By Ted Janssen, Gervais Chapuis, Marc de Boissieu
Until eventually the Seventies all fabrics studied consisted of periodic arrays of unit cells, or have been amorphous. within the final a long time a brand new type of reliable country topic, referred to as aperiodic crystals, has been stumbled on. it's a lengthy variety ordered constitution, yet with no lattice periodicity. it truly is present in a variety of fabrics: natural and anorganic compounds, minerals (including a considerable element of the earths crust), and steel alloys, lower than quite a few pressures and temperatures. due to the loss of periodicity the standard options for the learn of constitution and actual homes now not paintings, and new concepts must be built. This publication bargains with the characterisation of the constitution, the constitution decision and the examine of the actual homes, specifically dynamical and digital houses of aperiodic crystals. The therapy relies on an outline in an area with extra dimensions than 3, the so-called superspace. this permits us to generalise the traditional crystallography and to appear another way on the dynamics. the 3 major sessions of aperiodic crystals, modulated stages, incommensurate composites and quasicrystals are handled from a unified standpoint, which stresses similarities of some of the structures. The ebook assumes as a prerequisite an information of the elemental concepts of crystallography and the speculation of condensed subject, and covers the literature on the leading edge of the sector.