The crystal structures of RbTiOAsO4, KTiO(Po.58,AS0.42)O4, RbTiOPO4 and (Rbo.465,Ko.535)TiOPO4, all of which are orthorhombic (space group Pna2~) and isostructural with KTiOPO4, have been determined from single-crystal X-ray diffraction data and refined to R factors between 0.027 and 0.040. The results are used for an analysis of structural trends in crystals of the KTiOPO4 family by comparison of the room-temperature structures with that proposed for the high-temperature prototypic phase (space group Pnan).
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Thomas et al. (1992) studied this question.