Detailed Notes on Crystal
Detailed Notes on Crystal
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Not all crystals are equally crystalline. There are often impurities, as well as ionic & covalent involving molecules can generate vastly unique structures out of precisely the same materials. An excellent illustration of this are diamonds and graphene.
①压电效�?在机械力(压力或拉�?作用下，水晶单晶体的两端会产生电荷，其电量相等但符号相反。在工业上，无色、无缺陷、不具双晶的水晶常被用来作压电石英片。
水晶文化历史悠久，古人曾赋予它一串极富美感的雅称：水玉、水精、水碧、石英等。
Fig. seven: A template-directed technique can control The position of developing blocks over a surface area while in the development of elaborate constructions.
25If you're a Billy Crystal enthusiast, you are going to love this film.如果你是比利·克里斯特尔的影迷，你就会喜欢这部电影。《柯林斯英汉双解大词典》
Encyclopaedia Britannica's editors oversee issue locations where they have substantial know-how, no matter if from yrs of working experience acquired by engaged on that content material or via analyze for a complicated degree. They compose new content material and validate and edit information gained from contributors.
时尚的收藏爱好者喜欢收藏天然水晶，却常常因为在市场上面对大量的合成水晶看走了眼。市面上的水晶：
发晶：无色、浅黄、浅褐等，可因含金红石常呈金黄、褐红等色，含电气石常呈灰黑色；含阳起石而呈灰绿色。
24I want to make my indicating crystal distinct.我想把我的意思解释得清清楚楚。《牛津词典》
⑤化学稳定�?非常好，在常温下仅溶解于氢氟酸，不溶解于其它各类酸、碱。在高温高压条件下可溶解于碳酸钠溶液中。
看孔眼：对于缀穿水晶制品（如项链、手链、佛珠），要看孔眼是否平直，孔的粗细是否均匀，有无细小裂纹。孔壁必须清澈透明，无“白痕”。
Crystallography could be the study of crystals, and it offers with every little thing from perfect geometric designs to seemingly random conglomerations of particles and minerals.
Crystals are categorised on the whole types, such as insulators, metals, semiconductors, and molecular solids. An individual crystal of the insulator is normally clear and resembles a piece of glass. Metals are shiny Except if they have got rusted. Semiconductors are sometimes shiny and sometimes transparent but are never ever rusty. Many crystals can be classified as just one form of solid, while some have intermediate conduct. Cadmium sulfide (CdS) could be ready in pure sort and is a wonderful insulator; when impurities are additional to cadmium sulfide, it gets a fascinating semiconductor.
Binary crystals are found in a lot of structures. Some pairs of features form more than one construction. At room temperature, cadmium sulfide could crystallize both from the zinc blende or wurtzite structure. Alumina also has two possible buildings at room temperature, α-alumina (corundum) and β-alumina. Other binary crystals exhibit distinct constructions at diverse temperatures. Amongst the most intricate more info crystals are People of silicon dioxide (SiO2), that has seven distinct structures at several temperatures and pressures; the commonest of those buildings is quartz.