X-Ray crystal structure determinations of two sodium aluminates have shown Na5AlO4(orthorhombic, space group pbca) to contain discrete AlO4 tetrahedra and Na7Al3O8(triclinic, P) to contain a novel ring structure made up of six AlO4 tetrahedra which are linked by four oxygen bridges to form an infinite chain.
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Journal of the Chemical Society, Chemical Communications
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