عنوان :
ساخت نانو ذرات فريت باريم و بررسي اثر آلايش عنصر سريوم بر خواص ساختاري و مغناطيسي نانو ذرات تهيه شده
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك
صفحه شمار :
[نه]،102ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
پرويز كاملي
توصيفگر ها :
جذب مايكروويو
تاريخ نمايه سازي :
6/12/92
استاد داور :
هادي سلامتي، حسين احمدوند
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Preparation of Barium Ferrite Nanoparticles and Study of the Ce Doping on Structural and Magnetic Properties of Prepared Nanoparticles Zahra Mosleh Email adderss z mosleh@ph iut ac ir Date of Submission 2013 07 22 Department of Physics Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Parviz Kameli Kameli@cc iut ac ir Abstract In the present work barium hexaferrite nanoparticles were synthesized through a co precipitation route in the presence of a high concentration hydroxide ion at low temperature The effect of annealing temperature on structure morphology and magnetic properties of nanoparticles was investigated by x ray diffraction XRD Fourier transform infrared FTIR field emission scanning electron microscopy FE SEM and vibrating sample magnetometer VSM XRD pattern of the samples along with FTIR analysis confirmed the formation of crystalline hexagonal ferrite phase for powders annealed above 700 C The FE SEM images showed that the particle size increased from few nanometers to micrometers by elevating the annealing temperature from 90 to 1200 C The VSM results revealed that by increasing annealing temperature magnetization and coercivity increased and reached the maximum value of 46emu g 1 and 5278Oe respectively for the sample annealed at 900 C Also the low temperature 90 C and 500 C annealed samples were superparamagnetic at room temperature due to their near zero coercivity and remanence In the second part of project the effect of Ce doping on structural and magnetic properties of nanoparticles was investigated XRD pattern of the samples along with FTIR analysis confirmed the formation of crystalline hexagonal ferrite phase at 1100 oC The magnetic properties of samples indicate that with the Ce doping the saturation magnetization Ms and coercivity Hc show increasing decreasing behavior and the magnetic properties of BaFe12O19 improved by Ce doping Moreover Ce substitutant have special effect on microwave absorbance in barium place Keywords Barium ferrite Cerium Ce Magnetic properties Microwave absorption PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
پرويز كاملي
استاد داور :
هادي سلامتي، حسين احمدوند
