کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
144649 438942 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and magnetic properties of nanocrystalline yttrium substituted cobalt ferrite synthesized by the citrate precursor technique
ترجمه فارسی عنوان
خصوصیات ساختاری و مغناطیسی فریت کبالت جایگزین یتیم نانوکریستالیک سنتز شده توسط روش پیشکسوت سیترات
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• A single phase sample of yttrium substituted cobalt ferrite has been synthesized.
• Highest magnetization and anisotropy constant decreased with Y3+ substitution.
• Coercivity increases with Y3+ substitution reflecting magnetic single domain state.

CoFe2−xYxO4 (x = 0.0 and 0.05) compound has been synthesized by citrate precursor method and, their structural and magnetic properties have been investigated. X-ray diffraction and Raman spectroscopy have been used to confirm the formation of single phase cubic spinel structure. The X-ray diffraction patterns have been analyzed employing Rietveld refinement technique. The surface morphology and particle size of the samples have been examined using FE-SEM and TEM. Substituting small amount of Y3+ cation causes significant reduction of the particle size. The magnetic hysteresis curve recorded at room temperature using VSM over a field range of ±2 T shows enhancement in coercivity and reduction in highest magnetization with the Y3+ substitution. The enhancement of coercivity is attributed to the transition from multidomain to single domain state. The cubic magnetocrystalline anisotropy constants for present samples has been determined by “law of approach” to saturation which suggests the smaller value for substituted sample (x = 0.05) than that of unsubstituted sample (x = 0.0). ZFC and FC magnetization measurement over the temperature range 300–900 K shows blocking temperature is far above than room temperature. The decrease of highest magnetization and magnetocrystalline anisotropy constant is ascribed to weakening of superexchange interaction and surface effect.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 26, Issue 1, January 2015, Pages 213–223
نویسندگان
, , , , ,