کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7994394 | 1516157 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The giant strain response mechanism in textured Mn-modified 0.925(Bi0.5Na0.5)TiO3-0.075BaTiO3 relaxor ferroelectric ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This work highlights structural and domain evolution, orbital hybridization, and giant strain in the textured [(Bi1/2Na1/2)0.925Ba0.075](Ti0.998Mn0.002)O3 (BNT-7.5BT-0.2%Mn) ceramics. The as-sintered textured specimens reveal a predominant tetragonal P4bm (fractionâ¼94.4%) phase with a minor rhombohedral R3c (fractionâ¼1.4%) phase. X-ray absorption spectra indicate reduced hybridization between the O 2p and the Na 3sp/Bi 6sp/Ti 3d orbitals, implying decreased atomic bonding due to Mn doping. A mixture of Mn2+, Mn3+, and Mn4+ valence states was identified in the ceramic matrix. In-situ electric (E)-field dependent XRD results show a reversible E-field-induced phase transition, suggesting an ergodic relaxor ferroelectric. An E-field-induced giant strain of â¼0.495% at room temperature is attributed to the oriented relaxor ferroelectric P4bm phase and decreased bonding strength, which facilitate a transition from relaxor to ferroelectric phase. The poled specimen at Eâ¯=â¯60â¯kV/cm shows a structural transition sequence of tetragonal P4bm + rhombohedral R3cââ¼220°C tetragonal P4bmââ¼483°C cubic.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 737, 15 March 2018, Pages 705-717
Journal: Journal of Alloys and Compounds - Volume 737, 15 March 2018, Pages 705-717
نویسندگان
Pin-Yi Chen, Cheng-Sao Chen, Chi-Shun Tu, Ya-Syuan Wu, Wei Sea Chang, Shih-Hsun Chen,