Vibrations de réseau de quelques dérivés dihalogénés du benzène

1979 ◽  
Vol 57 (14) ◽  
pp. 1814-1822 ◽  
Author(s):  
J. Serrier ◽  
F. Brehat ◽  
B. Wyncke ◽  
A. Hadni
Keyword(s):  
Raman Scattering ◽  
Long Range ◽  
Infrared Absorption ◽  
Low Frequency ◽  
Lattice Mode ◽  
Long Range Interactions ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
Experimental Values ◽  
Lattice Modes

Low frequency lattice modes of p-C6H4X2 (X = Cl, Br, I), m-C6H4I2, and o-C6H4I2 were observed by infrared absorption. Raman scattering spectra were recorded in the case of m-C6H4I2.When atomic positions were known in the unit cell (p-C6H4X2), the lattice mode frequencies were computed by the GF matrix method.The agreement between calculated and experimental values is reasonable although we did not consider the multipole–multipole long range interactions.

Experimental Study of the Liquid-Glass Transition in an Inorganic Polymer Li0.5Na0.5PO3

1995 ◽  
Vol 407 ◽  
Author(s):  
B. Rufflé ◽  
S. Beaufils ◽  
Y. Délugeard ◽  
G. Coddens ◽  
J. Etrillard ◽  
...  
Keyword(s):  
Experimental Study ◽  
Glass Transition ◽  
Raman Scattering ◽  
Viscous Flow ◽  
Liquid Glass ◽  
Low Frequency ◽  
Glass Forming ◽  
Scattering Spectra ◽  
Temperature Ranges ◽  
Raman Scattering Spectra

ABSTRACTNew experimental results obtained with various techniques on a less-studied glass-forming system are presented. At low frequency, a secondary βslow-process, decoupled from the viscous flow, is observed by 3 1P NMR. Raman scattering spectra and coherent neutron scattering spectra has been obtained in wide frequency and temperature ranges showing the same qualitative features for the Boson peak while the quasielastic contribution seems to differ markedly.

STRUCTURE AND TRANSPORT PROPERTIES OF Pr1-xSr1+xCoO4

2008 ◽  
Vol 22 (32) ◽  
pp. 3195-3205 ◽  
Author(s):  
M. LI ◽  
S. L. HUANG ◽  
Z. M. LV ◽  
J. L. ZHANG ◽  
H. Y. WU ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Low Frequency ◽  
X Ray Diffraction ◽  
Phonon Interaction ◽  
Band Shift ◽  
X Ray ◽  
Electron Phonon Interaction ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
Dramatic Variation

Powder X-ray diffraction, Raman scattering and infrared spectra at different doping (x = 0 ~ 0.5) on polycrystalline Pr 1-x Sr 1+x CoO 4 were performed. With increasing x, the shift of Raman scattering spectra is due to the enhancement of electron–phonon interaction along the c-axis. The contrary variation of infrared in wavenumber comes from the weakening electron–phonon interactions in the ab plane. There is a dramatic variation in resistivity as x increases, which is also caused by increasing carrier concentration and is related to the band shift. For Pr 1-x Sr 1+x CoO 4, both A1g bands shift to low frequency and reach a minimum when x = 0.3 and the resistivity of Pr 0.7 Sr 1.3 CoO 4 is the smallest at room temperature.

Raman Investigation of Aluminum-Doped 4H-SiC

2013 ◽  
Vol 740-742 ◽  
pp. 357-360 ◽  
Author(s):  
Sandrine Juillaguet ◽  
Pawel Kwasnicki ◽  
Hervé Peyre ◽  
Leszek Konczewicz ◽  
Sylvie Contreras ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Low Frequency ◽  
Frequency Range ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
P Type

Raman scattering spectra have been collected on p-type 4H-SiC samples doped with aluminum up to 5×1019atoms per cubic cm. The distortion and asymmetry of FTA modes which appear in the low frequency range has been probed in great details. We show that, using standard Fano formulae with three parameters per mode, one can successively fit all FTA modes profiles in the concentration range 2×1016– 5×1019Al.cm-3.

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