Chemical size effect on the magnetic and electrical properties in the (Tb1-xEux)MnO3 (0 <= x <= 1.0) System

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題名:	Chemical size effect on the magnetic and electrical properties in the (Tb1-xEux)MnO3 (0 <= x <= 1.0) System
作者:	Chan, T. S.;Liu, R. S.;Yang, C. C.;Li, W. -H.;Lien, Y. H.;Huang, C. Y.;Lee, J. -F.
貢獻者:	材料所
日期:	2007
上傳時間:	2009-11-16 10:30:27 (UTC+8)
摘要:	The effect of isovalent chemical substitution of Eu3+ into the Tb3+ sites on the magnetic and electrical properties of (Tb1-xEux)MnO3 (0 <= x <= 1.0) system has been investigated. The orthorhombic structure with space group Pbnm is observed in this series of materials. An increase in Mn-O bond distance with increasing Eu content leads to improvement in the overlap between the Mn 3d and O 2p orbital thereby causing a decrease in activation energy and resistivity. Moreover, as the Eu content increases, the effective moments (mu(eff)) are reduced linearly and an exchange coupling is observed in Tb-Tb, Tb-Eu, and Eu-Eu complexes for x = 0.1 and 0.3 samples. Both these features can be related to the substitution of bigger Eu3+ ions replacing the original Tb-Tb coupling.
關聯:	JOURNAL OF PHYSICAL CHEMISTRY B Volume: 111 Issue: 9 Pages: 2262-2267
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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