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Crystal structure and thermal expansion of β-RbB5O8 from powder diffraction data
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Peter Paufler
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September 25, 2009
Using Rietveld refinement the crystal structure of the β-rubidium pentaborate has been found to be isotypic with β-potassium pentaborate: (61) Pbca - (c)14, oP112, a = 7.550(1) Å, b = 11.842(1) Å, c = 14.805(1) Å, V = 1323.7(2) Å3, Z = 8, Dcalc = 2.68×103 kg/m3. With the aid of high temperature X-ray diffractometry a strongly anisotropic thermal expansion has been observed: αa= 61·10-6 K-1, αb= 23·10-6 K-1 and αc= 4.7·10-6 K-1. This anisotropy may be caused by anisotropic thermal vibrations of heavy atoms as rubidium.
Published Online: 2009-9-25
Published in Print: 2000-12-1
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
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Articles in the same Issue
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- Edgeworth series expansion of the truncated Cauchy function and its effectiveness in the study of atomic heterogeneity
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- Molecular structures of two indole alkaloids, evodiamine and rutecarpine, from evodia fruit
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