کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10632095 | 992385 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1âxSrxCoO3âδ (Ln = La, Pr and Nd; x > 0.60)
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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: Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1âxSrxCoO3âδ (Ln = La, Pr and Nd; x > 0.60) Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1âxSrxCoO3âδ (Ln = La, Pr and Nd; x > 0.60)](/preview/png/10632095.png)
چکیده انگلیسی
A family of Sr-doped perovskite compounds Ln1âxSrxCoO3âδ (Ln = La3+, Pr3+ and Nd3+; x > 0.60), were prepared by sol-gel chemistry and reaction at 1100 °C under 1 atm of oxygen. This structural family has been shown to be present only for rare earth ions larger than Sm3+ and an upper limit of Sr2+ solubility in these phases was found to exist between x = 0.90 and 0.95. X-ray diffraction shows oxygen-deficient, simple cubic (Pm-3m) perovskite crystal structures. The combination of electron and powder neutron diffraction reveals that oxygen vacancy ordering occurs, leading to a tetragonal (P4/mmm) superstructure and a doubling of the basic perovskite unit along the crystallographic c-axis. No additional Ln3+/Sr2+ cation ordering was observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 40, Issue 6, 15 June 2005, Pages 990-1000
Journal: Materials Research Bulletin - Volume 40, Issue 6, 15 June 2005, Pages 990-1000
نویسندگان
M. James, T. Tedesco, D.J. Cassidy, R.L. Withers,