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Low dimensional systems
Mössbauer and magnetic studies of the phase state of SrFe$_{12}$O$_{19}$/La$_{0.9}$Ca$_{0.1}$MnO$_{3}$ composites
A. S. Kamzina,
P. Lampen-Kelleyb,
M. H. Phanb a Ioffe Institute, St. Petersburg
b University of South Florida, Department of Physics, Tampa, USA
Abstract:
The formation of an intermediate phase in SrFe
$_{12}$O
$_{19}$/La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ composites was demonstrated for the first time using only Mössbauer spectroscopy. The SrFe
$_{12}$O
$_{19}$/La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ composite was prepared by the two-stage (sol–gel and hydrothermal) synthesis with varying initial conditions. The X-ray diffraction studies showed that the composite consisted of two phases: well-formed structures of manganite La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ and hexagonal ferrite SrFe
$_{12}$O
$_{19}$. It was found that nanocrystalline La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ particles with size
$d\lesssim$ 150 nm formed in the composites at the surface of plate-like SrFe
$_{12}$O
$_{19}$ crystallites. The Mössbauer studies showed that the composite contained additional (intermediate) phase La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ that formed at the interface between SrFe
$_{12}$O
$_{19}$ and La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ phases. The intermediate phase concentration increased with the molar content of La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$; in this case, the fraction of the surface of SrFe
$_{12}$O
$_{19}$ crystallites coated with La
$_{0.9}$Ca
$_{0.1}$MnO
$_{3}$ increased, which led to the increase in the total area of the interface surface and the intermediate phase concentration.
Keywords:
Manganite, Magnetic Study, Molar Proportion, Hard Magnetic Material, Hyperfine Interaction Parameter. Received: 24.09.2015
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