کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9808724 | 1517355 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
(Na0.5K0.5)NbO3-LiTaO3 lead-free piezoelectric ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: (Na0.5K0.5)NbO3-LiTaO3 lead-free piezoelectric ceramics (Na0.5K0.5)NbO3-LiTaO3 lead-free piezoelectric ceramics](/preview/png/9808724.png)
چکیده انگلیسی
Lead-free piezoelectric ceramics were prepared in the system (1âx)(Na0.5K0.5)NbO3-xLiTaO3 following the conventional mixed oxide route. The effect of cationic substitution of lithium for sodium and potassium in the A sites and tantalum for niobite in the B sites in (Na0.5K0.5)NbO3 (NKN) perovskite lattice on symmetry and physical properties were investigated. The materials with perovskite structure are in orthorhombic phase when x<5 mol.% and transform to tetragonal phase when x>6 mol.%; when xâ¥8 mol.%, a K3Li2Nb5O15 phase with tetragonal tungsten bronze structure begins to appear and becomes dominant with increasing content of LiTaO3. A morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases appears at x=5-6 mol.%. Analogous to Pb(Zr,Ti)O3, the piezoelectric and electromechanical properties are enhanced for compositions near the morphotropic phase boundary. Piezoelectric constant d33 values reach â¼200 pC/N. Electromechanical coefficients of planar mode reach â¼36%, respectively. Our results show that (Na0.5K0.5)NbO3 with small amount of LiTaO3 (x=7 mol.%) is a good lead-free piezoelectric ceramic.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 59, Issues 2â3, February 2005, Pages 241-244
Journal: Materials Letters - Volume 59, Issues 2â3, February 2005, Pages 241-244
نویسندگان
Yiping Guo, Ken-ichi Kakimoto, Hitoshi Ohsato,