Publication Details (including relevant citation information):
Isomorphous Substitution in KTiOPO4: A Single Crystal Diffraction Study of Members of the K1-xNaxTiOPO4 Solid Solution, S.J. Crennell, R.E. Morris, A.K. Cheetham and R.H. Jarman, Chem. Mater., 4, 82 (1992).
K0.42Na0.58TiOP04 was prepared by sodium ion exchange into KTiOPO4 at 350 C . Crystal data:
orthorhombic, Pn21a (33), a = 12.7298 (21), b = 10.6073 (13), c = 6.3074 (4) A, V = 861.7 A3, Z = 4, Dc=
2.942 g/cm3, F(000) = 736. A sample was subsequently annealed at 700 C . The structure of the ion-exchanged
material is very similar to that found after annealing and is also consistent with that obtained
in an earlier powder diffraction and solid-state NMR study of K0.5Na0.5TiOPO4, confirming the validity
of the powder work. There is considerable ordering over the two sites (site 1 0.933 (1) Na:0.067 (1) K;
site 2 0.773 (7) K:0.227 (7) Na), and the single-crystal diffraction data are of sufficient resolution to detect
the differing positions for the two cations on each site. Cation substitution does not affect the surrounding
oxygen coordination sphere.
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