ICDD Technical Committee Minutes

Electron Diffraction Subcommittee
March 25, 2004
ICDD Headquarters
Chairman - Alwyn Eades

Minutes of the meeting of the Electron Diffraction Subcommittee held at Newtown Square on March 25, 2004.

Summary of the most important points:

The PDF is well on the way to meeting our needs.
The idea of an XRF and EDS database is attractive to this group.

  1. The 11 people attending the meeting were welcomed. This is the same number as attended last year.
  2. The minutes of the meeting on March 20, 2003 were approved.
  3. Ray Goehner, the Board Liaison, made a report. The main information given was that a deal has been struck with the "Pauling File" so that, in the 2005 Release of the PDF, about 100,000 records will have atomic coordinates included. There will also be a substantial increase in the number of records. The inclusion of atomic coordinates is very good news for the electron diffraction community.
  4. There was a brief discussion of the matter of variable composition structures (which had been discussed last year). It was felt that the improved polytyping that will be available in the database in the 2005 Release, may make this matter mute. In any case, if we can provide a list of the phases in which there is an interest, it would not be difficult to handle the issue.
  5. It is now possible to do more with the PDF through the development of plug-ins. The subcommittee was asked to let headquarters know of any plug-ins it would find useful.
  6. John Friel reported on the work that is being done within ASTM to develop a standard for the measurement of grain size using EBSD.
  7. We have learned that the FBI is issuing a request for proposals to develop a database for XRF and EDS data to help in the forensic analysis of samples. This could be of potential importance to the electron diffraction community and the idea that ICDD would host such a database was thought to be very attractive. Considerable time was spent in a discussion with Tim Fawcett on how this might be done.

Alwyn Eades