Preparation and ionic conductivity of Al-Doped Mg 0.5Ti 2(PO 4) 3

Hiroo Takahashi, Hitoshi Takamura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Al-doped Mg0.5(1+x)AlxTi2 -x(PO4) 3 has been prepared by a solgel method and the conductivity has been evaluated by an ac impedance method to determine the optimum lattice volume for Mg-ion conduction. Instead of using Ti in the samples, 1015 mol%Al was used, resulting in lattice contraction in the c-axis direction. The samples, sintered at 500800° C for 12 h by a reaction sintering method, had a relative density of 7080% and their grain size was 23 μm. The ionic conductivity calculated from the grain and grain boundary resistance at 600°C was 7.1 × 10 -5 and 1.3 × 10 -5 S/cm, respectively. The activation energy of the grain conductivity was 128 kJ/mol in the temperature range of 300 to 600°C. By comparing ionic conductivity of various-doped titanium phosphates, optimum lattice volume was estimated to be 1.304nm 3.

Original languageEnglish
Pages (from-to)932-935
Number of pages4
JournalMaterials Transactions
Issue number5
Publication statusPublished - 2012


  • Ionic conductor
  • NASICON-type structure
  • Phosphate

ASJC Scopus subject areas

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


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