Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 181, Issue 11, Pages 3110-3115Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2008.07.039
Keywords
Solid-state synthesis; Single-crystal XRD; Intersecting tunnels structure; Mixed framework; Lithium manganese diphosphate
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A new member of the A(2)MP(2)O(7) diphosphate family, Li2MnP2O7, has been synthesized by solid-state reaction and characterized using single-crystal X-ray diffraction. Li2MnP2O7 crystallizes in the monoclinic space group P2(1)/a (#14) with the cell parameters a = 9.9158(6) angstrom, b = 9.8289(6) angstrom, C = 11.1800(7) angstrom, beta = 102.466(5)degrees, Z = 8 and V = 1063.9(1) angstrom(3). Its mixed framework exhibits an original Mn2O9 unit, built up of one MnO5 trigonal bipyramid sharing one edge with one MnO6 octahedron. These Mn2O9 units are sharing corners with P2O7 diphosphate groups, forming the undulating [Mn4P8O32](infinity) layers. The [MnP2O7]infinity 3D framework, resulting from the interconnection of the undulating [Mn4P8O32](infinity) layers, exhibits different kinds of intersecting tunnels containing the Li cations. (C) 2008 Elsevier Inc. All rights reserved.
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