ملخص
The percolative nature of the ferroelectric phase transition in a potassium tantalate niobate (KTN) crystal is studied using time domain dielectric spectroscopy. A relaxation process linked to the off-center niobium ions is observed. The dynamic nature of this relaxation shows well defined temperature regimes in which it progresses from independent (Arrhenius) to cooperative (Vogel-Fulcher-Tammann) behavior. A recursive fractal model was applied in order to interpret the data obtained from the dielectric measurements. The structural parameters, ν and μ, derived from the correlation functions, enable the investigation of the onset of the phase transition in terms of the fractal dimensions of the polarization excitation.
اللغة الأصلية | الإنجليزيّة |
---|---|
الصفحات (من إلى) | 4422-4427 |
عدد الصفحات | 6 |
دورية | Journal of Non-Crystalline Solids |
مستوى الصوت | 353 |
رقم الإصدار | 47-51 |
المعرِّفات الرقمية للأشياء | |
حالة النشر | نُشِر - 1 ديسمبر 2007 |
منشور خارجيًا | نعم |