|
| ||
|
|
||
Brillouin Spectroscopy (brillouin + spectroscopy)
Selected AbstractsShear Modulus of Polycrystalline Rhenium Diboride Determined from Surface Brillouin SpectroscopyADVANCED MATERIALS, Issue 42 2009Sergey N. Tkachev Surface Brillouin specotroscopy of a densified powder compact of rhenium diboride (see scanning electron microscopy image) results in a determined shear modulus of 223,GPa. This value is comparable to the shear modulus of c-BC2N and provides evidence for the superhard nature of ReB2. [source] Contribution to the study of elastic properties of KGd(WO4)2:Er3+ single crystals by Brillouin spectroscopyCRYSTAL RESEARCH AND TECHNOLOGY, Issue 12 2009D. Kasprowicz Abstract In this paper we present the study of the acoustic phonons propagating in Er3+ -doped KGd(WO4)2 single crystals by Brillouin spectroscopy. For the investigated crystals the velocities of the longitudinal and transverse acoustic phonons [100], [010], [001], [101] and [110] have been determined. Moreover, the values of the elastic constants: C22, C44 and C66 of Er3+ -doped KGd(WO4)2 single crystals have been estimated. It was revealed that the presence of the Er3+ -ions in KGd(WO4)2 crystals, for the used doping concentration 1 at% does not influence their elastic properties. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Optical properties of KGd(WO4)2 single crystals studied by Brillouin spectroscopyCRYSTAL RESEARCH AND TECHNOLOGY, Issue 6 2006D. Kasprowicz Abstract The results of a study of KGd(WO4)2 single crystals by Brillouin scattering method are presented. The Brillouin spectra for the acoustic phonons propagating in the [100], [010], [001], [110] and [101] directions, taken in 90° and 180° scattering geometry at room temperature have been recorded. Using the Brillouin spectroscopy the refractive indices for some directions of KGd(WO4)2 crystals were determined. The refractive indices were also calculated for the same directions by the rotation transformation of the principal optical axes of the optical indicatrix to the crystallographic directions of KGd(WO4)2 crystals. Moreover, some anomalies of the acoustic phonons propagating connected with birefringence of KGd(WO4)2 crystals were discussed. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Elastic constants of aluminum nitridePHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2007M. Kazan Abstract We report on the application of Brillouin spectroscopy as an approach to non-destructive optical characterization of the elastic constants of semiconductors with the wurtzite symmetry. Three different configurations were used to achieve a complete determination of the elastic stiffness constants of bulk AlN substrates grown by the Physical Vapor Transport (PVT) method. The scattering diagrams of these three configurations are presented showing the geometrical arrangements necessary to observe all the elastic stiffness constants for the partially nontransparent wurtzite type of the crystal structure. Because aluminum nitride (AlN) is a suitable material for the fabrication of light emitting devices, the characterization of its elastic constants was carried out very precisely to provide a reliable data which can be used for the determination of residual stress arising during the growth of AlN thin films or wide band gap semiconductor thin films on substrates of AlN. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] | ||||||||||