کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5438361 1398183 2017 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
X-ray diffraction, dielectric and Raman studies of the Ba1−xNaxTi1−x(Nb1−ySby)xO3 ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
X-ray diffraction, dielectric and Raman studies of the Ba1−xNaxTi1−x(Nb1−ySby)xO3 ceramics
چکیده انگلیسی
Ba1−xNaxTi1−x(Nb1−ySby)xO3 (BNTNSO) ceramics with compositions (x=0.05; y=0; 0.10; 0.20 and 0.30) have been prepared by conventional solid-state method and sintered in the temperature range 1350-1400 °C. Phase purity and structure are investigated using X-ray diffraction (XRD) data. The structural study showed that our synthesized compounds are single phase and crystallize in the tetragonal system with P4mm space group at room temperature. Based on a phenomenological model, dielectric and Raman properties of BNTNSO compounds have been explored. Referring to this model, dielectric properties of ceramics have been investigated in broad ranges of temperature (100-500 K) and frequency 1-103 kHz). The dielectric permittivity evolution as a function of temperature and frequency has exhibited a classical ferroelectric character for 0≤y≤0.20 and a relaxor type behavior for y=0.30. The investigation of Raman spectra as a function of temperatures and compositions, confirmed the dielectric behavior. These results indicate that the y=0.20 composition is of extreme significance as far as its technological and industrial applications are concerned, which refers basically to its interesting physical properties and environmentally friendly characters, especially as its transition temperature is equal to the room temperature. The used samples show that the substitution of Nb by Sb favors and maintains the relaxor characters without changing the transition temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 12, 15 August 2017, Pages 8938-8943
نویسندگان
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