Magnetic anomalies, chemical and magnetic properties at wide temperature range (15–1000 K) in LiSrxFe5-xO8 (x = 0, 0.025, 0.05)
作者： S. Udhayakumar , G. Jagadish Kumar , E. Senthil Kumar , M. Navaneethan , K. Kamala Bharathi
DOI: 10.1016/J.JALLCOM.2020.158290
关键词:
摘要: Abstract We report on magnetic anomalies at low temperatures, high Curie temperature values, structural and chemical properties of Sr doped LiFe5O8 bulk material. Micron size LiSrxFe5−xO8 (x = 0, 0.025, 0.05) are seen to crystallize in ordered α-LiFe5O8 phase with the space group P4332. Chemical states Li, Fe, O confirmed from X-ray photoelectron spectroscopy measurements. Domain wall thickness is calculated be 60 nm, 59.4 nm 52.5 nm for x = 0, 0.05 samples respectively. Field cooled (FC) zero field (ZFC) measurements 300 K 15 K shows several samples. Magnetic observed Tm1 (275 K), Tm2 (225 K), Tm3 (125 K), Tm4 (80 K) Tm5 (30 K) pure sample samples, two sharp jumps magnetization around Tm6 (250 K) Tm7 (75 K). Saturation values decrease partial substitution Sr2+ ions Fe3+ structure. Remanent magnetization, magnetocrystalline anisotropy constant (K1) coercivity increase increasing concentration. exhibit temperatures hard behavior substitution.
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