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Temperature dependence of the polarization, dielectric constant, damping constant and the relaxation time close to the ferroelectric-paraelectric phase transition in LiNbO3

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dc.contributor.author Kiracı, Ali
dc.contributor.author Yurtseven, H.
dc.date.accessioned 2020-02-21T11:47:58Z
dc.date.available 2020-02-21T11:47:58Z
dc.date.issued 2017
dc.identifier.citation Kİracı, Ali; Yurtseven, H., "Temperature dependence of the polarization, dielectric constant, damping constant and the relaxation time close to the ferroelectric-paraelectric phase transition in LiNbO3", Optik, Vol. 132, pp. 183-191, (2017). tr_TR
dc.identifier.issn 0030-4026
dc.identifier.uri http://hdl.handle.net/20.500.12416/2500
dc.description.abstract We calculate the order parameter (spontaneous polarization) and the inverse dielectric susceptibility at various temperatures in the ferroelectric phase of LiNbO3 for its ferroelectric-paraelectric phase transition (T-C =1260 K) using the Landau phenomenological model. For this calculation, the Raman frequencies of the soft optic mode (TO1) are used as the order parameter and the fitting procedure is employed for both the order parameter and the inverse dielectric susceptibility by means of the observed data from the literature. The temperature dependences of the damping constant and the inverse relaxation time are also computed using the pseudospin-phonon coupled model and the energy fluctuation model for the ferroelectric phase of LiNbO3. The activation energy is deduced from the damping constant for both models studied and compared with the k(B)T(C) value of LiNbO3. We find that the order parameter (Raman frequency of the TO1 mode) and the inverse dielectric susceptibility decrease with increasing temperature, as expected from the mean field model. We also find that the damping constant and the inverse relaxation time of this soft mode increases and decreases, respectively, with increasing temperature on the basis of the two models studied in the ferroelectric phase of LiNbO3. This indicates that our method of calculation is satisfactory to describe the observed behaviour of the ferroelectric-paraelectric phase transition in LiNbO3. tr_TR
dc.language.iso eng tr_TR
dc.publisher Elsevier GMBH tr_TR
dc.relation.isversionof 10.1016/j.ijleo.2016.12.020 tr_TR
dc.rights info:eu-repo/semantics/closedAccess tr_TR
dc.subject Mean Field Theory tr_TR
dc.subject Order Parameter tr_TR
dc.subject Dielectric Susceptibility tr_TR
dc.subject Damping Constant tr_TR
dc.subject Relaxation Time tr_TR
dc.subject LiNbO3 tr_TR
dc.title Temperature dependence of the polarization, dielectric constant, damping constant and the relaxation time close to the ferroelectric-paraelectric phase transition in LiNbO3 tr_TR
dc.type article tr_TR
dc.relation.journal Optik tr_TR
dc.contributor.authorID 42475 tr_TR
dc.identifier.volume 132 tr_TR
dc.identifier.startpage 183 tr_TR
dc.identifier.endpage 191 tr_TR
dc.contributor.department Çankaya Üniversitesi, Ortak Dersler Bölümü, Temel Mühendislik ABD Fizik Bilim Dalı tr_TR


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