Abstract
Treatment of γ-titanium phosphate with 1 mol dm–3 solutions of MCl (M = Na, K, Cs) results in layered crystalline phases with compositions at 50 °C of: γ-Ti(Na0.5H1.5PO4)(PO4)·H2O, γ-Ti(KHPO4)(PO4)·½H2O and γ-Ti(Cs0.5H1.5PO4)(PO4)·½H2O. Heating at 900 °C gives rise to three-dimensional crystalline compounds. The composition of the new materials depends on the type of alkali-metal present in the solid. The K phase originates KTi2(PO4)3, the Cs phase α-CsTi3P5O19, and the Na phase produces mixtures of NaTi2(PO4)3 and TiP2O7. Moreover, amorphous alkali-metal phosphates which are soluble in acidic media are formed. Samples of γ-Ti(KHPO4)(PO4)·½H2O (A), KTi2(PO4)3(B) and α-CsTi3P5O19(C) have been studied using X-ray powder diffraction. The lattice parameters of A [a= 5.063(3)Å, b= 6.297(1)Å, c= 11.502(5)Å, β= 109.30(4)°], B [a= 8.3569(2)Å, c= 23.0725(3)Å] and C [a= 6.320(1)Å, b= 14.122(2)Å, c= 9.333(2)Å, β= 105.82(2)°] have also been calculated.
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