Relationship between polytetrahedral crystals and glasses by using anomalous X-ray diffraction technique and geometrical modelling

Abstract

Partial interference functions and radial distribution functions are determined using the anomalous X-ray diffraction technique for the amorphous alloy Cu 2Y. These results are generalized for the amorphous family of A 2B amorphous alloys where A is Co, Fe, Cu, or Ni and B is Zr or Y. By comparing the coordination number and interatomic distances obtained experimentally with those of geometrical models, the icosahedral order and the occurrence of disclination networks in these Frank and Kasper crystalline and glassy phases are analysed.