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http://dx.doi.org/10.4283/JKMS.2012.22.1.015

Studies on Crystallographic and Mossbauer Spectra of the LiFe0.9Mn0.1PO4  

Kwon, Woo-Jun (Department of Physics, Kookmin University)
Lee, In-Kyu (Department of Physics, Kookmin University)
Rhee, Chan-Hyuk (Department of Physics, Kookmin University)
Kim, Sam-Jin (Department of Physics, Kookmin University)
Kim, Chul-Sung (Department of Physics, Kookmin University)
Publication Information
Journal of the Korean Magnetics Society / v.22, no.1, 2012 , pp. 15-18 More about this Journal
Abstract
The olivine structured $LiFe_{0.9}Mn_{0.1}PO_4$ material was prepared by solid state method, and was analyzed by x-ray diffractometer (XRD), superconducting quantum interference devices (SQUID) and Mossbauer spectroscopy. The crystal structure of $LiFe_{0.9}Mn_{0.1}PO_4$ was determined to be orthorhombic (space group: Pnma) by Rietveld refinement method. The value of N$\acute{e}$el temperature ($T_N$) for $LiFe_{0.9}Mn_{0.1}PO_4$ was determined 50 K. The temperature dependence of the magnetization curves showed magnetic phase transition from paramagnetic to antiferromagnetic at $T_N$ by SQUID measurement. M$\ddot{o}$ssbauer spectra of $LiFe_{0.9}Mn_{0.1}PO_4$ showed 2 absorption lines at temperatures above $T_N$ and showed asymmetric 8 absorption lines at temperatures below $T_N$. These spectra occurred due to the magnetic dipole and electric quardrupole interaction caused by strong crystalline field at asymmetric $FeO_6$ octahedral sites.
Keywords
$LiFe_{0.9}Mn_{0.1}PO_4$; asymmetry octahedral sites; strong crystalline field; Mossbauer spectroscopy;
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