کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8152894 | 1524756 | 2018 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development of (Zr,Mn) doped X-type hexaferrites for high frequency EMI shielding applications
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
X-type hexaferrites with nominal composition of [Ba2(Zr0.5Mn0.5)xFe28âxO44+0.25x] where xâ¯=â¯0, 1.5, 2 and 2.5 were synthesized using solid state reaction technique by applying two different sintering conditions of 1240â¯Â°C and 1300â¯Â°C for 5â¯h. Phase pure single phase formation of the synthesized hexaferrites were observed using XRD analysis. Surface morphologies of the sintered polished samples were analysed using SEM and found non spherical grains. The average grain size found to be â¼472.9â¯nm and â¼858.11â¯nm for the samples sintered using the recipe of 1240â¯Â°C and 1300â¯Â°C for 5â¯h respectively. Moreover, the grain size increases with the increase of (Zr,Mn) dopant concentration for the samples sintered at 1240â¯Â°C for 5â¯h and was found decreasing with the increase of (Zr,Mn) dopant concentration for the samples prepared at 1300â¯Â°C for 5â¯h. The average crystallite size estimated using Scherrer's formula was in the range of 2.4499â¯nm and 2.275â¯nm for the samples sintered at 1240â¯Â°C and 1300â¯Â°C respectively for 5â¯h. Magnetic measurements (M-H) and (M-T) were performed using vibrating sample magnetometer (VSM). Highest remnant magnetization was found for the material (xâ¯=â¯2) irrespective of the sintering conditions. Saturation magnetisation was found decreasing with increasing of temperature in all the studied samples irrespective of the sintering conditions. Coercivity (Hc) of all the samples found decreasing with the increase in (Mn,Zr) dopant concentration. Electromagnetic interference (EMI) absorption was determined using E5063A Network Analyser (ENA) with the frequency range of (300â¯MHz-18â¯GHz). The sample Ba2(Zr0.5Mn0.5)2Fe26O44.5 (xâ¯=â¯2) sintered at 1240â¯Â°C, displayed maximum absorption of â36.2â¯dB (99.975%) at 15.4â¯GHz with the bandwidth that indicate frequency range in which RL was more than â20â¯dB (99% absorption) of 0.7â¯GHz (15.1â¯GHz-15.8â¯GHz). The rest of the studied samples displayed the bandwidth of 1.2â¯GHz (14.4â¯GHz-15.6â¯GHz) for minimum 99% absorption. The sample Ba2(Zr0.5Mn0.5)2Fe26O44.5 (xâ¯=â¯2) sintered at 1300â¯Â°C, displayed maximum absorption of â35.2â¯dB (99.97%) at 16.8â¯GHz with the bandwidth that indicated RL was more than â20â¯dB (99% absorption) of 1.6â¯GHz (16â¯GHz-17.6â¯GHz). Zr,Mn doped X-type hexaferrites showed better absorption properties in high frequency range (Ku band (12-18)â¯GHz) and as a result, it can be used for EMI shielding for high frequency applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 716-726
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 716-726
نویسندگان
Htet Kyaw Ye, S.R. Shannigrahi, C.B. Soh, S.L.W. Yang, L.S. Li, D.V.M. Repka, P. Kumar,