Phonon dispersion relations for potassium thiocyanate at and above room temperature

Autor:	Trevor R Finlayson, D.J. Cookson, Margaret M. Elcombe
Rok vydání:	1992
Předmět:	Condensed matter physics business.industry Phonon Transverse wave Soft modes Neutron scattering Condensed Matter Physics Inelastic neutron scattering chemistry.chemical_compound Reciprocal lattice Optics chemistry Potassium thiocyanate Dispersion relation General Materials Science business
Zdroj:	Journal of Physics: Condensed Matter. 4:7851-7864
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/4/39/001
Popis:	The elastic stiffness constants of KSCN have been measured using a pulse-echo-overlap method at 10 MHz and compared to those for CsSCN. In both crystals it was found that transverse waves propagating normal to the minor planes encountered the greatest shear stiffness. Room temperature inelastic neutron scattering has been used to measure phonon energies of less than 5 THz in KSCN at various positions in reciprocal space. At higher temperatures the acoustic phonon resonances were found to soften gradually, while the optic modes exhibited largely unpredictable changes in width, frequency and intensity.
Databáze:	OpenAIRE
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