Verbindungen des Typs MII3MIII(PO4)3 mit Eulytinstruktur (MII = Pb,Sr, Ba; MIII = La,Lanthanide, Y,Sc, Bi,In, TI)1 |
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Authors: | G Engel |
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Abstract: | A number of new phosphates of the formula MII3MIII(PO4)3 has been prepared. They have the cubic structure of eulytite (Bi4(SiO4)3). Obviously all combinations of the cations being specified in the title for MII and MIII seem to be possible; moreover, Ca3Bi(PO4)3 does exist. The ions MII and MIII are distributed on the positions of Bi in a statistical manner. The peculiar dependence of the lattive constants of the lanthanide compounds Pb3Ln(PO4)3 (including La) on the (Atomic number of the lanthanide ions suggests the conclusion that the small trivalent cations (r < 1 Å) do not have a close contact with the surrounding oxygen ions forming a distorted octahedron. |
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