title: The effect of Mg doping on the structural and physical properties of LuFe(2)O(4) and Lu(2)Fe(3)O(7).
abstract: The structural and physical properties of the recently discovered electronic ferroelectric materials LuFe(2)O(4) and Lu(2)Fe(3)O(7) have been investigated for Mg substitution of Fe. X-ray diffraction data demonstrate that the lattice parameters in both systems change progressively with increasing Mg content, with a smaller unit cell volume on replacing Fe(2+) by Mg(2+). X-ray absorption near-edge spectroscopy experiments at the Fe K-edge show that the average Fe oxidation state is slightly increased along with Mg doping in Lu(2)Fe(3)O(7) materials, consistent with isomorphous replacement of Fe(2+) by Mg(2+). Measurements of dielectric properties demonstrate that Mg doping could have an effect on the electron hopping energy between Fe(2+) and Fe(3+) ions. Transmission electron microscopy and magnetization analysis reveal that Mg doping in LuFe(2)O(4) has a much greater influence than in Lu(2)Fe(3)O(7) on both the charge ordering and the low-temperature magnetic properties.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Y B
authors.initials: YB
authors.lastname: Qin
authors.forename: H X
authors.initials: HX
authors.lastname: Yang
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: H F
authors.initials: HF
authors.lastname: Tian
authors.forename: C
authors.initials: C
authors.lastname: Ma
authors.forename: Y G
authors.initials: YG
authors.lastname: Zhao
authors.forename: R I
authors.initials: RI
authors.lastname: Walton
authors.forename: J Q
authors.initials: JQ
authors.lastname: Li