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標題: Structural and magnetic properties of Mg(In(2-x)Mn(x))O(4) system
作者: Tai, M.F.
Lee, T.Y.
Lee, M.W.
關鍵字: MgIn(2)O(4);MgMn(2)O(4);Magnetic semiconductors;Mn doping;Spinel;structure;Magnetic properties
Project: Journal of Magnetism and Magnetic Materials
期刊/報告no:: Journal of Magnetism and Magnetic Materials, Volume 304, Issue 1, Page(s) E176-E178.
We synthesized the Mn-doped Mg(In(2-x)Mn(x))O(4) oxides with 0.03 <= x <= 0.55 using a solid-state reaction method. The X-ray diffraction patterns of the samples were in a good agreement with that of a distorted orthorhombic spinel phase. Their lattice parameters and unit-cell volumes decrease with x due to the substitution of the smaller Mn(3+) ions to the larger In(3+) ions. The undoped MgIn(2)O(4) oxide presents diamagnetic signals for 5K <= T <= 300 K. The M(H) at T = 300 K reveals a fairly negative-sloped linear relationship. Neither magnetic hysteresis nor saturation behavior was observed in this parent sample. For the Mn-doped samples, however, positive magnetization were observed between 5 and 300 K even if the x value is as low as 0.03. The mass susceptibility enhances with Mn content and it reaches the highest value of 1.4 x 10(-3) emu/g Oe (at T = 300 K) at x = 0.45. Furthermore, the Mn-doped oxides with x = 0.06 and 0.2, respectively, exhibit nonlinear magnetization curves and small hysteretic loops in low magnetic fields. Susceptibilities of the Mn-doped samples are much higher than those of MnO(2), Mn(2)O(3) oxides, and Mn metals. These results show that the oxides have potential to be magnetic semiconductors. (C) 2006 Elsevier B. V. All rights reserved.
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2006.02.079
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