Elastic properties and lattice dynamics of ruthenium at high pressures
MetadataShow full item record
The elastic properties and structural stability in ruthenium under pressure are investigated. The analysis is performed in the framework of Landau theory and nonlinear elasticity. For this purpose the definition of effective elastic constants (EC) of n-th (n=2) order characterizing elastic properties of loaded crystal and the relations between effective EC and corresponding EC of Bragger type for hcp crystals is given. The conditions of hcp lattice stability to the uniform shear strain under the pressure P are expressed in terms of the second order effective EC. The method of effective EC calculations for hcp crystals under hydrostatic pressure is presented. The equation of state and EC of second and third order and phonon dispersion relations in high-symmetry directions in the pressure range of 0-600 GPa are calculated in the framework of the density functional theory (DFT) and the density functional perturbation theory (DFPT) respectively. EC are in the good agreement with available experimental data and increase monotonically with pressure, no softening or stability condition violation are observed. Softening of phonon frequencies near the Brillion zone center is also not observed.
Showing items related by title, author, creator and subject.
Investigation of pressure and saturation effects on elastic parameters: an integrated approach to improve time-lapse interpretationGrochau, Marcos Hexsel (2009)Time-lapse seismic is a modern technology for monitoring production-induced changes in and around a hydrocarbon reservoir. Time-lapse (4D) seismic may help locate undrained areas, monitor pore fluid changes and identify ...
Prediction of sonic velocities in shale from porosity and clay fraction obtained from logs - A North Sea well case studyPervukhina, Marina; Golodoniuc, P.; Gurevich, Boris; Clennell, M.; Dewhurst, D.; Nordgård-Bolås, H. (2014)Prediction of sonic velocities in shales from well logs is important for seismic to log ties if the sonic log is absent for a shaly section, for pore pressure anomaly detection, and for data quality control. An anisotropic ...
Nanoscale elastic-plastic deformation and mechanical properties of 3C-SiC thin film using nanoindentationNawaz, A.; Islam, B.; Mao, W.; Lu, Chunsheng; Shen, Y. (2018)© 2018 The American Ceramic Society The elastic-plastic deformation of 3C-SiC thin film was investigated by a nanoindenter equipped with the Berkovich tip. Transition from pure elastic to elastic-plastic deformation was ...