MEM-based structure-refinement system REMEDY and its applications

F. Izumi, S. Kumazawa, T. Ikeda, W. Z. Hu, A. Yamamoto, K. Oikawa

Research output: Contribution to journalConference articlepeer-review

79 Citations (Scopus)


A Rietveld-analysis program RIETAN was combined with MEED for a maximum-entropy method (MEM) to grow into an integrated software REMEDY. At first, 'observed' structure factors, Fo, estimated after Rietveld analysis are analyzed by the MEM to give electron/nuclear densities biased by a structural model. Then, we evaluate structure factors, Fc(MEM), by the Fourier transform of the densities and fit the whole powder pattern calculated from the Fc(MEM) data to the observed one to refine parameters irrelevant to the structure. Fo data obtained in such a manner are analyzed again by the MEM. MEM analysis and whole-pattern fitting are alternately repeated until R factors in the pattern fitting no longer decrease. REMEDY was utilized to investigate (a) positional disorder of K+ ions interlayered in KxTi2-x/3Lix/3O4, (b) atomic arrangement of K clusters in K-type LTA, and (c) nuclear/electron-density distribution in HgBa2CuO4+δ.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalMaterials Science Forum
Issue numberI
Publication statusPublished - 2001 Jan 1
Externally publishedYes
Event7th European Powder Diffraction Conference - Barcelona, Spain
Duration: 2000 May 202000 May 23


  • Electron density
  • Layered compound
  • Maximum-entropy method
  • Nuclear density
  • Superconductor
  • Whole-pattern fitting
  • Zeolite

ASJC Scopus subject areas

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


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