随温度变化,即光学声子的非谐性是微弱的,较好地遵从爱因斯坦的谐振模型;而钯氢的第二个光学声子能级间距大于第一个能级间距约8meV,并且光学声子能级的宽度从室温下的38meV变化到低温(97K)下的20meV,这表明对钯氢的超导性起决定作用的光学声子,存在较明显的非谐性。
In the neutron inelastic scattering spectrometer near the heavy water reactor of the beryllium filter, two kinds of metal hydride, zirconium hydride (ZrH_ (1.7)) (0.2% carbon) and palladium hydrogen (PdH_ (0.7) Optical phonon spectra were measured at room temperature and low temperature (97K) respectively. The results show that the optical phonon levels of zirconium hydride are equally spaced, and the energy level width is basically independent of temperature. That is, the optical phonons have weak non-harmonics, which obeys Einstein’s resonance model well. Palladium The second optical phonon level spacing of hydrogen is greater than the first level spacing by about 8 meV and the optical phonon level width varies from 38 meV at room temperature to 20 meV at low temperature (97K) Superconductivity plays a decisive role in the optical phonon, there is more obvious non-harmonic.