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Professor John Evans' Outputs (4)

Averaging the intensity of many-layered structures for accurate stacking-fault analysis using Rietveld refinement (2016)
Journal Article
Coelho, A., Evans, J., & Lewis, J. (2016). Averaging the intensity of many-layered structures for accurate stacking-fault analysis using Rietveld refinement. Journal of Applied Crystallography, 49(5), 1740-1749. https://doi.org/10.1107/s1600576716013066

Many technologically important synthetic and natural materials display stacking faults which lead to complex peak broadenings, asymmetries and shifts in their powder diffraction patterns. The patterns can be described using an enlarged unit cell (cal... Read More about Averaging the intensity of many-layered structures for accurate stacking-fault analysis using Rietveld refinement.

Microstructures of negative and positive azeotropes (2016)
Journal Article
Shephard, J., Callear, S., Imberti, S., Evans, J., & Salzmann, C. (2016). Microstructures of negative and positive azeotropes. Physical Chemistry Chemical Physics, 18(28), 19227-19235. https://doi.org/10.1039/c6cp02450e

Azeotropes famously impose fundamental restrictions on distillation processes, yet their special thermodynamic properties make them highly desirable for a diverse range of industrial and technological applications. Using neutron diffraction, we inves... Read More about Microstructures of negative and positive azeotropes.

An Exhaustive Symmetry Approach to Structure Determination: Phase Transitions in Bi2Sn2O7 (2016)
Journal Article
Lewis, J. W., Payne, J. L., Evans, I. R., Stokes, H. T., Campbell, B. J., & Evans, J. S. (2016). An Exhaustive Symmetry Approach to Structure Determination: Phase Transitions in Bi2Sn2O7. Journal of the American Chemical Society, 138(25), 8031-8042. https://doi.org/10.1021/jacs.6b04947

The exploitable properties of many materials are intimately linked to symmetry-lowering structural phase transitions. We present an automated and exhaustive symmetry-mode method for systematically exploring and solving such structures which will be w... Read More about An Exhaustive Symmetry Approach to Structure Determination: Phase Transitions in Bi2Sn2O7.

3D Transition Metal Ordering and Rietveld Stacking Fault Quantification in the New Oxychalcogenides La2O2Cu2–4xCd2xSe2 (2016)
Journal Article
Ainsworth, C., Lewis, J., Wang, C., Coelho, A., Johnson, H., Brand, H., & Evans, J. (2016). 3D Transition Metal Ordering and Rietveld Stacking Fault Quantification in the New Oxychalcogenides La2O2Cu2–4xCd2xSe2. Chemistry of Materials, 28(9), 3184-3195. https://doi.org/10.1021/acs.chemmater.6b00924

A number of LnOCuCh (Ln = La–Nd, Bi; Ch = S, Se, Te) compounds have been reported in the literature built from alternating layers of fluorite-like [Ln2O2]2+ sheets and antifluorite-like [M2Se2]2– sheets, where M is in the +1 oxidation state leading t... Read More about 3D Transition Metal Ordering and Rietveld Stacking Fault Quantification in the New Oxychalcogenides La2O2Cu2–4xCd2xSe2.