Abstract
A monophosphate molybdenum bronze Ag2.8(PO2)4(MoO3)12has been synthesized for the first time. This monoclinic bronze (a=23.857(3) Å,b=5.2990(6) Å,c=6.5659(4) Å,β=93.950(6)°), represents them=6 member of the Ax(PO2)4(MO3)2mfamily (M=W, Mo). Its structure, which consists of ReO3-type slabs interconnected with monophosphate groups, is very similar to those of them=6 members Kx(PO2)4(WO3)12and Mo4O11, forming hexagonal tunnels where the Ag+cations are located. The distribtion of Ag+in the tunnels is however different from that of K+in the phosphate tungsten bronze: two sites are partially occupied close to the walls of the tunnels so that Ag+exhibits a ninefold and a tetrahedral coordination. The resistivity measurements, although performed on polyphasic samples, clearly show a semiconducting behavior. The possibility of charge density wave properties is considered.
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