کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7993027 | 1516150 | 2018 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhancement of strain by electrically-induced phase transitions in BNKT-based ceramics
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A series of piezoelectric [Bi0.48(NaxK1-x)0.48Sr0.04](Ti0.977Nb0.023)O3 (BNKT-Nax, xâ¯=â¯0.80-0.88) ceramics were prepared with a pseudocubic phase. Through the selected area electron diffraction (SAED) patterns, it is found that the phase is tetragonal-based when xâ¯=â¯0.80. With the increasing of Na, tetragonal-based phase switches to rhombohedral-based phase. The BNKT-Na0.85 ceramic exhibited a giant field-induced strain of 0.45% at 5â¯kV/mm (900â¯pmâ¯Vâ1). In-situ X-ray diffraction (XRD) and electrical properties examinations were used to identify the main origin of the giant strain and ascertain the evolution of the crystal structure under electric fields. By observing the in-situ XRD of the samples, it can be found that the polar nano-regions orientationally grow along the c-axis and the phase changed from pseudocubic to tetragonal and then from tetragonal to rhombohedral. When removing the field, the phase turned to pseudocubic phase again. The relation between the content of Na and electrical induced phase transitions was further discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 744, 5 May 2018, Pages 535-543
Journal: Journal of Alloys and Compounds - Volume 744, 5 May 2018, Pages 535-543
نویسندگان
Wei Feng, Xiaohui Wang, Zhenyong Cen, Bingcheng Luo, Qiancheng Zhao, Zhengbo Shen, Longtu Li,