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- W2139484483 abstract "Structure factors for rubidium oxotitanium arsenate, RbTiOAsO(4), were measured at 293 K with focused synchrotron X-radiation [lambda = 0.7500 (9) A] using a fast avalanche photodiode counter. The accurate synchrotron single-crystal data are of sufficient quality and resolution to detect the splitting positions of the Rb cations at room temperature. Strong accumulation of the Deltarho difference charge density near the Rb atoms at a distance of approximately 0.5 A in the -c direction can be attributed to the partial occupancy of additional sites related by pseudosymmetry. This type of static and/or dynamic disorder is temperature-dependent and seems to be universal for the KTiOPO(4) family of compounds. The best modelling of the experimental data was obtained with the Rb atom in split positions described within the harmonic approximation and the multipole functions for the other atoms. The Deltarho density features in the Ti-O and As-O covalent bonds can be related to the linear and non-linear susceptibility using bond-polarization theory. The charge-density maps reflect the anisotropy of non-linear susceptibility, which is larger for directions where locally antisymmetric components of Deltarho are strong." @default.
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- W2139484483 date "2000-10-01" @default.
- W2139484483 modified "2023-09-24" @default.
- W2139484483 title "Synchrotron X-ray analysis of RbTiOAsO<sub>4</sub>" @default.
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- W2139484483 doi "https://doi.org/10.1107/s0108768100006285" @default.
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