Add time:08/13/2019         Source:sciencedirect.com

A ZINC CHROMATE (cas 13530-65-9) with the formula (NH4OH)3/2(ZnCrO4)2 was synthesized by hydrothermal reaction at 100°C in 24 h. The structure was solved from powder data and refined with GSAS. The yellow solid crystallizes in the hexagonal space group R−3m with a=5.99634(7) Å and c=21.5117(3) Å. Two types of adjacent rows of zinc octahedra, one of which is full while its neighbor has a vacant site between successive octahedra, are linked through chromate groups which extend two vertices to consecutive edge sharing octahedra in one row and a third vertex which serves as bridge to the contiguous row. The fourth tetrahedral vertex protrudes into the interlayer space. This arrangement repeats itself indefinitely in the ab plane to create a layered structure.

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