QUASI-CRYSTALLINE ALLOY THIN FILMS, THEIR PREPARATION AND USE

摘要

PCT No. PCT/FR96/00494 Sec. 371 Date Oct. 6, 1997 Sec. 102(e) Date Oct. 6, 1997 PCT Filed Apr. 2, 1996 PCT Pub. No. WO96/31640 PCT Pub. Date Oct. 10, 1996Thin film of quasicrystalline alloy having a thickness of between approximately 0.01 and 10 mu m comprising one or more quasicrystalline phases having a volume which represents at least 60% by volume of the quasicrystalline alloy, a quasicrystalline phase being either a quasicrystalline phase which exhibits rotational symmetries normally incompatible with a translational symmetry, i.e., symmetries with a 5-, 8-, 10- and 12-fold rotation axis, or an approximant phase or an approximant compound which is a true crystal, the approximant phase or compound having a crystallographic structure which remains compatible with the translational symmetry, but which has, in an electron diffraction photograph, diffraction patterns whose symmetry is close to that of 5-, 8-, 10- or 12-fold rotation axes; wherein the alloy has the following nominal composition, which is given in atomic percentages: AlaRerSisXdMnm in which X represents at least one element chosen from B, C, P, S and Ge; 15