کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7914384 | 1510942 | 2018 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the novel double perovskites A2Fe(Mn0.5W0.5)O6 (A= Ca, Sr, Ba). Structural evolution and magnetism from neutron diffraction data
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the novel double perovskites A2Fe(Mn0.5W0.5)O6 (A= Ca, Sr, Ba). Structural evolution and magnetism from neutron diffraction data On the novel double perovskites A2Fe(Mn0.5W0.5)O6 (A= Ca, Sr, Ba). Structural evolution and magnetism from neutron diffraction data](/preview/png/7914384.png)
چکیده انگلیسی
New A2Fe(Mn0.5W0.5)O6 (Aâ¯=â¯Ca, Sr, Ba) double perovskite oxides have been prepared by ceramic techniques. X-ray diffraction (XRD) complemented with neutron powder diffraction (NPD) indicate a structural evolution from monoclinic (space group P21/n) for Aâ¯=â¯Ca to cubic (Fm-3m) for Aâ¯=â¯Sr and finally to hexagonal (P63/mmc) for Aâ¯=â¯Ba as the perovskite tolerance factor increases with the A2+ ionic size. The three oxides present different tilting schemes of the FeO6 and (Mn,W)O6 octahedra. NPD data also show evidence in all cases of a considerable anti-site disordering, involving the partial occupancy of Fe positions by Mn atoms, and vice-versa. Magnetic susceptibility data show magnetic transitions below 50â¯K characterized by a strong irreversibility between ZFC and FC susceptibility curves. The Aâ¯=â¯Ca perovskite shows a G-type magnetic structure, with weak ordered magnetic moments due to the mentioned antisite disordering. Interesting magnetostrictive effects are observed for the Sr perovskite below 10â¯K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 80, June 2018, Pages 72-80
Journal: Solid State Sciences - Volume 80, June 2018, Pages 72-80
نویسندگان
Crisanto A. GarcÃa-Ramos, Sebastián Larrégola, MarÃa Retuerto, MarÃa Teresa Fernández-DÃaz, Kiril Krezhov, José Antonio Alonso,