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K 2 Eu 4 {1B, 1[unk]}[ 6 Si 8 O 20 ]F 2 , prepared by flux-melting of Eu 2 O 3 , SiO 2 , and Si in KF under reducing conditions crystallizes with the monoclinic cell,  P 2 1 / n ,  a  = 1149.9(3) pm,  b  = 848.8(2) pm,  c  = 1162.6(4) pm,  β  = 112.10(1)[unk],  Z  = 4. The structure determination led to  R  = 7.3% ( R w   = 3.7%). The new silicate-fluoride contains strongly folded silicate sheets of connected four-membered rings, separated by interlayers of europium(II) and fluoride. The potassium ions are located in the “half-pipes” that are formed by the silicate sheet. The structure of the silicate anion is related to that of apophyllite, KCa4{uB, [unk]}[ 4 Si 4 O 10 ] 2 (F, OH) · 8 H 2 O. The isotypic compound K 2 Sr 4 {1B, [unk]}[ 6 Si 8 O 20 ]F 2  was also synthesized. It has slightly smaller lattice constants.

Synthesis, crystal growth and structure of KEu 2 [Si 4 O 10 ]F