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Superstructure ordering in lanthanum-doped lead magnesium niobate (2000)

Fanning, D. M. ; Robinson, I. K.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 840-848

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Superstructure reflections of lead magnesium niobate (PMN), Pb(Mg1/3Nb2/3)O3, were measured with synchrotron radiation x-ray diffraction. Our data conclusively demonstrate that the (h+〈fraction SHAPE="CASE"〉12,k+〈fraction SHAPE="CASE"〉12,l+〈fraction SHAPE="CASE"〉12)-type reflections are the result of chemical ordering between the Mg and Nb ions in domains of 50 Å. Structure factor analysis of these peaks reveals an oxygen displacement within the ordered regions of 0.044(3) Å along a 〈100〉 direction towards the Nb ion. Single crystals of La-doped PMN (La–PMN) exhibit much larger chemically ordered regions (up to 900 Å for 10% La–PMN). Structural analysis of the La–PMN suggests that as the ordered region increases in size, the ordering changes from complete Nb:Mg ordering and approaches Nb:(Mg2/3Nb1/3) ordering. Although anticipated from electrostatic energy arguments, our conclusions are based on a clear trend in the bond length of the mixed site as a function of La doping. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.371951

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DAFS analysis of magnetite (1999)

Frenkel, A. I. ; Cross, J. O. ; Fanning, D. M. ; [et al.]

Chester : International Union of Crystallography (IUCr)

Journal of synchrotron radiation 6 (1999), S. 332-334

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ISSN: 1600-5775

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Geosciences , Physics