کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9784067 | 1512028 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polar nanodomains and relaxor behaviour in (1 â x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 crystals with x = 0.3-0.5
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Phase transitions and dielectric properties of the (1 â x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 crystals with x = 0.3-0.5 are studied. The solid solutions in this composition range are shown to be relaxor ferroelectrics. The crystals with low x demonstrate a diffused maximum in the temperature dependences of the dielectric permittivity at Tm. Tm varies with frequency according to the Vogel-Fulcher law. The polarizing microscopy investigations reveal a first-order phase transition from the relaxor phase to the low-temperature ferroelectric phase at TC, which is several degrees below Tm. The permittivity peak in the crystals with x = 0.5 is sharp, and Tm is equal to TC and does not depend on frequency, as is typical of the transition from a ferroelectric to an ordinary paraelectric phase. Nevertheless, the relaxor, but not the paraelectric, phase is observed at T > Tm. This conclusion is confirmed by the observation of the temperature behaviour of complex dielectric permittivity at T > Tm, which is typical of relaxors and related to the existence of polar nanodomains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 120, Issues 1â3, 15 July 2005, Pages 206-209
Journal: Materials Science and Engineering: B - Volume 120, Issues 1â3, 15 July 2005, Pages 206-209
نویسندگان
A.A. Bokov, H. Luo, Z.-G. Ye,