Abstract
The crystal structures of LiFe1-xMnxPO4 (x = 0.1, 0.3, 0.5) samples have been characterized with x-ray diffraction (XRD) and were determined to be orthorhombic with space group Pnma by Rietveld refinement method. The temperature dependence of the magnetization curves showed abnormal antiferromagnetic behavior as well as a decrease in Neel temperature (TN) with Mn substitution from superconducting quantum interference device (SQUID) measurement. The magnetization decreases until the temperature reaches the spin-reorientation temperature (TS), and then increases with temperature up to TN. The Mossbauer spectra of the LiFe1-xMnxPO4 show that the magnetic hyperfine field (Hhf) and electric quadrupole splitting (ΔEQ) values change with increasing temperature, compared to values at TS, which is caused by the strong electric crystalline field originating from distorted octahedral symmetry. The decrease in TS of LiFe1-xMnxPO4 can be explained by the Mn-concentration-dependent crystal field and spin-orbit coupling...
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