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THE SPIN REORIENTATION AND THE MAGNETIC ANISOTROPY IN R₂Fe17-xMxCy (R=Er, Tm, M=Al, Ga)
K.Ohno,T.Urakabe,M.Agata,T.Saito,K.Shinagawa,T.Tsushima 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
In order to consider the change of the magnetic anisotropy energy by the Al or Ga substitution for Fe, spin reorientation temperature T_(SR) and Curie temperature Tc in R₂Fe_(17-x)Mx, (R=Er, Tm, M=Al, Ga) have been studied both experimentally and theoretically. As a result, T_(SR) and Tc for R₂Fe_(17-x)Al_x, shift toward higher temperature side with x (0≤x≤2.0). The ΔTc, the difference of the Tc's between Er₂Fe_(17-x)Al_x, and Tm₂Fe_(17-x)Al_x, is always about 10 K independent of Al-content. But in the case of Ga substitution, the ΔTc increases with Ga-content ; especially, the ΔTc for x=2.0 is 43 K. This value of the ΔTc is not explained by only the difference of the de Gennes fator G between Er³+ and Tm³+, but it is thought that the values of J_(ErFe) and J_(TmFe) themselves are not equal. (J_(AB): the exchange interaction between A and B.)
A Constitutive Model for Sintering of Granulated Ceramic Powders
Shinagawa, K .,Hirashima, Y . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Sintering behavior of granulated powder is investigated to develop a constitutive model for deformation analysis of ceramic powder compacts during sintering. Spray-dried alumina is compacted by CIPing (cold isostatic pressing) and sintered at various temperatures. Shrinkage and the change in grain size of the compacts during sintering are revealed in relation to the inhomogeneous microstructure consisting of fractured and unfractured granules as a consequence of the compaction. A constitutive model for the ceramic powder compacts having the internal structure is presented. The difference in grain growth in dense and sparse regions of the compacts is taken into consideration to the model. The results calculated by the model show good agreement with that obtained by experiment.