Towards a unified description of the AMOB2O5 (A=K, Rb, Cs, Tl; M=Nb, Ta) family of compounds.

@article{Schmid2000TowardsAU,
  title={Towards a unified description of the AMOB2O5 (A=K, Rb, Cs, Tl; M=Nb, Ta) family of compounds.},
  author={Siegbert Schmid and Ray L. Withers and D Corker and P Baules},
  journal={Acta crystallographica. Section B, Structural science},
  year={2000},
  volume={56 Pt 4},
  pages={558-64}
}
Single-crystal X-ray diffraction data (Mo Kalpha radiation) are used to re-refine the structure of RbNbOB2O5, rubidium niobium oxo pyroborate. The structure is refined as an incommensurate modulated structure with superspace group symmetry Pmn2(1)(0,0.4,0)s and lattice parameters a = 7.406 (2), b = 3.939 (2) and c = 9.475 (2) A. Refinement on 3242 unique reflections converged to R = 0.031, while a previous conventional superstructure refinement led to R = 0.090. This lowering of the R factor… CONTINUE READING

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