Kuartzın alfa beta geçişi.

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, Türkiye

Tezin Onay Tarihi: 2011

Tezin Dili: İngilizce

Öğrenci: Mustafa Cem Lider

Danışman: HASAN HAMİT YURTSEVEN

Özet:

Alpha-Beta transition in quartz is studied using the Raman scattering. The Raman frequencies of some lattice modes are analyzed at various temperatures close to the alpha beta transition in quartz. For this analysis, the experimental data from the literature is used and the soft mode behavior of those Raman phonons is investigated . On the basis of the predictions of some models, the temperature dependencies for the Raman frequencies of the lattice modes which move towards zero (soft mode) and their bandwidths close to the transition temperature Tc are explained for the alpha-beta transition in quartz. In addition, by using the experimental volume data from literature, calculation of the temperature dependence of the Raman frequencies through the Grüneisen parameter have been studied near the phase transition.