Synthesis of Bi₂₅FeO₃₉ by molten salts method and its mössbauer spectrum

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• 作者：Shirley Sara&iacute ; Flores Morales ; Jesú ; s A. Leó ; n Flores ; José ; Luis Pé ; rez Mazariego ; ^{mazariego@ciencias.unam.mx" class="auth_mail" title="E-mail the corresponding author} ; Vivianne Marquina Fá ; brega ; Raú ; l W. Gó ; mez Gonzá ; lez
• 关键词：Mö ; ssbauer spectroscopy ; Molten salts synthesis ; BiFeO3 ; X-ray diffraction ; Sillenite type structure
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：504
• 期：Complete
• 页码：109-111
• 全文大小：280 K

文摘

A sample of <em>Biem>_<em>25em><em>FeOem>_<em>39em> was synthesized by the molten salts method in 2 h at 750 °C with <em>KCl-KBrem> as reaction media. The sample was characterized with X-ray powder diffraction and Mössbauer spectroscopy. The Rietveld refinement of the X-ray diffraction confirms that a sillenite type structure with a cell parameter <em>aem>=10.190(4) Å was achieved, with only small traces of <em>Biem>_<em>2em><em>Oem>_<em>3em>. In order to get a Mössbauer spectrum with a good signal to noise ratio, the synthesis was made using 95% enriched <em>α–em>^<em>57em><em>Feem>_<em>2em><em>Oem>_<em>3em>. To our knowledge, this is the first time that a Mössbauer spectrum for the <em>Biem>_<em>25em><em>FeOem>_<em>39em> has been recorded. The nonappearance of a magnetic sextet confirms its paramagnetic behavior. The measured Mössbauer parameters (IS=0.20±0.004 mm/s and QS=0.2±0.07 mm/s) correspond to Fe⁺³ in very symmetric surroundings, and rule out some interpretations given to the doublet observed in some Mössbauer spectra of <em>BiFeOem>_<em>3em>.