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The structural and magnetic properties of Ni₄₅Al₄₅C₁₀ solid solution as a function of milling times
Kontan Tarigan,Yong-Goo Yoo,Dong-Seok Yang,Ni Luh Karina Kartika,Seong-Cho Yu 한국자기학회 2007 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-
We have studied the formation of alloy for Ni₄?Al₄?C₁? as a function of milling times. This alloy was produced using mechanical alloying. The effect of milling time on local structural changes of Ni₄?Al₄?C₁? has been investigated by means of EXAFS. Both XRD and EXAFS patterns from mechanically alloyed Ni₄?Al₄?C₁? powder indicates the formation of solid solution. The variation of lattice parameter and particle sizes could be analyzed from the different of milling times. Magnetization was also measured by using VSM.
Kontan Tarigan,송영열,유성초,Dwi Nanto 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Nanocrystalline Fe90−xMn10Alx (x = 10, 20, 30, and 40) were prepared via mechanical alloyingby using Fe, Mn, and Al powders with a 48 hours milling time. The structural and the magneticproperties were studied. All X-ray diffraction peaks are broader and shifted to smaller angle withincreasing Al contents, depending on the crystalline size and the lattice parameter. All the samplesexhibit alloys behavior with an average crystallite size around 10 nm. The magnetic saturation,coercivity, and permeability obtained from measurements using a vibrating sample magnetometershowed strong dependences on the Al content and these dependences were related to changes in thestructure and the crystallite size. The hyperfine field obtained from M¨ossbauer spectroscopy variedwith the Fe content. These results suggest that, by adjusting Al, appropriate magnetization valuescan be obtained without affecting the coercivity and the structure of the bcc phase.
Kontan Tarigan,Dong Seok Yang,Seong Cho Yu 한국자기학회 2013 Journal of Magnetics Vol.18 No.1
Structural and magnetic properties of Fe??Mn?? nanocrystalline alloys prepared by the mechanical alloying technique (using commercial Fe and Mn powders as the precursors) are studied as a function of milling time, 1 hr to 48 hrs. The nano-crystallite size and shape are examined by using scanning electron microscopy (SEM). The effect of milling time on structural characterization was investigated using X-ray diffractometer (XRD) and extended X-ray absorption fine structure spectroscopy (EXAFS). Both XRD and EXAFS studies showed that the alloying process should be completed after 36 hrs milling. Concerning the magnetic behavior, the data obtained from superconducting quantum interference devices (SQUID) exhibited both magnetic saturation (Ms) and coercivity (Hc) depend strongly on the milling time, which are related to the changes in the crystallite size and magnetic dilution.