کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9781572 | 1511632 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Proton magnetic resonance study of the phase transitions of [N(CH3)4]2BCl4 (B=59Co, 63Cu, 67Zn, and 113Cd) single crystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Proton magnetic resonance study of the phase transitions of [N(CH3)4]2BCl4 (B=59Co, 63Cu, 67Zn, and 113Cd) single crystals Proton magnetic resonance study of the phase transitions of [N(CH3)4]2BCl4 (B=59Co, 63Cu, 67Zn, and 113Cd) single crystals](/preview/png/9781572.png)
چکیده انگلیسی
The proton spin-lattice relaxation rates in [N(CH3)4]2BCl4 (B=59Co, 63Cu, 67Zn, and 113Cd) single crystals grown using the slow evaporation method were investigated over the temperature range 120-400Â K. It was found that the relaxation processes of 1H for all the [N(CH3)4]2BCl4 crystals can be described with single exponential functions. The changes in the 1H relaxation behavior in the neighborhood of the phase transition temperatures are used to detect changes in the state of internal motion. From the 1H spin-lattice relaxation rate measurements for [N(CH3)4]2BCl4 crystals, the activation energies were calculated for each phase. The large values of the activation energies indicate that the N(CH3)4 groups are significantly affected during the transitions. Although these [N(CH3)4]2BCl4 crystals all belong to the group of A2BX4-type crystals, their 1H spin-lattice relaxation rates have different temperature dependences and indicate the occurrence of different molecular motions within the crystals. We additionally show for the first time that the differences in 1H spin-lattice relaxation rates among the [N(CH3)4]2BCl4 (B=59Co, 63Cu, 67Zn, and 113Cd) single crystals arise from differences in the electron structures of the metal ions within the series.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 66, Issue 10, October 2005, Pages 1795-1800
Journal: Journal of Physics and Chemistry of Solids - Volume 66, Issue 10, October 2005, Pages 1795-1800
نویسندگان
Ae Ran Lim, Won Ki Jung,