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- W2045604829 abstract "Refinements of five crystals in the Cs 2 x Rb 2−2 x Ti 2 O 2 As 2 O 8 series, caesium rubidium titanyl arsenate, with x = 0.07, 0.31, 0.58, 0.71 and 0.86, which are compositional analogues of KTiOPO 4 (KTP), have been completed at 293 K and two ( x = 0.71, 0.86) at low temperature. All the structures are found to be orthorhombic (space group Pna 2 1 ) and are isostructural with KTP, although there is evidence of some Cs disorder over additional sites in the framework, particularly at the Cs-rich end of the series, as discussed in Part II [Thomas & Womersley (1998). Acta Cryst. B 54 , 645–651]. Unusually large U 33 parameters for shared Cs/Rb sites are observed and are shown to be the result of the existence of separate sites for Cs and Rb within the structural framework, although the coordinates of these sites cannot be resolved convincingly. The structural changes in the TiO 6 /AsO 4 framework required to accommodate an increasing fraction of the larger Cs cation across the series and under cooling to 120 K are elucidated. Finally, the deviations of the room-temperature and low-temperature structures from the high-temperature prototypic structure (space group Pnan ) are examined and suggest that the phase-transition temperature should increase linearly from CsTiOAsO 4 to RbTiOAsO 4 ." @default.
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- W2045604829 date "1998-10-01" @default.
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- W2045604829 title "Investigation of the Cs<sub> <i>x</i> </sub>Rb<sub>1−<i>x</i> </sub>TiOAsO<sub>4</sub> Series. I. Crystal Structure Analysis and Pseudo-symmetry" @default.
- W2045604829 doi "https://doi.org/10.1107/s0108768198002985" @default.
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