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Yönelimsel Düzensiz Katılar ve Faz Geçişleri

Orientational Disorder Solids and Phase Transitions

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Abstract (2. Language): 
Molecules of some solids indicate positional order and orientational disorder which gives to solid different properties. With increasing temperature under melting temperature, changing of solid from a phase to the other, namely from a phase for which the molecules of solid have both position and orientation order , to a phase for which they have positional order but not orientational order, is studied theoretically. The variation of order parameters with temperature, solid-solid phase transitions and phase diagrams are studied by using modified Pople and Karasz model.
Abstract (Original Language): 
Bazı katıların molekülleri konumda düzenlilik fakat yönelimde düzensizlik göstermektedir ki bu durum katıya farklı özellikler kazandırmaktadır. Erime sıcaklığı altında sıcaklığın artırılması ile katının bir fazdan diğerine, yani moleküllerinin hem konum hem de yönelim düzenine sahip olduğu fazdan konumda düzenli fakat yönelimde düzensiz katı faza geçmesi teorik olarak incelendi. Modife Pople ve Karasz modeli kullanılarak düzen parametrelerin sıcaklıkla değişimi, katı- katı faz geçişleri ve faz diyagramları incelendi.
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