Tetrayttrium(III) trisulfide disilicate, Y4S3(Si2O7), crystallizes in the Sm4S3(Si2O7) structure type. The structure consists of isolated (Si2O7)6− units (2mm. symmetry) and two crystallographically independent Y3+ cations bridged by one S and one O atom. The first Y atom (site symmetry .m.) is coordinated by three O atoms and three S atoms in a trigonal–prismatic arrangement whereas the second Y atom (site symmetry ..2) is coordinated by six O atoms and three S atoms in a tricapped trigonal–prismatic arrangement
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