תקציר
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.
שפה מקורית | אנגלית |
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עמודים (מ-עד) | 4422-4427 |
מספר עמודים | 6 |
כתב עת | Journal of Non-Crystalline Solids |
כרך | 353 |
מספר גיליון | 47-51 |
מזהי עצם דיגיטלי (DOIs) | |
סטטוס פרסום | פורסם - 1 דצמ׳ 2007 |
פורסם באופן חיצוני | כן |