New Step by Step Map For Crystal
New Step by Step Map For Crystal
Blog Article
天然的水晶一般都会有絮状（绵绺），也就是大家俗称的瑕疵，这是液体水落石出和二氧化碳的小孔穴，而人工合成的水晶就不会有这样的特征。
By clicking “Take All Cookies�? you agree to the storing of cookies in your device to improve website navigation, review website use, and support within our internet marketing attempts.
A primary notion in crystal constructions will be the unit cell. It is the smallest unit of quantity that allows equivalent cells to become stacked with each other to fill all Room. By repeating the pattern from the unit cell over and over in all Instructions, all the crystal lattice can be made. A dice is the simplest illustration of a unit cell. Two other illustrations are shown in Determine 1. The 1st will be the unit cell for a experience-centred cubic lattice, and the second is for any entire body-centred cubic lattice. These structures are discussed in the subsequent paragraphs.
Encyclopaedia Britannica's editors oversee issue places wherein they have considerable know-how, irrespective of whether from years of expertise received by engaged on that written content or via analyze for an advanced degree. They create new articles and confirm and edit written content acquired from contributors.
2She was putting on a strand of crystal beads.她戴着一串水晶珠子。《柯林斯英汉双解大词典》
⑧、雕刻：立体感强，工艺高，做工精细，成本高。分手工雕刻图形、机器雕刻文字。
⑩、雷射内雕：以计算机辅助激光设备在水晶对象中进行三维图案的成型，艺术效果好，可以任意表达各类图案，图形，达到逼真效果
Crystals can be developed less than moderate circumstances from all ninety two get more info By natural means transpiring components besides helium, and helium can be crystallized at minimal temperatures through the use of 25 atmospheres of pressure.
Numerous crystals behave like butter in that they're tricky at small temperatures but tender at higher temperatures. They are referred to as solids at all temperatures beneath their melting point. A achievable definition of the stable is an object that retains its condition if remaining undisturbed. The pertinent concern is just how long the item keeps its condition. A really viscous fluid retains its shape for an hour although not a 12 months. A reliable must preserve its form extended than that.
英语-中文（简体） phrase #beta Beta /beta #preferredDictionaries ^selected identify /picked /preferredDictionaries
被主体水晶所捕获的包裹体。原生包裹体通常为固相，形态较规则。水晶中典型的原成包裹体有金红石、电气石、黄铁矿等，也会见到岩石碎屑或集合体。
Fig. one: Schematic of crystal development from creating blocks composed of a particle Main and also a shell of DNA ligands attached to the particle surface.
The construction of the sodium atoms by itself, or perhaps the chlorine atoms alone, is fcc and defines the unit cell. The sodium chloride framework As a result is designed up of two interpenetrating fcc lattices. The cesium chloride lattice (Determine 3A) is based around the bcc composition; every single other atom is cesium or chlorine. In such cases, the unit mobile is a cube. The third vital structure for AB
Binary crystals are present in numerous constructions. Some pairs of aspects form multiple framework. At place temperature, cadmium sulfide might crystallize both from the zinc blende or wurtzite framework. Alumina also has two probable structures at room temperature, α-alumina (corundum) and β-alumina. Other binary crystals show distinct structures at unique temperatures. Among the many most sophisticated crystals are Individuals of silicon dioxide (SiO2), that has seven distinct structures at various temperatures and pressures; the most common of those constructions is quartz.