کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1627287 | 1516449 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Theoretical investigations on the local structures and the g factors of three Ni3+ centers in LaSrAl1âxNixO4
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Theoretical investigations on the local structures and the g factors of three Ni3+ centers in LaSrAl1âxNixO4 Theoretical investigations on the local structures and the g factors of three Ni3+ centers in LaSrAl1âxNixO4](/preview/png/1627287.png)
چکیده انگلیسی
The local structures and the EPR g factors of three Ni3+ centers (1)-(3) in LaSrAl1âxNixO4 (LSAN) are theoretically investigated from the perturbation formulas of the g factors for a 3d7 ion of low spin (S = 1/2) in tetragonally and orthorhombically distorted octahedra. In these formulas, the contributions to the g factors from the low symmetrical parts of the crystal-fields, characterized by the crystal-field parameters Ds, Dt, Dξ and Dη are taken into account. Based on the studies, it is found that the ligand octahedra are elongated along [0 0 1] axis by about 0.9, 0.7 and 1.0% for centers (1)-(3). The above distortions have a Jahn-Teller nature instead of ordinary lattice deformation, leading to the ligand octahedra less elongated than that (â1.3%) in the host. Apart from the axial elongation, center (3) suffers additional orthorhombic distortion due to inequivalent variation by about ±0.3% of the planar bonding lengths along [1 0 0] and [0 1 0] axes, respectively. The calculated g factors show good agreement with the observed values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 424, Issues 1â2, 9 November 2006, Pages 55-59
Journal: Journal of Alloys and Compounds - Volume 424, Issues 1â2, 9 November 2006, Pages 55-59
نویسندگان
Shao-Yi Wu, Xiu-Ying Gao, Ji-Zi Lin, Qiang Fu,