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Oxygen Vacancy and Magnetism of a Room Temperature Ferromagnet Co-doped TiO2
Ikuo Nakai,M. Sasano,K. Inui,T. Korekawa,H. Ishijima,H. Katoh,Y. J. Li,M. Kurisu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report the local structure and the magnetic properties of a Co-doped TiO2 prepared by usingthe solid state reaction of milling with subsequent annealing. The Co-doped TiO2 shows a hysteresisbehavior in the magnetization curve at room temperature, which maintains the same rutile-typestructure as that of the starting material TiO2. The extended x-ray absorption fine structuremeasurement reveals that it contains some oxygen vacancies only around a Co atom which occupiesa Ti site. This supports the oxygen vacancy mediated ferromagnetic exchange mechanism.
Fabrication of Deep-Sub-Millimeter-Thick Compacts Using Spark Plasma Sintering
Ohashi T.,Tanaka T.,Oshiro K.,Fujimori H.,Kurisu H.,Matsuura M.,Yamamoto S. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Nd-Fe-B type powder was sintered using spark plasma sintering method. Fabricated compact sintered at the temperature of , is found to be a composite magnet with Nd-Fe-Co-B and . The compact sintered at shows slightly low coercivity and large remanent magnetization comparing to the compact sintered at due to the formation of phase, resulting in the large maximum energy product. Maximum energy product tends to decrease with decreasing thickness of sintered compacts below 0.5 mm in thickness.
Low-Temperature Thermoelectric Properties of Zn<sub>4</sub>Sb<sub>3</sub> Prepared by Hot Pressing
Kim, Il Ho,Park, J.B.,Hong, Tae Whan,Ur, Soon Chul,Lee, Young Geun,Ryu, Sung Lim,Nakamoto, G.,Kurisu, M. Trans Tech Publications, Ltd. 2006 Materials science forum Vol.510 No.-
<P>Zn4Sb3 was successfully produced by a hot pressing technique, and its thermoelectric properties were investigated in the temperature range from 4K to 300K. The Seebeck coefficient, electrical conductivity, thermal conductivity, and thermoelectric figure of merit showed a discontinuity in variation at 242K, indicating the α-Zn4Sb3 to β-Zn4Sb3 phase transformation. Lattice thermal conductivity was found to be dominant in the total thermal conductivity of Zn4Sb3. Therefore, it is expected that thermoelectric properties can be improved by reducing the lattice thermal conductivity inducing phonon scattering centers.</P>