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- 주제어 : Mg-ferrite (검색결과 6 건)
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원료 분말의 혼합 시간에 따른 소결 Mg-Ferrite의 전기.자기적 특성 변화
김성재,백종규 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.3
As the results of the study on the effects of mixing time for raw materials to the electric and magnetic properties of Mg-ferrite, the fraction of spinel phase after calcination and the geometry density of sintered Mg-ferrite increased from 30% to 100% and from 2.5g/cc to 4.25g/cc respectively due to mixing-homobenity of raw materials. The AC resistivity of grains decreased and lattice parameter, saturation magnetization increased due to the increase in Fe+2 of sintered body. conclusively the characteristic of powder after calcination had strong influence on the microstructure, electric, and magnetic properties in Mg-ferrite sintered body.
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$(Mg_{0.29}-yMnyFe_{0.71})_{3-}\delta$O_4$ 훼라이트계의 상평형
채정훈,유한일,강선호,강대석,유병두 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.3
Electrical conductivity and thermoelectric power of the ferrous ferrite system of (Mg0.29-yMnyFe0.71)3-$\delta$O4 have been measured as function of the thermodynamic variables, cationic composition(y), temperature(T) and oxygen partial pressure(Po2) under thermodynamic equilibrium conditions at elevated temperatures. On the basis of the electrical properties-phase stability correlation, the stability regions of the ferrite spinel and its neighboring phases have been subsequently located in the log Po2 vs. y and log Po2 vs. 1/T planes in the ranges of 0 y 0.29, 1100 T/$^{\circ}C$ 1400 and 10-14 Po2/atm 1. The stability region, Δlog Po2(y, 1/T), of the ferrite spinel single phase widens with increasing Mn-content(y) and the boundaries of each region are linear against 1/T with negative slopes.
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하소온도에 따른 Mg-페라이트 소결체의 미세구조 및 전기.자기적 특성 연구
김성재,정명득,백종규 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.1
Effects of calcination temperature on microstructure and electric-magnetic properties of Mg-ferrite were investigated. As the calcination temperature increase, the green density and the sintered density increase due to the enhancement of densification of calcined powder. The grain size in the sintered ferrite increases with increasing the calcination temperatures from 800 to 100$0^{\circ}C$, but decreases from 1000 to 120$0^{\circ}C$. The resistivity decreases with increasing the calcination temperatures from 800 to 110$0^{\circ}C$, but increases from 1100 to 120$0^{\circ}C$ due to the microstructure which consists of small, uniform grian size and pores at grain boundaries. Magnetization increases slightly due to the increasement of the sintered density while Curie temperature is almost constant regardless of calcination temperatures.
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Mössbauer 분광법에 의한 Ni<SUB>1 − x</SUB>Mg<SUB>x</SUB>Fe₂O₄ Ferrite의 자기구조 연구
윤인섭(In Seop Yoon),백승도(Seung Do Baek) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.3
Ni<SUB>1 ? x</SUB>Mg<SUB>x</SUB>Fe₂O₄ ferrite system was studied by using X-ray diffraction and Mossbauer spectroscopy. The samples were prepared by ceramic sintering method with Mg content x .The X-ray diffraction patterns of samples show phase of cubic spinel structure. There are no remarkable changes of lattice constants in Ni<SUB>1 ? x</SUB>Mg<SUB>x</SUB>Fe₂O₄ ferrite system. The Mossbauer spectra were consisted of two sets of six lines, respectively, corresponding to Fe<SUP>3+</SUP> at tetrahedral and octahedral sites. The magnetic hyperfine field of samples was decreased as increasing Mg contents x in both sites and it was shown Yafet-Kittel magnetic structure. NiFe₂O₄ was shown complete inverse spinel, but MgFe₂O₄ was shown partial inverse spinel which absorption area ratio (oct/tet) was 1.449 in Mossbauer spectrum.
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Seyed Taghi Mohammadi,Mehdi Nazirzadeh,Hassan Nanakar 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
In the present investigation, A series of Mg-Mn ferrite nanopowders with composition MgxMn1-xFe2O4 (with x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by the co-precipitation method. Thereafter, the obtained powders were pressed separately to form pellets, and sintered at 1250 ℃ for 3 h at air atmosphere. Finally, the samples were characterized by X-ray Diffraction (XRD) technique, Scanning Transmission Electron Microscopy (STEM), Alternating Gradient Force Magnetometer (AGFM) and Curie temperature measuring instrument. The lattice constant and distribution of cation in the tetrahedral and octahedral sites have been deduced through XRD data analysis. The XRD pattern confirmed the existence of single phase of cubic spinel crystal structure with the lattice parameter ranging from 8.49 Å (for MnFe2O4) to 8.35 Å (for MgFe2O4). This behavior was attributed to the ionic radii. STEM micrographs exhibit that the particles are spherically shaped and agglomerated with particle size ranging 50–90 nm quite consistent with particle size obtained from XRD data. The average crystallite size was 70nm. Magnetization decreases with increasing Mg concentration except for x = 0.2, where it shows increasing trend. Curie temperature measurements exhibit increasing trend with increase in magnesium content. The variation of the saturation magnetization and Curie temperature with increasing concentration of the Mg2+ ions can be explained on the basis of cation distribution, strengthening A–B interaction and Neel's two sub-lattice.
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미세 구조가 Mg-페라이트 소결체의 자성에 미치는 영향
김성재,정명득,백종규 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.4
Effects of microstructure of two Mg-ferrite specimens with the same starting composition and relative density but with different grain size on B-H hysteresis loop, natural resonance frequency, and ferromagnetic resonance line width are reported. Such properties as B-H hysteresis loop, saturation magnetization, natural resonance frequency, and ferromagnetic resonance line width were influenced by the microstructure development during sintering. Large grain size specimen showed high saturation magnetization, low coercive force, low natural resonance frequency, and low ferromagnetic resonance line width compared with the specimen of small grain size. The main reason for the changes in properties can be explained by the variation in anisotropic characteristics due to Fe+2 content generated during sintering process.
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