| 单词 | plastic crystal |
| 释义 | > as lemmasplastic crystal plastic crystal n. †(a) a variety of Portland cement that can be easily moulded or shaped (obsolete); (b) a soft substance in which the molecules occupy the points of a regular crystal lattice but have freedom of rotation about those points. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal types > [noun] negative crystal1831 plastic crystal1877 liquid crystal1891 cholesteric1965 mesomorph1969 1877 N.Y. Times 2 Sept. 9/4 The plastic crystal of dinas is described by C. Bis[c]hof as a species of Portland cement. 1926 Proc. Royal Soc. A. 112 346 Metallurgists..have recently become familiar with the conception of a plastic crystal which yields by slipping on a crystal plane. 1974 P. A. Winsor in G. W. Gray & P.A. Winsor Liquid Crystals & Plastic Crystals I. ii. 48 Plastic crystals separate in the crystal forms of the cubic system (rarely hexagonal) and to this extent resemble ordinary solid crystals. However, they show unusually low yield points. The most plastic..will flow under their own weight and although the majority are less soft, they may readily be cut with a knife or extruded through a small hole. < as lemmas |
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