Manganese Vanadate Chemistry in Hydrothermal BaF2 Brines: Ba3Mn2(V2O7)2F2 and Ba7Mn8O2(VO4)2F23.
Manganese Vanadate Chemistry in Hydrothermal BaF2 Brines: Ba3Mn2(V2O7)2F2 and Ba7Mn8O2(VO4)2F23.
复制标题
热液 BaF2 盐水中的钒酸锰化学：Ba3Mn2(V2O7)2F2 和 Ba7Mn8O2(VO4)2F23。
作者：
L. Sanjeewa;C. McMillen;M. McGuire;J. Kolis
以BaF2为矿化剂，采用高温水热法合成了钒酸锰氟化物。Ba3Mn2(V2O7)2F2在C2/c空间群中结晶，由边缘共享的MnO4F2三角形棱镜与V2O7基团连接而成。Ba7Mn8O2(VO4)2F23在Cmmm空间群中结晶，由边角共享的Mn2+/3+(O，F)6八面体构建氟化氧化锰网络。这些八面体形成交替的Mn2+和Mn2+/3+层，由VO4四面体隔开。后一种化合物在TN = 25k以下呈倾斜反铁磁序。
Manganese vanadate fluorides were synthesized using high-temperature hydrothermal techniques with BaF2 as a mineralizer. Ba3Mn2(V2O7)2F2 crystallizes in space group C2/c and consists of dimers built from edge-sharing MnO4F2 trigonal prisms with linking V2O7 groups. Ba7Mn8O2(VO4)2F23 crystallizes in space group Cmmm, with a manganese oxyfluoride network built from edge- and corner-sharing Mn2+/3+(O,F)6 octahedra. These octahedra form alternating Mn2+ and Mn2+/3+ layers separated by VO4 tetrahedra. This latter compound exhibits a canted antiferromagnetic order below TN = 25 K.