Second-order Raman spectra and phonon spectrum of LiD

Experimental evidence of strong phonon scattering in isotopical disordered systems: The case ofLiHxDVg1 1995Phys. Rev. B19290View full textAdd to dashboardCite

“…25). First of all it is important to remark here on the close agreement between the pictured spectra of virgin LiH and LiD and previously published data [7][8][9][10][11][12][13]. Moreover, the practically constant low frequency structure of all the spectra is remarkable, primarily associated with lithium ion vibrations [9 -13,22].…”

“…The effect of isotope substitution and its influence on the LiH lattice dynamics has a long history. IR-absorption and -reflection [3][4][5], neutron scattering [6] as well as Raman scattering [7][8][9][10][11][12][13] studies allow us to discover the local [7] and gap [3] modes in the vibration spectra of LiH-D mixed system. According to these studies the energy of the LO phonons at the Γ point of the Brillouin zone is equal to 840 and 1100 cm −1 for LiD and LiH and for the local (LiD-H) and gap (LiH-D) modes -respectively 917 and 580 cm −1 .…”

Ab initio electronic, dynamic, and thermodynamic properties of isotopic lithium hydrides (6LiH, 6LiD, 6LiT, 7LiH, 7LiD, and 7LiT)

“…The phonon dispersion of LiD [2] and the frequency distribution functions of LiH and LiD [3] have been measured by inelastic neutron scattering as well as Raman and infrared measurements; Experimental values of the elastic constants [4][5][6][7] and the specific heat [8] of LiH and LiD have been published. On the other hand, LiH and LiD have also been the subject of extensive theoretical investigations, Dilly and Jaswal et al [9,10] studied the phonon dispersion curves of LiH and LiD using the Hardy deformation dipole model as well as the deformable-ion model; Singh and Laplaze [11][12][13] investigated the phonon dispersions of LiH and LiD employing rigid and deformable shell models, respectively; The most successful atomistic simulations on LiH and LiD are the seven parameter shell model proposed by Verble et al [14]. However, the properties of LiT have been investigated only scarcely.…”

Hydrides and Deuterides of Lithium and Sodium. I. Model Potentials and Their Use in Perfect Lattice

“…This has to be allowed since there is uncertainty and inconclusive evidence for many-body effects [ll, 371. It may be mentioned here that even the model of Verble et al [38] and Jaswal et al [6], underestimates or overestimates the value of Clz, respectively.…”