| Abstrakt: |
Two new alkali tellurates Cs2SO4·Te(OH)6(CsSTe) and Cs2SeO4·Te(OH)6(CsSeTe), are obtained by action of telluric acid H6TeO6with respectively, caesium sulfate Cs2SO4and caesium carbonate Cs2CO3and selenic acid H2SeO4. CsSTe is rhombohedric, R3, with a=b=7.4790(3) Å, c=16.6370(6) Å, Z=3, V=805.92(5) Å3and ρmeas=3.656 g/cm3. Its atomic arrangement is described by some planes of pure octahedra TeO6altering with planes of pure tetrahedra SO4perpendicular to some directions. CsSeTe is monoclinic, P21/c, with a=12.817(6) Å, b=7.519(3) Å, c=12.432(5) Å, β=111.16(2)°, V=1117.3(8) Å3, Z=4 and ρmeas=3.795 g/cm3. Its structure exhibits infinite TeO66−and SeO42−planes where the alkali cations are intercalated. In both structures a network of strong hydrogen bonds connects the different components in the building of the crystal. |
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