INELASTIC SCATTERING OF THERMAL NEUTRONS BY METAL HYDRIDES ZrH1.66 AND TiH1.92 |
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| Authors: | EUAN JING-HUI CHENG ZHI-SHIUH CHEN GUI-YING LI ZHU-CHI LU TING WU SHAN-LING |
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| Abstract: | Inelastic scattered neutron spectra of metal hydrides ZrH1.66 and TiH1.92 have been measured by beryllium filter detector spectrometer and their phonon spectra have been deduced from the neutron spectra according to the A. Sjölander formula by iterative method. The optical branches of the two samples thus obtained are approximately Gaussian distributions and their positions are in agreement with other works, while their PWHM are smaller than the value uncorrected for multiphonons effect reported elsewhere. Their acoustic branches obtained are of neither Debye nor Gaussian type but show a double-numped configurations. Some new configurations have been observed between the optical and acoustic branches which may be attributed to localized modes as a result of disorder. |
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