Third structure determination by powder diffractometry round robin (SDPDRR-3)

A. Le Bail*, L. M.D. Cranswick, K. Adil, A. Altomare, M. Avdeev, R. Cerny, C. Cuocci, C. Giacovazzo, I. Halasz, S. H. Lapidus, J. N. Louwen, A. Moliterni, L. Palatinus, R. Rizzi, E. C. Schilder, P. W. Stephens, K. H. Stone, J. Van Mechelen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


The results from a third structure determination by powder diffractometry (SDPD) round robin are discussed. From the 175 potential participants having downloaded the powder data, nine sent a total of 12 solutions (8 and 4 for samples 1 and 2, respectively, a tetrahydrated calcium tartrate and a lanthanum tungstate). Participants used seven different computer programs for structure solution (ESPOIR, EXPO, FOX, PSSP, SHELXS, SUPERFLIP, and TOPAS), applying Patterson, direct methods, direct space methods, and charge flipping approach. It is concluded that solving a structure from powder data remains a challenge, at least one order of magnitude more difficult than solving a problem with similar complexity from single-crystal data. Nevertheless, a few more steps in the direction of increasing the SDPD rate of success were accomplished since the two previous round robins: this time, not only the computer program developers were successful but also some users. No result was obtained from crystal structure prediction experts.

Original languageEnglish (US)
Pages (from-to)254-262
Number of pages9
JournalPowder Diffraction
Issue number3
StatePublished - 2009
Externally publishedYes


  • Blind test
  • Crystal structure determination
  • Powder diffraction
  • Round robin

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Instrumentation
  • Condensed Matter Physics


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