Die Synthese und Kristallstruktur von Ba2Mn(B3O6)2 und Ba2Co(B3O6)2 / Synthesis and Crystal Structure of Ba2Mn(B3O6)2 and Ba2Co(B3O6)2
Abstract
Single crystals of Ba 2 Mn(B 3 O 6 ) 2 (I) and Ba 2 Co(B 3 O6) 2 (II) were prepared by using a B 2 O 3 flux technique, Ba 2 Mn(B 3 O 6 ) 2 in an argon atmosphere. X-ray investigations on single crystals of both compounds yield the space group C 3i 2 R3̄ (No. 148) with 3 formula units in the cell of dimensions (I) a = 711.01(4), c = 1694.90(3) pm and (II) a = 707.2(2), c = 1673.8(1) pm. The crystal structure is built by nearly planar (B 3 O 6 ) 3- rings and contains one ninefold coordinated Barium site. Mn(I) and Co(II) are octahedrally coordinated by oxygen. The compounds are isotypic to B 2 Ca(B 3 O 6 ) 2 .
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