Crystal structures of tetrastrontium dibismuthide oxide, Sr4Bi2O, and tetrabarium dibismuthide oxide, Ba4Bi2O

Bi2OSr4, tetragonal, I4/mmm (no. 139), a = 4.9948(7) Å, c = 17.548(4) Å, V = 437.8 Å, Z = 2, Rgt(F) = 0.075, wRref(F ) = 0.196, T = 298 K. Ba4Bi2O, tetragonal, I4/mmm (no. 139), a = 5.2662(7) Å, c = 18.625(4) Å, V = 516.5 Å, Z = 2, Rgt(F) = 0.043, wRref(F ) = 0.109, T = 298 K.

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