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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) Å 3 , Z = 8, D calc  = 2.68×10 3  kg/m 3 . With the aid of high temperature X-ray diffractometry a strongly anisotropic thermal expansion has been observed: α a = 61·10 -6  K -1 ,  α b = 23·10 -6  K -1  and α c = 4.7·10 -6  K -1 . This anisotropy may be caused by anisotropic thermal vibrations of heavy atoms as rubidium.

Crystal structure and thermal expansion of β-RbB 5 O 8 from powder diffraction data