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Expanded Graphite 산화물과 자성 나노입자의 복합화와 자기적 특성
노일표(Il Pyo Roh),임현준(Hyun Joon Yim),강명철(Myung Chul Kang),이찬혁(Chan Hyuk Rhee),심인보(In-Bo Shim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.1
The composites of expanded graphite oxide and magnetic nanoparticle (Ni and Co) were synthesized by using simple chemical method. From the raw material natural graphite, the expanded graphite was fabricated using sulfuric acid and 1st heat treatment at 600 ℃ for 1 hour. The expanded graphite was changed to expanded graphite oxide by 2<SUP>nd</SUP> heat treatment at 1050℃ for 15 sec and chemical oxidation. The expanded graphite oxide/1-methyl-2-pyrrolidone solution reacts with the magnetic nanoparticle to form a magnetic graphite oxide composite. These graphite-based materials were characterized by x-ray diffractometer, Raman spectroscopy, transmission electron microscope, and vibration sample magnetometer. We expect that these results of this paper were become basis research of graphite oxide composite.
LiFe<SUB>0.9</SUB>Mn<SUB>0.1</SUB>PO<SUB>4</SUB> 물질의 결정구조 및 뫼스바우어 분광 연구
권우준(Woo Jun Kwon),이인규(In Kyu Lee),이찬혁(Chan Hyuk Rhee),김삼진(Sam Jin Kim),김철성(Chul Sung Kim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.1
The olivine structured LiFe<SUB>0.9</SUB>Mn<SUB>0.1</SUB>PO<SUB>4</SUB> material was prepared by solid state method, and was analyzed by x-ray diffractometer(XRD), superconducting quantum interference devices (SQUID) and Mossbauer spectroscopy. The crystal structure of LiFe<SUB>0.9</SUB>Mn<SUB>0.1</SUB>PO<SUB>4</SUB> was determined to be orthorhombic (space group: Pnma) by Rietveld refinement method. The value of Neel temperature (T<SUB>N</SUB>) for LiFe<SUB>0.9</SUB>Mn<SUB>0.1</SUB>PO<SUB>4</SUB> was determined 50 K. The temperature dependence of the magnetization curves showed magnetic phase transition from paramagnetic to antiferromagnetic at T<SUB>N</SUB> by SQUID measurement. Mossbauer spectra of LiFe<SUB>0.9</SUB>Mn<SUB>0.1</SUB>PO<SUB>4</SUB> showed 2 absorption lines at temperatures above T<SUB>N</SUB> and showed asymmetric 8 absorption lines at temperatures below T<SUB>N</SUB>. These spectra occurred due to the magnetic dipole and electric quardrupole interaction caused by strong crystalline field at asymmetric FeO<SUB>6</SUB> octahedral sites.