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\begin{document}

\title{M\selectlanguage{ngerman}össbauer study of iron oxide nanoparticles\selectlanguage{english}}



\author[1]{C. Sarafidis}%
\author[1]{C. Karra}%
\affil[1]{Aristoteleio Panepistemio Thessalonikes Tmema Physikes}%


\vspace{-1em}



  
  \date{May 27, 2024}


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\begin{abstract}
Magnetic nanoparticles have recently attracted attention for biochemical
and medical applications like drug delivery and hyperthermia for a
variety of reasons with most important being their stability, chemical
compatibility, and suitable magnetic properties like moderate specific
mass magnetization. Cobalt ferrites are a well-studied family of
materials and the partial substitution of Fe \textsuperscript{3+}
cations by rare earth (RE) ones may be used to tune the magnetic
properties. In the present work pure and substituted Co ferrite
nanoparticles with nominal stoichiometry CoFe \textsubscript{2-x}R
\textsubscript{x}O \textsubscript{4} (R = Yb, Gd; \emph{x} = 0.05, 0.1,
0.3) synthesized by the co-precipitation method are studied with
\textsuperscript{57}Fe M\selectlanguage{ngerman}össbauer spectroscopy in order to determine the
incorporation of RE ions in the spinel lattice. The fitting procedure
was based on the standard spinel model using two sextets for the
octahedral and the tetrahedral coordinated positions of Fe atoms. All
isomer shift values were found within the typical range of high spin
ferric ions while quadrupole splitting values strongly suggest that
there is a substitution preference; RE ions replace iron ones in
octahedral sites. The inversion parameter was found to decrease with RE
content (lowest value about 0.534 for CoFe \textsubscript{1.90}Yb
\textsubscript{0.10}O \textsubscript{4}) and thermal treatment always
results in changing the material towards normal spinel, while pure CoFe
\textsubscript{2}O \textsubscript{4} was inverse. Thermal treatment of
substituted materials in ambient air at temperature range 1500-1700 K
for 12 hours increase crystallite size and changes the degree of
inversion.%
\end{abstract}\selectlanguage{ngerman}%



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\textbf{Hosted file}

\verb`Sarafidis_9_P_paper.docx`  available at \url{https://authorea.com/users/753018/articles/723486-m%C3%B6ssbauer-study-of-iron-oxide-nanoparticles}

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