کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10626165 | 989643 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and negative thermal expansion property of Y2âxLaxW3O12 (0â¤xâ¤2)
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
Y2âxLaxW3O12 solid solutions were successfully synthesized by the solid state reaction method. The microstructure, hygroscopicity and thermal expansion property of the resulting samples were investigated by X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and thermal mechanical analysis (TMA). Results indicate that the structural phase transition of the Y2âxLaxW3O12 changes from orthorhombic to monoclinic with increasing substituted content of lanthanum. The pure phase can form for 0â¤xâ¤0.4 with orthorhombic structure and for 1.5â¤xâ¤2 with monoclinic one. High lanthanum content leads to a low relative density of Y2âxLaxW3O12 ceramic. Thermal expansion coefficients of the Y2âxLaxW3O12 (0â¤xâ¤2) ceramics also vary from â9.59Ã10â6 Kâ1 to 2.06Ã10â6 Kâ1 with increasing substituted content of lanthanum. The obtained Y0.25La1.75W3O12 ceramic shows almost zero thermal expansion and its average linear thermal expansion coefficient is â0.66Ã10â6 Kâ1 from 103 °C to 700 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 39, Issue 3, April 2013, Pages 2781-2786
Journal: Ceramics International - Volume 39, Issue 3, April 2013, Pages 2781-2786
نویسندگان
Hongfei Liu, Zhiping Zhang, Wei Zhang, Xianghua Zeng, Xiaobing Chen,