INELASTIC SCATTERING OF THERMAL NEUTRONS BY METAL HYDRIDES ZrH<SUB>1.66</SUB> AND TiH<SUB>1.92</SUB>

EUAN JING-HUI; CHENG ZHI-SHIUH; CHEN GUI-YING; LI ZHU-CHI; LU TING; WU SHAN-LING

Chinese Physics C> 1978, Vol. 2> Issue(5) : 441-449

INELASTIC SCATTERING OF THERMAL NEUTRONS BY METAL HYDRIDES ZrH_1.66 AND TiH_1.92

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Abstract：
Inelastic scattered neutron spectra of metal hydrides ZrH_1.66 and TiH_1.92 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.

References

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G. Alefeld, "Comments on solid state physics", 6 (1975), 53.[2] W. L. Whittemore "Prcoeedings series inelastic scattering of neutrons", (Held at Bombay, 1964) Vol. 2, p. 305.[3] W. Glaser,"In symposium on nentron thermalisation and reactor spectra", (I. A. E. A. Vienna 1968), Vol. 1, p. 235.[4] S. N. Puroht, et a1, "In symposium on neutron thermalisation and reactor spectra", (1968),Vol. 1, p. 407.[5] J, G. Couch, et al., Phys. Rev., B4 (1971), 2875.[6] E. L. Slaggie, J. Phys. Chem. Solids, 29 (1965 ) , 923.[7] S. S. Pan and F, J. Wobb, Nucl, Sci, and Eng., 23(1965), 194.[8] W, Marshall and W, Loveaey, "Theory of thermal neutron scattering", (1971), 97.[9] W. Glser, et al., [3] [2] Vol. II (1964), 167.

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EUAN JING-HUI, CHENG ZHI-SHIUH, CHEN GUI-YING, LI ZHU-CHI, LU TING and WU SHAN-LING. INELASTIC SCATTERING OF THERMAL NEUTRONS BY METAL HYDRIDES ZrH_1.66 AND TiH_1.92[J]. Chinese Physics C, 1978, 2(5): 441-449.

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Received: 1977-01-12
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

INELASTIC SCATTERING OF THERMAL NEUTRONS BY METAL HYDRIDES ZrH_1.66 AND TiH_1.92

Received Date: 1977-01-12
Accepted Date: 1900-01-01
Available Online: 1978-10-05

Abstract: Inelastic scattered neutron spectra of metal hydrides ZrH_1.66 and TiH_1.92 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.