تأثیر جانشانی منیزیم و دمای تف‌جوشی بر ویژگی‌های ساختاری و مغناطیسی فریت منگنز- منیزیم

نویسندگان

گروه فیزیک، مجتمع دانشگاهی علوم کاربردی، دانشگاه صنعتی مالک اشتر، شاهین شهر، اصفهان

چکیده

نانوپودرهای فریت منگنز-منیزیم MgxMn1-xFe2O4 که x دارای مقادیر0 تا 1 با گام­های 2/0 است به روش هم­رسوبی تهیه و سپس تحت فشار هیدرولیکی به قرص‌ تبدیل شدند و سرانجام در دماهای 900، 1050 و 1250 درجه ‌سانتی‌گراد تف‌جوش شدند. میکروسکوپ تونلی روبشی اندازه ذرات پودرهای حاصل را در حدود 17 نانومتر نشان داد. الگوهای پراش پرتو ایکس تشکیل ساختار اسپینل مکعبی تک‌فاز را برای نمونه­های تف‌جوش شده در دمای 1250 درجه ‌سانتی‌گراد تأیید نمودند. در این نمونه­ها با جانشانی یونMg2+ به­جای Mn2+، ثابت شبکه از مقدار 49/8 به 35/8 آنگستروم و مغناطش اشباع از مقدار 7/74 به emu/g 2/21 کاهش یافت. هم‌چنین نیروی وادارندگی از مقدار 5 به Oe 23 و دمای کوری از مقدار 269 به 392 درجه ‌سانتی‌گراد افزایش یافت. نمونه­های با x برابر با 2/0 ، 4/0 ، 6/0، تف‌جوش شده در دمای 1250 درجه ‌سانتی‌گراد به‌دلیل ویژگی­های مغناطیسی مناسب، برای کاربردهای هایپرترمیا و جابجاگرهای فازی پیشنهاد می­شوند.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Magnesium Substitution and Sintering Temperature on the Structural and Magnetic Properties of Manganese- Magnesium Ferrite

نویسندگان [English]

  • S.T. Mohammadi Benehi
  • S. Manouchehri
  • M.H. Yousefi
Department of Physics, Faculty of Applied Science, Malek-Ashtar University, Shahin Shahr, Isfahan
چکیده [English]

Magnesium-manganese ferrite nanopowders (MgxMn1-xFe2O4, x=0.0 up to 1 with step 0.2) were prepared by coprecipitation method. The as-prepared samples were pressed with hydrolic press to form a pellet and were sintered in 900, 1050 and 1250˚C. Scanning Tunneling Microscope (STM) images showed the particle size of powders about 17 nm. The X-ray patterns confirmed the formation of cubic single phase spinel structure in samples sintered at 1250˚C. Substituting Mg2+ with Mn2+ in these samples, the lattice parameter decreased from 8.49 to 8.35Å and magnetization saturation decreased from 74.7 to 21.2emu/g. Also, coercity (HC ) increased from 5 to 23Oe and Curie temperature (TC ) increased from 269 to 392˚C. Samples with x= 0.2, 0.4, 0.6 sintered at 1250 ˚C, because of their magnetic properties, can be recommended for hyperthermia applications and for phase shifters.

کلیدواژه‌ها [English]

  • Nanopowder
  • Mn-Mg ferrite
  • Coprecipitation method
  • sintering temperature
  • magnetic properties

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مواد پیشرفته در مهندسی
دوره 35، شماره 3
آذر 1395
صفحه 81-94

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