| 释义 |
polycrystalline, a.|pɒlɪˈkrɪstəlaɪn|
[f. poly- + crystalline a. and n.]
Composed of many crystals or crystallites; having a crystalline structure in which there is a random variation in the orientation of different parts.
1925Proc. R. Soc. A. CIX. 144 The figures for single crystals are higher than for the polycrystalline test piece. 1932Ibid. CXXXVIII. 364 A polycrystalline wire can be considered as an assemblage of crystallites in which the axes of crystal symmetry are oriented at random. 1950Sci. News XV. 61 Distorted lattice planes will not slide over one another easily and hence polycrystalline metals are often hard. 1959Times Rev. Industry Mar. 32/3 Fine grinding stone..consisting of a sintered polycrystalline ruby material. 1970Sci. Jrnl. Feb. 46/1 Bulk metals are polycrystalline and the grains are randomly oriented.
Hence ˌpolycrystaˈllinity, polycrystalline condition or structure.
1955Rep. Progress Physics XVIII. 233 Research on these materials has been impeded by the anomalous effects of polycrystallinity. 1978Nature 19 Oct. 634/1 There was evidence of polycrystallinity with definite, but usually very weak, X-ray lines assignable to diamond. |