Two forms of sodium titanium(III) diphosphate: α-NaTiP2O7 closely related to β-cristobalite and β-NaTiP2O7 isotypic with NaFeP2O7
1988; Elsevier BV; Volume: 77; Issue: 2 Linguagem: Inglês
10.1016/0022-4596(88)90252-6
ISSN1095-726X
AutoresA. Leclaire, A. Benmoussa, M.M. Borel, A. Grandin, B. Raveau,
Tópico(s)Polyoxometalates: Synthesis and Applications
ResumoThe structures of two new forms of a titanium(III) phosphate NaTiP2O7 have been determined. One of them, β-NaTiP2O7 [a = 7.394(1)Å, b = 7.936(3)Å, c = 9.726(3)Å β = 11.85(2)° P21c], is isotypic with NaFeP2O7 which has been previously described. The other form, α-NaTiP2O7 [a = 8.697(1)Å, b = 5.239(7)Å, c = 13.293(3)Å, β = 116.54(1)°, P21c], is found to be closely related to the structure of β-cristobalite and of carnegieite and is described as a "pseudo-hexagonal" framework characterized by intersecting tunnels.
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