Influence of oxygen defects on the crystal structure and magnetic properties of the (Tb1-xNax)MnO3-y (0 <= x <= 0.3) system

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題名:	Influence of oxygen defects on the crystal structure and magnetic properties of the (Tb1-xNax)MnO3-y (0 <= x <= 0.3) system
作者:	Chan, T. S.;Liu, R. S.;Yang, C. C.;Li, W.-H.;Lien, Y. H.;Huang, C. Y.;Lynn, Jeff W.;Chen, J. M.;Sheu, H.-S.
貢獻者:	材料所
日期:	2007
上傳時間:	2009-11-13 14:57:41 (UTC+8)
摘要:	The crystallographic and magnetic behaviors of (Tb1-xNax)MnO3-y (0 <= x <= 0.3) have been studied by neutron powder diffraction (NPD), synchrotron X-ray powder diffraction, and Raman spectroscopy techniques. Although Na+ ions have larger ionic radii than Tb3+ ions, analysis of NPD data reveals a decrease in cell volume upon Na-doping, which can be explained solely by the occurrence of oxygen deficiencies and not by the size effect. The Raman spectrum represents the variation in bond length and bond angle, which originates from the balance of ions, asymmetric structure, and defects in the system. Na-doping causes an oxygen deficiency, and consequently, a peak shift is seen in the Raman spectrum because of the structural adjustment resulting from the doping. The observed effective moments decrease with increasing x because of the replacement of Tb3+ ions by Na+ ions. The well-defined peak at similar to 45 K (labeled T-Mn) of the x = 0.3 sample is associated with Mn spin ordering, while the magnetic responses associated with T-Mn are not clearly present in the x = 0.15 and x = 0 samples.
關聯:	INORGANIC CHEMISTRY Volume: 46 Issue: 11 Pages: 4575-4582
顯示於類別:	[化學工程與材料工程學系暨碩士班] 期刊論文

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