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Figure 1
(a) The ideal ordered crystal structure of PST projected along [001]. (b) Dark-field TEM image recorded from PST along the [110] direction, showing a complex arrangement of structurally ordered domains. The domains close to the grain boundary are larger compared with those away from the boundaries. (c), (d) Proposed crystal structure models of PST, showing the manner in which the O octahedra might tilt, distorting the Pb, Sc and Ta ions. Note the different arrangements of octahedral sites depending on the choice of the origin. Neutron diffraction studies presented here show that there is no octahedral tilting in PST.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 35| Part 2| March 2002| Pages 233-242
doi:10.1107/S0021889802001280
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