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2005
Structure
D 2000
12- 006
The Crystal Structure of High-Temperature α-CsB5O8 Modification at 20, 300,
and 500 °C. — As revealed by single crystal XRD the colorless title compound crystallizes in the monoclinic space group P21/c with Z = 4 at 20, 300, and 500 °C. The
structure is based on the zigzag B-O layers built up from rigid pentaborate groups. Cs
atoms are located in large cavities of the layer and have nine neighboring O atoms.
High-temperature powder XRD indicates a strongly anisotropic character of the thermal expansion. The CsO9 polyhedron plays the dominating role in bulk thermal expansion of the structure, whereas the high anisotropy is caused by partial straightening of
the zigzag layer through hinge mechanism. — (FILATOV*, S.; BUBNOVA, R.;
SHEPELEV, Y.; ANDERSON, J.; SMOLIN, Y.; Cryst. Res. Technol. 40 (2005) 1-2,
65-72; Dep. Crystallogr., St. Petersburg State Univ., St. Petersburg 199034, Russia;
Eng.) — W. Pewestorf
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