کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10713960 | 1025561 | 2012 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of the magnetic and structural properties of Mn-, Fe-, and Co-doped ZnO powder
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A study of the magnetic and structural properties of Zn1âxMxO powder (where x=0 or 0.01, and M=Mn, Fe or Co) produced by the proteic sol-gel process was undertaken. The sample crystal structure was analyzed by XRD and magnetic measurements were carried out in a SQUID magnetometer. Of the XRD analysis, all samples had hexagonal wurtzite crystal structure with P63mc space group, and no secondary phase was observed. It is observed of the M(H) measures at 2Â K, that the Co- and Mn-doped ZnO displayed saturation magnetizations (Ms) of approximately 2 and 3.2Â emu/g, respectively, and no remanence (Mr) was observed, indicating a superparamagnetic behavior in these samples. However, the Fe-doped sample showed a ferromagnetic behavior with Msâ¼0.34Â emu/g, Mrâ¼0.05Â emu/g, and coercivity (Hc)â¼1090Â Oe. Already at room temperature, the M(H) measurements reveal a purely paramagnetic behavior for Mn- and Fe-doped ZnO, indicating that the Curie temperature (Tc) is below 300Â K. However, a weak superparamagnetic behavior was observed in the Co-doped sample, indicating that Tc>300Â K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 407, Issue 16, 15 August 2012, Pages 3229-3232
Journal: Physica B: Condensed Matter - Volume 407, Issue 16, 15 August 2012, Pages 3229-3232
نویسندگان
Daniel A.A. Santos, Marcelo A. Macêdo,