بررسی ویژگی‌های مغناطیسی و بیناب سنجی موسبائر ذرات گارنت ایتریوم آهن بیسموتی Y3-xBixFe5O12 تهیه شده به روش سل-ژل

نویسنده

دانشگاه آزاد اسلامی

چکیده

در این پژوهش ذرات گارنت ایتریوم آهن بیسموتی Y3-xBixFe5O12 با مقادیر جانشانی (3/0 ،2/0 ،1/0 ،0/0) = x  به روش سل-ژل تهیه شدند. تحلیل الگوهای پراش پرتو ایکس (XRD)، ساختار تک فاز اسپینلی را در تمام نمونه ها تایید کرد. چرخه های پسماند به دست آمده از مغناطش سنج ارتعاشی (VSM) نشان دهنده­ی افزایش مغناطش اشباع تا 1/0   x =و سپس یک روند کاهشی در گستره­ی 1/0  x>است. این تغییرات به افزایش برهم­کنش ابرتبادلی و شکافتگی حاصل از کج شدگی اسپینی در هر یک از زیر شبکه­ها نسبت داده شد. همچنین برای دست­یابی به بهترین همخوانی در تحلیل الگوهای بیناب سنج موسبائر (Mössbauer Spectroscopy)، از مدل توزیع تصادفی یون­های Bi3+ در ساختار گارنت ایتریوم آهن (YIG) استفاده شد. این مدل اثر جانشانی یون بیسموت بر تغییر پارامترهای ابر ریز مغناطیسی را توجیه می­کند و تایید کننده­ی نتایج به دست آمده از تحلیل چرخه­های پسماند مغناطیسی است.     

کلیدواژه‌ها


عنوان مقاله [English]

Study of magnetic properties and Mössbauer spectroscopy of Y3-xBixFe5O12 prepared by sol-gel method

چکیده [English]

In this research, Y3-xBixFe5O12 x = (0, 0.1, 0.2, 0.3) were synthesized by a sol–gel method. X-ray diffraction (XRD) patterns confirmed the pure spinel structure for all samples. The magnetic properties of the samples were investigated by the vibration sample magnetometer (VSM). The results obtained from VSM showed that saturation magnetization increases up to
x = 0.1 and then decreases for x>0.1. These variations were attributed to increase of superexchange interaction and spin canting. Furthermore, a model which is based on random distribution of Bi ions in yttrium iron garnet structure was used to achieve the best fit for the Mössbauer patterns. This model explained the effect of Bi substitution on the variation of magnetic hyperfine parameters and also verified the VSM results. 

کلیدواژه‌ها [English]

  • MÖssbauer spectroscopy
  • random distribution model
  • VSM
  • Bi-YIG
  • Sol-gel
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