Zur Synthese und Kristallstruktur von Dibariumkaliumtrizinkborat Ba₂KZn₃(B₃O₆)(B₆O₁₃)/Synthesis and Crystal Structure of Di-barium Potassium Tri-zinc Borate Ba₂KZn₃(B₃O₆)(B₆O₁₃)

Abstract

Abstract Single crystals of the new compound Ba 2 KZn 3 (B 3 O 6 )(B 6 O 13 ) were obtained by using a B 2 O 3 flux technique; they crystallize in an as yet unknown structure type. X-ray investigations led to the space group C i 1 -P1̄ (Nr.2) with lattice parameters a = 705.2(2), b = 712.5(2), c = 1880.3(6), a = 93.43(3)°, β = 90.72(2)°, γ = 119.57(2)°, Z = 2. The structure contains (B 3 O 6 ) 3- -rings and a new discrete (B 6 O 13 ) 8- anion, which is composed of two BO 4 and two B 2 O 5 units. Zn 2+ is tetrahedrally coordinated by oxygen and two out of three tenfold coordinated Ba-sites are statistically occupied by Ba 2+ and K + .