توزیع کاتیونی و شاخص وارونگی در نانوفریت‌های اسپینلی چندجزئی AₓB0.5-xZn0.5Fe2O4 (A,B=Ni, Mn, Co) بر پایه‌ی تحلیل داده‌های پراش پرتو X

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیمی، دانشگاه پیام نور، تهران، ایران

2 گروه فیزیک، دانشکده علوم، دانشگاه گلستان، گرگان

10.22128/ijcm.2026.3123.1018

چکیده

در این پژوهش، نانوفریت‌های اسپینلی چندجزئی با ترکیب کلیAₓB0.5-xZn0.5Fe2O4  (A,B=Ni, Mn, Co) در سه مقدار جانشانی x= 0.0, 0.25, 0.5 به روش هم‌رسوبی شیمیایی سنتز و اثر جایگزینی متقابل یون‌های دوظرفیتی بر ساختار بلوری و توزیع کاتیونی بررسی شد. الگوهای پراش پرتوی ایکس (XRD) نشان دادند که همه نمونه‌ها دارای فاز خالص اسپینلی مکعبی هستند. با افزایش x، ثابت شبکه و اندازه نانوبلورک‌ها تغییرهای منظمی دارند که به اختلاف شعاع یونی و تغییر در چگونگی اشغال جایگاه‌های A و B نسبت داده می­شود. بر اساس تحلیل شدت نسبی قله‌های پراش و محاسبه­های نظری، درجه‌ی وارونگی (δ) در گستره‌ی 35/0 تا 45/0 تعیین شد که نشان‌دهنده‌ی ساختار نیمه‌وارون است. رفتار غیرخطی δ با افزایش x به رقابت میان تمایل یون‌های دوظرفیتی برای حضور در جایگاهB  و جابه‌جایی یون­های Fe3+ نسبت داده می­شود. نتایج بیانگر ارتباط یکپارچه میان ترکیب شیمیایی، ثابت شبکه و توزیع کاتیونی است. 

کلیدواژه‌ها

عنوان مقاله [English]

Cation distribution and inversion parameter in multicomponent spinel nanoferrites AₓB0.5-xZn0.5Fe2O4 (A,B=Ni, Mn, Co) based on XRD analysis

نویسندگان [English]

  • Maryam Abareshi 1
  • Hassan Khandan Fadafan 2
1 Department of Chemistry, Payame Noor University, Tehran, Iran
2 Department of Physics, Golestan University, Gorgan, Iran
چکیده [English]

In this study, multicomponent spinel nanoferrites with the general formula AₓB0.5-xZn0.5Fe2O4 (A,B=Ni, Mn, Co) were synthesized by the chemical co-precipitation method at three substitution levels (x = 0.0, 0.25, 0.5) to investigate the effect of divalent ion substitution on crystal structure and cation distribution. XRD patterns confirmed that all samples exhibited a single-phase cubic spinel structure. With increasing x, the lattice parameter and crystallite size showed systematic variations attributed to ionic radius differences and changes in cation site occupancy. Analysis of relative diffraction peak intensities and theoretical calculations revealed that the degree of inversion (δ) ranged from 0.35 to 0.45, indicating a partially inverse structure. The nonlinear behavior of δ with increasing x was ascribed to competition between the preference of divalent ions for B sites and the migration of Fe3+ ions. The results demonstrate a consistent correlation among chemical composition, lattice parameter, and cation distribution.

کلیدواژه‌ها [English]

  • Spinel ferrite
  • cation distribution
  • inversion parameter
  • X-ray diffraction
  • crystal structure

مراجع

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  • تاریخ دریافت: 01 اردیبهشت 1404
  • تاریخ بازنگری: 04 خرداد 1404
  • تاریخ پذیرش: 28 تیر 1404

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