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Figure 4
Projections of the average crystal structure of Sr3B2.78Si0.22O7.61 onto the ab (a), ac (b) planes in comparison to the pole figure of thermal expansion coefficients and part of the borosilicate pseudo-chain (c). The pole figures for 400 and 1300 K are shown in solid and dashed lines, respectively. Displacements of Sr and O1 atoms relative to the average positions are shown in an encircled fragment of the ac projection. The arrows indicate the directions of displacive modulations; the arrow lengths are equal to the amplitude of displacement. Italic numbers near the atom labels are the site occupancies. Ellipsoids of Sr atoms are drawn at 94% probability level.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 71| Part 5| September 2015| Pages 489-497
doi:10.1107/S2052520615011713
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