ISSN:
1434-6036
Keywords:
PACS. 77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc. - 63.20.-e Phonons in crystal lattices - 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: High resolution data on low energy phonon branches (acoustic and soft optic) along the three principal symmetry axes in pure KTaO3 were obtained by cold neutron inelastic scattering between 10 and 80 K. Additional off-principal axis measurements were performed to characterize the dispersion anisotropy (away from the and axes). The parameters of the phenomenological model proposed by Vaks [28] are refined in order to successfully describe the experimental low temperature (10 〈 T 〈 100 K) dispersion curves, over an appreciable reciprocal space volume around the zone center ( rlu). The refined model, which involves only 4 temperature-independent adjustable parameters, is intended to serve as a basis for quantitative computations of multiphonon processes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00011049
Permalink
