DocumentCode
1363647
Title
Nanocrystalline Spinel Mn
Cu
Fe
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 by an advanced sol-gel auto-combustion method. The X-ray diffraction patterns confirm the existence of single-phase cubic spinel crystal structure of ferrites with lattice parameter ranges from 8.395 ?? to 8.45 ??. We report the equilibrium radii for tetrahedral and octahedral sites in the unit cells and the estimated cation distribution over the two sites of nanocrystalline Mn<sub>x</sub>Cu<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub>. We also estimate the oxygen positional parameter as 0.389. The positron annihilation life time spectroscopic studies were carried out for all the samples and analyzed the variation of life time parameters ??<sub>1</sub>; I<sub>1</sub>, ??<sub>2</sub>; I<sub>2</sub> and the mean life time ??<sub>m</sub> to elucidate the defect structure of the nanocrystalline Mn<sub>x</sub>Cu<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub>. We found that the overall vacant type defects fill up as the Mn<sup>2+</sup> ion concentration, x, increases. The value of ??<sub>1</sub> varies from 150 ps to 170 ps and that of ??<sub>2</sub> varies from 295 ps to 335 ps, which are the characteristic values for nanocrystalline samples, indicating the presence of intergranular as well as surface-diffused vacancies in the crystal structure.</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Keywords</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>X-ray diffraction; combustion synthesis; copper compounds; crystal structure; ferrites; lattice constants; manganese compounds; nanostructured materials; nanotechnology; positron annihilation; sol-gel processing; vacancies (crystal); Mn<sub>x</sub>Cu<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub>; Mn<sup>2+</sup> ion concentration; X-ray diffraction; cation distribution; crystal structure; defect structure; equilibrium radii; lattice parameter; nanocrystalline spinel ferrite; octahedral sites; oxygen positional parameter; positron annihilation life time spectroscopy; single-phase cubic spinel crystal structure; sol-gel auto-combustion method; surface-diffused vacancies; tetrahedral sites; time 150 ps to 170 ps; time 295 ps to 335 ps; vacant type defects; Ionic radii; X-ray diffraction; nanocrystalline spinel ferrites; positron annihilation;</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>fLanguage</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>English</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Journal_Title</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>Magnetics, IEEE Transactions on</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Publisher</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>ieee</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>ISSN</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>0018-9464</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Type</span></div><div class='col-12 col-md-9 leftDirection leftAlign'><h2 class='mb-0 fw-semibold'>jour</h2></div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>DOI</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>10.1109/TMAG.2009.2031109</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Filename</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>5232844</div></div>
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