بررسی ساختاری و مغناطیسی نانوذرات گارنت ایتریوم آهن جانشانی شده با پراسیودیمیم

نویسندگان

دانشگاه آزاد اسلامی

چکیده

نانوپودرهای گارنت ایتریوم آهن با جانشانی پراسیودیمیم و ترکیب PrxY3-xFe5O12 و میزان آلایش 4/0≤x≤0 با استفاده از روش سل- ژل ساخته شدند. ویژگی­های ساختاری و مغناطیسی نمونه­ها با دستگاه­های پراش پرتو ایکس ((XRD، مغناطش­سنج ارتعاشی (VSM) و طیف­سنج Far-FTIR مورد بررسی قرار گرفتند. تحلیل پراش پرتو ایکس نشان می­دهد که با افزایش میزان جانشانی پراسیودیمیم (x) ثابت شبکه افزایش می­یابد. میانگین اندازه­ی بلورک­ها با استفاده از رابطه­ی دبای شرر در گستره­ی 63-55 نانومتر محاسبه شد. همچنین نتایج حاصل از منحنی­های پسماند نشان می­دهد که مغناطش اشباع برای نمونه­­های 2/0x≤ روندی افزایشی و برای 4/0≤x≤3/0 روند کاهشی دارد. این رفتار بر اساس جانشانی یون پارامغناطیسPr+3  در جایگاه دوازده­وجهی، نظریه­ی نیل و کج­شدگی اسپینی مورد بحث قرار گرفتند. تغییرات میدان ابر ریزمغناطیسی، جابه­جایی ایزومری و پهنای شش­تایی وابسته به یون­­های آهن در جایگاه­های چهاروجهی و هشت­وجهی، با استفاده از بیناب­سنج موسبائر (Mössbauer Spectroscopy) مورد بررسی قرار گرفت.       

کلیدواژه‌ها


عنوان مقاله [English]

An investigation on structural and magnetic properties of praseodymium substituted yttrium iron garnet nanoparticles

چکیده [English]

Praseodymium ion (Pr3+) substituted yttrium iron garnet nanoparticles PrxY3-xFe5O12 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were fabricated by the sol-gel method. X-ray diffraction (XRD) patterns confirmed the pure garnet structure for all samples. The chemical bonds and the garnet phase were studied by using Far-FTIR. The magnetic hyperfine parameters were obtained by MÖssbauer spectroscopy and confirmed the VSM results. The results of vibrating sample magnetometer (VSM) represents that saturation magnetization increases with increasing praseodymium ion concentration for the samples with x = 0.0 to x = 0.2 and then decreases up to x = 0.4. These changes assigned to the Neel theory, Pr3+ substituted at c site and the spin canting due to the sublattice splitting.

کلیدواژه‌ها [English]

  • Sol-gel
  • Yttrium Iron Garnet
  • Praseodymium
  • MÖssbauer spectroscopy
  • Vibrating Sample Magnetometer
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