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- W2896568432 abstract "The secondary battery cathode material lithium iron phosphate (LiFePO 4 ) has been studied about performance improvement. Representatively, Li ion or Fe ion of LiFePO 4 were substituted others ion [1]. The starting materials of this sample were FeC 2 O 4 ·2H 2 O, NH 4 H 2 PO 4 , Na(CH 3 COO) and Li 2 CO 3 and synthesized by solid state method. The mixture was calcined at 300 °C for 4 hours under argon atmosphere and sintered at 700 °C for 10 hours under argon atmosphere. The synthesized Li 0 . 99 Na 0.01 FePO 4 sample was measured by XRD (x-ray diffractometer) and analysed by Fullprof program. This sample was determined to be orthorhombic with the space group Pnma. The lattice constants were determined $a_{0}$ = 10.327 A, b o = 6.007 A and $c_{0}$ = 4.693 A. The Bragg factor $R_{mathrm{B}}$ and structure factor $R_{mathrm{F}}$ were about 5%. In order to measured magnetic properties, we measured VSM (vibrating sample magnetometer) and Mossbauer spectra at various temperature from 4.2 to 300 K. The results indicated that Neel temperature $(T_{mathrm{N}})$ and spin reorientation temperature $(T_{mathrm{S}})$ were $T_{mathrm{N}}$ = 50.5 K and $T_{mathrm{S}}$ = 22 K. From analysed Mossbauer spectrum, at 4.2 K, the magnetic hyperfine field $(H_{mathrm{h}mathrm{f}})$ , electric quadrupole splitting $(Delta E_{mathrm{Q}})$ and isomer shift $(delta)$ values was determined to be $H_{mathrm{h}mathrm{f}}=124.53 text{kOe}, Delta E_{mathrm{Q}}$ = 2.74 mm/s, $delta$ = 1.24 mm/s. $theta=0.0^{circ},varphi=0.0^{circ}, eta$ = 0.82 and R = 3.25 and $Delta E_{mathrm{Q}}$ = 2.95 mm/s and $delta$ = 1.11 mm/s at 295 K. The Fe ion state of Li 0.99 Na 0.01 FePO 4 powder sample was Fe2+." @default.
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- W2896568432 date "2016-08-01" @default.
- W2896568432 modified "2023-09-25" @default.
- W2896568432 title "Spin Reorientation of Li<inf>0.99</inf>Na<inf>0.01</inf>FePO<inf>4</inf> with Mössbauer Spectroscopy" @default.
- W2896568432 doi "https://doi.org/10.1109/icaums.2016.8479653" @default.
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