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Crystal structure and vibrational properties of KMg4(PO4)3

Authors
Journal
Solid State Sciences
1293-2558
Publisher
Elsevier
Publication Date
Volume
7
Issue
10
Identifiers
DOI: 10.1016/j.solidstatesciences.2005.06.002
Keywords
  • Phonon Properties
  • Crystal Structure
  • X-Ray Diffraction
  • Ir
  • Raman

Abstract

Abstract Single crystals of potassium magnesium phosphate KMg 4(PO 4) 3 have been obtained from flux and characterized by means of single-crystal X-ray diffraction method and IR and Raman spectroscopy. This compound crystallizes in the Pnnm space group with a = 16.361 ( 3 ) , b = 9.562 ( 19 ) , c = 6.171 ( 12 ) Å and Z = 4 . The structure is built up of PO 4 tetrahedra, MgO 6 octahedra and MgO 5 polyhedra connected via P O Mg bridges to form a three-dimensional framework enclosing tunnels along b-axis occupied by K + ions. IR and Raman spectra are consistent with the crystal structure. The internal and external modes are observed in the 350–1210 cm −1 range and below 330 cm −1, respectively.

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