کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8001088 | 1516278 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structures, phase stability, and dielectric properties of (1âx) Bi3/2MgNb3/2O7âx Bi2Zn2/3Nb4/3O7 ceramics
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Crystal structures, phase stability, and dielectric properties of (1âx) Bi3/2MgNb3/2O7âx Bi2Zn2/3Nb4/3O7 ceramics Crystal structures, phase stability, and dielectric properties of (1âx) Bi3/2MgNb3/2O7âx Bi2Zn2/3Nb4/3O7 ceramics](/preview/png/8001088.png)
چکیده انگلیسی
The preparation, crystal structures, phase stability and dielectric properties of the (1âx) Bi3/2MgNb3/2O7âx Bi2Zn2/3Nb4/3O7 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) ceramics were investigated systematically. The sol-gel process was employed to produce crystalline, single-phase Bi1.5Mg1.0Nb1.5O7 (BMN) and Bi2(Zn2/3Nb4/3)O7 (β_BZN) pre-nanopowders for the synthesis of the ceramics. X-ray diffraction data indicated that these ceramics presented a phase transition for Bi3+ and Zn2+-rich specimens (x ⩾ 0.6), from cubic pyrochlore to orthorhombic zirconolite-like structure. The tolerance factor (t) combined with rA/rB value and the lattice energy (U) were employed to provide an indication of the structural stability of the (1âx) BMN-x β_BZN cubic pyrochlores (x ⩽ 0.4). The tolerance factor (t) calculation contain more structural information, which gives further insight into the details of the structural stability features in the (1âx) BMN-x β_BZN cubic pyrochlores. The relationships between the crystal structures and dielectric properties of the ceramics were determined, and the dielectric loss was related to the phase stability of the system. It is suggested that the dielectric properties are mainly determined by the phase structure, composition and stability in the (1âx) BMN-x β_BZN system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 615, 5 December 2014, Pages 433-439
Journal: Journal of Alloys and Compounds - Volume 615, 5 December 2014, Pages 433-439
نویسندگان
H.L. Dong, L.X. Li, Y.X. Jin, S.H. Yu, D. Xu,