| Popis: |
The coincidence of a meeting at CECM/CNRS in 1985 to plan work on the newly discovered quasicrystals with a meeting at IHES on hyperspace crystallography greatly expanded crystallography and made France a major player in the opportunities provided by this discovery. Adherence to a paradigm which forbade possible symmetries for sharply diffracting solids discouraged US crystallographers from the field. Even though there were many earlier warnings and amendments to this false paradigm, it was considered by many to be a defining law of crystallography. By 1992, the International Union of Crystallography changed the definition of crystals to include quasicrystals. This definition still excludes many ordered structures, like a recently studied isotropic metallic structure that is as strongly ordered as a related intermetallic crystal. |
