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CMP
Credit: Jack Hobhouse

David Keen

Visiting Professor

Sub department

  • Condensed Matter Physics

Research groups

  • X-ray and neutron scattering
david.keen@physics.ox.ac.uk
Telephone: 01865 (2)72310
Clarendon Laboratory, room 106
  • About
  • Publications

Crystal clear

EBR - European Biopharmaceutical Review (2015) 65-67

Crystallography and physics

Physica Scripta IOP Publishing 89:12 (2014) 128003
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Observation of Interstitial Molecular Hydrogen in Clathrate Hydrates

Angewandte Chemie International Edition Wiley 53:40 (2014) 10710-10713

Authors:

R Gary Grim, Brian C Barnes, Patrick G Lafond, Winfred A Kockelmann, David A Keen, Alan K Soper, Masaki Hiratsuka, Kenji Yasuoka, Carolyn A Koh, Amadeu K Sum
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L-Arabinose Binding, Isomerization, and Epimerization by D-Xylose Isomerase: X-Ray/Neutron Crystallographic and Molecular Simulation Study

Structure Elsevier 22:9 (2014) 1287-1300

Authors:

Paul Langan, Amandeep K Sangha, Troy Wymore, Jerry M Parks, Zamin Koo Yang, B Leif Hanson, Zoe Fisher, Sax A Mason, Matthew P Blakeley, V Trevor Forsyth, Jenny P Glusker, Horace L Carrell, Jeremy C Smith, David A Keen, David E Graham, Andrey Kovalevsky
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The missing boundary in the phase diagram of PbZr1-xTixO3

Nature Communications Nature Publishing Group 5 (2014) 5231

Authors:

N Zhang, H Yokota, Anthony Glazer, Z Ren, DA Keen, DS Keeble, PA Thomas, ZG Ye

Abstract:

PbZr(1-x)Ti(x)O3 (PZT) is one of the most important and widely used piezoelectric materials. The study of its local and average structures is of fundamental importance in understanding the origin of its high-performance piezoelectricity. Pair distribution function analysis and Rietveld refinement have been carried out to study both the short- and long-range order in the Zr-rich rhombohedral region of the PZT phase diagram. The nature of the monoclinic phase across the Zr-rich and morphotropic phase boundary area of PZT is clarified. Evidence is found that long-range average rhombohedral and both long- and short-range monoclinic regions coexist at all compositions. In addition, a boundary between a monoclinic (M(A)) structure and another monoclinic (M(B)) structure has been found. The general advantage of a particular monoclinic distortion (M(A)) for high piezoactivity is discussed from a spatial structural model of susceptibility to stress and electric field, which is applicable across the wide field of perovskite materials science.
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