کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1605239 | 1516209 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modification of strain and piezoelectricity in (K,Na)NbO3-(Bi,Na)HfO3 lead-free ceramics with high Curie temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, the (1-x)K0.45Na0.55NbO3-xBi0.5Na0.5HfO3 lead-free ceramics with a high Curie temperature were prepared by the normal sintering, and the enhancement in strain and piezoelectricity can be attained by tailoring the corresponding compositions. The orthorhombic-tetragonal (OT) phase coexistence was observed in the ceramics with 0.03 < x < 0.055, and then such a phase boundary was reasonably identified by X-ray diffraction patterns as well as temperature -dependent Raman spectra and dielectric constant. A large piezoelectric constant (d33) of â¼385 pC/N and a high Curie temperature (TC) of â¼315 °C can be simultaneously induced in the ceramics with x = 0.05. More interestingly, a high unipolar strain of â¼0.187% was shown in the ceramics with x = 0.04. It was found that the enhanced piezoelectric properties should be attributed to the two phase coexistence as well as enhanced dielectric and ferroelectric properties. We believe that this material is one of the most promising candidates in the field of high-temperature piezoelectrics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 684, 5 November 2016, Pages 217-223
Journal: Journal of Alloys and Compounds - Volume 684, 5 November 2016, Pages 217-223
نویسندگان
Hong Tao, Jiagang Wu, Hui Wang,