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The structures of crystalline hydrogen bromide
Published/Copyright:
August 25, 2010
Summary
Solid HBr exhibits a series of phase transitions from cubic Ia via Ib, to orthorhombic II and III. The structure of Ib has been solved and refined with neutron diffraction data. It crystallizes in space group Pa[unk]. The molecules show dynamical disorder, the hydrogen atom preferentially reorienting in planies formed by 6 out of 12 nearest neighbour bromine atoms. The phase Ib does not occur with DBr but can still be observed with a 90% DBr/HBr sample due to the delayed formation of phase II with decreasing temperature. – The group-subgroup relations for the different HBr modifications are established.
Published Online: 2010-08-25
Published in Print: 1988
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