Crystal structure and ion conductivity of a new mixed-anion phosphate LiMg3(PO4)P2O7

Title
Crystal structure and ion conductivity of a new mixed-anion phosphate LiMg3(PO4)P2O7
Author(s)
김영일김성철[김성철]이미선[이미선]강진영[강진영]김승주[김승주]
Keywords
TITANIUM PHOSPHATES; MAGNETIC-PROPERTIES; MOLECULAR-SIEVES; LITHIUM; LI7LA3ZR2O12; CHEMISTRY; CATALYSTS; EXCHANGE; MOBILITY; NASICON
Issue Date
201505
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF SOLID STATE CHEMISTRY, v.225, pp.335 - 339
Abstract
A new lithium-containing phosphate, LiMg3(PO4)P2O7, was prepared by a solid-state reaction, and it was characterized by an ab initio structure determination method on the basis of synchrotron powder X-ray diffraction data. LiMg3(PO4)P2O7 was found to be orthorhombic (space group Pnma) with lattice parameters a=9.0387(1) angstrom, b=10.6072(1) angstrom, c= 8.3065(1) angstrom, and V=796.39(1) angstrom(3). The structure features infinite [Mg3O10](infinity) layers that are parallel to the bc plane and that are interconnected along the a axis by PO4 and P2O7 groups. The [Mg3O10](infinity) layer contains Mg3O14 trimers that are formed by three edge-shared MgO6 octahedra. The PO4 and P2O7 groups are located alternatively between [Mg3O10](infinity) layers. This gives rise to a three-dimensional framework that contains large tunnels along the directions [1 0 0] and [0 1 0]; the Li+ ions are stabilized in these tunnels. AC impedance spectroscopy shows that LiMg3(PO4)P2O7 has an ionic conductivity of 3.40 x 10(-5) S cm(-1) at 769 K, with an activation energy of 1.17 eV. (C) 2015 Elsevier Inc. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/32532http://dx.doi.org/10.1016/j.jssc.2015.01.011
ISSN
0022-4596
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이과대학 > 화학생화학부 > Articles
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