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Ti-Getter가 Ti<SUB>0.96</SUB>Co<SUB>0.02</SUB>Fe<SUB>0.02</SUB>O₂의 자기적 특성에 미치는 영향
남효덕(H. D. Nam),김성진(S. J. Kim),백종근(J. K. Baek),이상률(S. R. Lee),박철수,김응찬(E. C. Kim) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.3
The samples were synthesized by using a solid state reaction. The X-ray diffraction pattern for Ti<SUB>0.96</SUB>Co<SUB>0.02</SUB>Fe<SUB>0.02</SUB>O₂ showed a pure rutile phase with tetragonal structure, Mixtures of the proper proportions of the elements sealed in evacuated quartz ampoule were heated at 870~930 ℃ for one day and then slowly cooled down to room temperature at a rate of 10 ℃/h. In order to obtain single phase material, it was necessary to grind the sample after the first firing and to press the powders into pellets before annealing them for a second time in evacuated and sealed quartz ampoule. Magnetic properties have been investigated using the vibrating sample magnetometer (VSM). Room temperature magnetic hysteresis (M-H) curve showed an obvious ferromagnetic behavior and the magnetic moment per Fe atom under the applied of 0.8 T was estimated to be about 1.5 μB/CoFe. But the magnetic moment per Fe atom under the applied of 0.8 T was estimated to be about 0.02 μB/CoFe without Ti-getter. Size of particles is about 1 ㎛ using the transmission electron microscope (TEM). The ingredients of sample are distributed irregular in particles. Only Fe get shown on the surface of particles.
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