Open AccessChemical Size Effect on the Magnetic and Electrical Properties in the (Tb1-xEux)MnO3 (0 ≤ x ≤ 1.0) System
Author(s) -
TingShan Chan,
RuShi Liu,
ChunChuen Yang,
W.-H. Li,
Yi-Jyun Lien,
C. Y. Huang,
J.-F. Lee
Publication year - 2007
Publication title -
the journal of physical chemistry b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 392
eISSN - 1520-6106
pISSN - 1520-5207
DOI - 10.1021/jp067680y
Subject(s) - orthorhombic crystal system , electrical resistivity and conductivity , materials science , ion , crystallography , coupling (piping) , substitution (logic) , bond length , magnetic moment , condensed matter physics , crystal structure , chemistry , metallurgy , physics , organic chemistry , quantum mechanics , computer science , programming language
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 (mueff) 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.
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