کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1785488 1023382 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Induced instability in local structure and ferroelectric polarization of rare earth modified BZT relaxor ceramics
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Induced instability in local structure and ferroelectric polarization of rare earth modified BZT relaxor ceramics
چکیده انگلیسی


• Chemically induced instability due to rare earth substitution in BZT relaxor ceramics.
• Substitution induced A-site vacancies and lattice disorder in the perovskite structure.
• Overall properties are correlated with lattice disorder, transition, relaxation and polarization switching mechanism.

Chemically induced instability in local symmetry of rare earth modified barium zirconate titanate relaxor ceramics Ba1-xLn2x/3Zr0.3Ti0.7O3 (Ln = Sc, La, Sm, Nd, Eu and Gd), where x = 0.02–0.10 and its effect on structural, microstructural, interband transition along with ferroelectric switching polarization are studied experimentally. Rare earth substitution induced A-site vacancies and distortion in three dimensional cation-oxygen networks leads to random local strain with short range ordering. In addition, these cations control the formation of grain, grain boundaries and band gap values. Substitution of rare earth ions induced intermediate energy levels in between conduction and valence band and guided the emission spectra towards blue-green region. At room temperature polarization hysteresis loop and normalized capacitance versus electric field loop indicated the existence of relaxation and polarization switching mechanism in these materials. However, at room temperature feeble polarization switching is observed in case of scandium, europium and gadolinium based BZT compositions indicated a weak relaxor phase whereas in lanthanum, samarium, neodymium substituted BZT materials shows a dominating relaxor phases induced by static and dynamic of nano size polar regions separated by non-polar region.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 16, Issue 9, September 2016, Pages 989–1000
نویسندگان
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