Hydrothermal synthesis, structural and physico-chemical characterizations of two Nasicon phosphates: M0.50 IITi2(PO4)3 (M = Mn, Co)

Rachid Essehli, Brahim El Bali, S. Benmokhtar, Karla Fejfarová, Michal Dusek

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Abstract

The family of titanium Nasicon-phosphates of generic formula M0.5 IITi2(PO4)3 has been revisited using hydrothermal techniques. Two phases have been synthesized: Mn0.5 IITi2(PO4)3 (MnTiP) and Co0.5 IITi2(PO4)3 (CoTiP). Single crystal diffraction studies show that they exhibit two different structural types. Mn0.5 IITi2(PO4)3 phosphate crystallizes in the R-3 space group, with the cell parameters a = 8.51300(10) Å and c = 21.0083(3) Å (V = 1318.52(3) Å3 and Z = 6). The Co0.5 IITi2(PO4)3 phosphate crystallizes in the R-3c space group, with a = 8.4608(9) Å and c = 21.174(2) Å (V = 1312.7(2) Å3 and Z = 6). These two compounds are clearly related to the parent Nasicon-type rhombohedral structure, which can be described using [Ti2(PO4)3] framework composed of two [TiO6] octahedral interlinked via three [PO4] tetrahedra. 31P magic-angle spinning nuclear magnetic resonance (MAS-NMR) data are presented as supporting data. Curie-Weiss-type behavior is observed in the magnetic susceptibility. The phases are also characterized by IR spectroscopy and UV-visible.

Original languageEnglish
Pages (from-to)1502-1510
Number of pages9
JournalMaterials Research Bulletin
Volume44
Issue number7
DOIs
Publication statusPublished - 1 Jul 2009
Externally publishedYes

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Keywords

  • D: Crystal structure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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