NDLI: Mössbauer studies of Fe2 + and Fe3 + mixed state in ilmenite

Content Provider	Springer Nature Link
Author	Kim, Woochul Moon, Seung Je Kim, Chul Sung
Copyright Year	2008
Abstract	The 0.9FeTiO3–0.1Fe2O3 solid solution was prepared by solid state reaction with FeTiO3 and α-Fe2O3 powders, and studied by x-ray diffraction, Mössbauer spectroscopy, and vibrating sample magnetometer (VSM). The crystalline structure was found to be single phase rhombohedral structure with lattice constant a = 5.089 Å and c = 14.051 Å. Mössbauer spectra of 0.9FeTiO3–0.1Fe2O3 solid solution were taken at various temperatures ranging from 4.5 to 300 K. The anomalous absorption curves at low temperature are observed. Mössbauer spectra at 4.5 K was fitted to four six-line hyperfine pattern with magnetic hyperfine fields H hf = 504, 424, 115, and 58 kOe, respectively. At 40 K the spectrum shows the mixture of ferromagnetic six-line pattern and paramagnetic two-line and above 50 K it show asymmetry two-line patterns. The fitted curves at room temperature are obtained by superimposing two doublets corresponding to Fe2 + and Fe3 +. The isomer shift δ and quadrupole splitting ΔE Q of sample are 0.92 and 0.69 mm/s for Fe2 + and 0.14 and − 0.29 mm/s for Fe3 +, respectively. Corresponding relative absorption subspectral areas are 89.2% for Fe2 + and 10.8% for Fe3 +. Magnetization measurements indicate ferromagnetic behaviour with 92 Oe coercivity value at 50 K but at 300 K it show no hysteresis loop.
Starting Page	167
Ending Page	171
Page Count	5
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	185
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-10-16
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Mössbauer spectroscopy Ilmenite Hematite Surfaces and Interfaces, Thin Films Condensed Matter Atoms, Molecules, Clusters and Plasmas Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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