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- 저자 : A.S. Volegov (검색결과 2 건)
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Magnetic and magnetothermal properties of Gd75Cu25 prepared by melt-spinning
D.A. Shishkin,A.S. Volegov 한국물리학회 2020 Current Applied Physics Vol.20 No.11
Magnetic and magnetothermal properties of melt-spun Gd75Cu25 alloy were studied. A second-order magnetic phase transition is observed at the Curie temperature of 144 K. The peak value of the magnetic entropy change ΔSpk m = 7.0 J kg 1 K 1 is observed near the Curie point under the magnetic field change 0–5 T, while the refrigerant capacity is found to be 594 J kg 1. The specific heat exhibits a wide transition near the Curie temperature, and the non-magnetic contributions to the total specific heat are described using the Debye temperature ΘD = 155 K and the electronic specific heat coefficient γ = 65 mJ mol 1 K 2.
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Urusova, N.,Semkin, M.,Kratochvilova, M.,Barykina, J.,Volegov, A.,Park, J.-G.,Lee, S.,Pirogov, A. Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.781 No.-
<P><B>Abstract</B></P> <P>Lithium orthophosphates of the Li<I>M</I>PO<SUB>4</SUB> type (<I>M</I> = Ni, Co, Fe, and Mn) gain intensive development due to the potential applications as electrodes for lithium-ion batteries. The other remarkable property of Li<I>M</I>PO<SUB>4</SUB> is the multiferroicity. We present a study of the crystal structure and magnetic properties, refined anisotropic thermal coefficients and Li-ion migration maps of the LiNi<SUB>0.9</SUB> <I>M</I> <SUB>0.1</SUB>PO<SUB>4</SUB> (<I>M</I> = Co, Mn) single crystals and compared results for the undoped LiNiPO<SUB>4</SUB> and LiMnPO<SUB>4</SUB> ones. All samples have been synthesized by the flux method. In LiNi<SUB>0.9</SUB> <I>M</I> <SUB>0.1</SUB>PO<SUB>4</SUB> (<I>M</I> = Co, Mn), doping increases the lattice constants, unit cell volume, valence bonds, and the anisotropic thermal coefficients. By means of X-ray diffraction and the program package TOPOS, the Li-cation migration maps were obtained. The Li-ions move along the [010] direction which can be clearly visualized in the mixed-metal LiNi<SUB>0.9</SUB> <I>M</I> <SUB>0.1</SUB>PO<SUB>4</SUB> (<I>M</I> = Co, Mn) single crystals. It was found that the 10% doping of LiNiPO<SUB>4</SUB> by cobalt ions leads to a decrease in the formation temperature and to the suppression of the incommensurate phase. The 10% doping of manganese ions increases the transition temperature, while the temperature range of the incommensurate phase narrows.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Structure of Li<I>M</I>PO<SUB>4</SUB> has been refined using single crystal X-ray diffractometer. </LI> <LI> Using Voronoi–Dirichlet approach, the Li-ion migration map was obtained. </LI> <LI> The magnetic phase transition temperatures of Li<I>M</I>PO<SUB>4</SUB> single crystals were determined. </LI> <LI> Co- and Mn-doped LiNiPO<SUB>4</SUB> leads to suppression of the incommensurate phase. </LI> </UL> </P>
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