By Topic

Magnetic Properties of Phospho-Olivine Li(Fe _{1-x} Mn _{x} )PO _{4} Investigated With Mössbauer Spectroscopy

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
In Kyu Lee ; Department of Physics,, Kookmin University,, Seoul, Republic of Korea ; Sam Jin Kim ; Chul Sung Kim

The crystalline structure of the Li(Fe1-xMnx)PO4 (x = 0.0, 0.2) samples was determined to be olivine-type orthorhombic with Pnma space group. The contraction ofunit cell volume from LiFe0.8Mn0.2PO4 (V = 293.296 Å3) to LiFePO4 (V = 291.445 Å3) can be explained by the different ionic radii of high-spin Fe2+ and Mn2+. The temperature-dependent magnetic susceptibility and Curie-Weiss fitted reciprocal susceptibility curves of Li(Fe1-xMnx)PO4 indicates that there are antiferromagnetic ordering with different values of magnetic Neel temperature and effective moment between LiFe0.8Mn0.2PO4 (TN = 49 K, μeff = 5.66μB) and LiFePO4 (TN = 51 K, μeff = 5.37 μB). From the Mossbauer analysis, The distribution of the Mn2+ (3d5) ions in M2 magnetic sites can lead to the reduction of magnetic hyperfine field (Hhf) of LiFe0.8Mn0.2PO4 in Fe2+ (3d6) sites. Also, the isomer shift (δ) and electric quadrupole splitting (ΔEQ) values, increasing with Mn2+ substitution, can be attributed to the decrease of charge density at Fe nucleus ρA (0) due to the 3d-electron penetrating closer to the Fe nucleus with asymmetric charge distribution by the presence of Mn2+ ions on the FeO6 octahedral sites.

Published in:

IEEE Transactions on Magnetics  (Volume:48 ,  Issue: 4 )