کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7882672 | 1509612 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dielectric properties of 0.4Na0.5Bi0.5TiO3-(0.6-x)SrTiO3-xPbTiO3 solid solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this paper we present our measurements of the linear and nonlinear dielectric permittivity of 0.4Na0.5Bi0.5TiO3-(0.6-x)SrTiO3-xPbTiO3 solid solutions (x = 0, 0.05, 0.1, 0.15). The dielectric anomaly increases in the system with respect to the concentration of lead, showing that interactions between dipolar entities are modified. The system exhibits dipolar-glass-like behaviour at low values of x (0⩽x<0.1). Relaxor behaviour emerges in the sample where x=0.1. Furthermore, a spontaneous first-order phase transition from relaxor to normal ferroelectric is observed at x⩾0.15. A few peculiar dispersion regions are observed in the ferroelectric phase, which we attribute to the coexistence of ferroelectric and dipolar glass phases. On the other hand, the nonlinear dielectric response indicates the existence of compressible polar nanoregions as common elementary dipolar entities in both relaxor and glass-like states. Dielectric spectra were approximated with empirical Cole-Cole or Havriliak-Negami equations. It is shown that the temperature dependencies of mean relaxation times, which were obtained from dielectric spectra, follow the Vogel-Fulcher equation in all samples. Moreover, distributions of relaxation times are obtained and a phase diagram is presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 64, February 2014, Pages 123-132
Journal: Acta Materialia - Volume 64, February 2014, Pages 123-132
نویسندگان
Sarunas Svirskas, Maksim Ivanov, Sarunas Bagdzevicius, Jan Macutkevic, Algirdas Brilingas, Juras Banys, Jan Dec, Seweryn Miga, Marija Dunce, Eriks Birks, Maija Antonova, Andris Sternberg,