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Calculation of the raman frequency, damping constant (Linewidth) and the relaxation time near the tetragonal-cubic transition in PbTiO3

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dc.contributor.author Kiracı, Ali
dc.contributor.author Yuetseven, Hamit
dc.date.accessioned 2018-10-04T11:02:32Z
dc.date.available 2018-10-04T11:02:32Z
dc.date.issued 2017
dc.identifier.citation Kiracı, A., Yurtseven, H. (2017). Calculation of the raman frequency, damping constant (Linewidth) and the relaxation time near the tetragonal-cubic transition in PbTiO3. Optik, 142, 311-319. http://dx.doi.org/ 10.1016/j.ijleo.2017.06.011 tr_TR
dc.identifier.issn 0030-4026
dc.identifier.uri http://hdl.handle.net/20.500.12416/1824
dc.description.abstract Frequencies, damping constants and the relaxation times of some Raman modes including the two soft modes are calculated as a function of pressure near the tetragonal-cubic transition in PbTiO3. Calculation of the Raman frequencies is performed using the observed volume data from the literature by means of the mode Gruneisen parameter at various pressures. Pressure dependence of the damping constant and the relaxation time is predicted using the pseudospin-phonon coupled model and the energy fluctuation model by considering that the Raman frequency can be taken as the order parameter (spontaneous polarization) for the tetragonal-cubic transition in PbTiO3. Expressions from both models for the damping constants are fitted to the observed Raman linewidths of the two soft modes and for the other Raman modes the damping constant and the relaxation time are predicted close to the transition. We find that damping constants diverge and the inverse relaxation time decreases for the soft modes with increasing pressure near the critical pressure (P-c similar to 11 GPa). The other Raman modes exhibit unusual critical behavior. Our results indicate that the observed behavior of the Raman frequencies can be predicted from the volume data through the mode Gruneisen parameter for the tetragonal-cubic transition in PbTiO3. The damping constant and the relaxation time for the Raman modes can also be predicted adequately using the pseudospin-phonon coupled model and the energy fluctuation model to explain the mechanism of the phase transition between the tetragonal and cubic phases in PbTiO3 tr_TR
dc.language.iso eng tr_TR
dc.publisher Elsevier GMBH tr_TR
dc.relation.isversionof 10.1016/j.ijleo.2017.06.011 tr_TR
dc.rights info:eu-repo/semantics/closedAccess tr_TR
dc.subject Raman Frequency tr_TR
dc.subject Damping Constant tr_TR
dc.subject Relaxation Time tr_TR
dc.subject Tetragonal-Cubic Transition tr_TR
dc.subject PbTiO3 tr_TR
dc.title Calculation of the raman frequency, damping constant (Linewidth) and the relaxation time near the tetragonal-cubic transition in PbTiO3 tr_TR
dc.type article tr_TR
dc.relation.journal Optik tr_TR
dc.contributor.authorID 42475 tr_TR
dc.identifier.volume 142 tr_TR
dc.identifier.startpage 311 tr_TR
dc.identifier.endpage 319 tr_TR
dc.contributor.department Çankaya Üniversitesi, Ortak Dersler Bölümü, Temel Mühendislik ABD Fizik Bilim Dalı tr_TR


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