Total Scattering and Pair Distribution Function Analysis in Modelling Disorder in PZN

Whitfield, Ross E.; Goossens, Darren J; Welberry, T. R.

doi:10.1107/S2052252515018722

Title: Total Scattering and Pair Distribution Function Analysis in Modelling Disorder in PZN

Journal Article · Fri Jan 01 00:00:00 EST 2016 · IUCrJ

DOI:https://doi.org/10.1107/S2052252515018722· OSTI ID:1234313

Whitfield, Ross E. ^[1]; Goossens, Darren J ^[2]; Welberry, T. R. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Australian National Univ., Canberra, ACT (Australia)

The ability of the pair distribution function (PDF) analysis of total scattering (TS) from a powder to determine the local ordering in ferroelectric PZN (PbZn_1/3Nb_2/3O₃) has been explored by comparison with a model established using single-crystal diffuse scattering (SCDS). While X-ray PDF analysis is discussed, the focus is on neutron diffraction results because of the greater extent of the data and the sensitivity of the neutron to oxygen atoms, the behaviour of which is important in PZN. The PDF was shown to be sensitive to many effects not apparent in the average crystal structure, including variations in the B-site—O separation distances and the fact that (110) Pb²⁺ displacements are most likely. A qualitative comparison between SCDS and the PDF shows that some features apparent in SCDS were not apparent in the PDF. These tended to pertain to short-range correlations in the structure, rather than to interatomic separations. For example, in SCDS the short-range alternation of the B-site cations was quite apparent in diffuse scattering at (½ ½ ½), whereas it was not apparent in the PDF.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1234313

Journal Information:: IUCrJ, Vol. 3, Issue 1; ISSN 2052-2525

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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