![]() ![]() Amorphous solid is a solid, which lacks a crystalline structure. In a structure like this, number of single crystals is held together by a layer of amorphous solids. Most of the time solids are polycrystalline. However, these occur very rarely in nature. There are solids, which are composed of a single crystal like gems, silicon single crystals. The crystals in a polycrystalline solid are microscopic, and they are known as crystallites. These are arranged in different orientations and are bound by highly defective boundaries. Polycrystalline are solids that are composed of many numbers of small crystals. In nature, most of the time, crystals appear to have disrupted their long-range order. For example, these can be sparkly, transparent or clear, or have the structure similar to a crystal. Other than being a crystal, some solids may resemble a crystal by adopting some of its properties. Crystals have an aesthetic value, and it is believed to have healing properties thus, people use them to make jewelry. Crystals can have different shapes and colors. sodium chloride), and molecular crystals (e.g. Crystals can be categorized according to their physical and chemical properties. There are water-based crystals in the form of snow, ice or glaciers. For example, calcite is produced by mollusks. Crystals are formed by living organisms too. But, crystals are not restricted to minerals: they comprise most solid matters such as sugar, cellulose, metals, bones, and even DNA.” 1 Crystals are naturally occurring as large crystalline rocks on earth, such as quartz, granite. Examples are halite, salt (NaCl), and quartz (SiO 2). By definition, “a crystal is a homogenous chemical compound with a regular and periodic arrangement of atoms. In crystalline solids, there is a regular, repeating pattern thus, we can identify a repeating unit. The atoms, molecules, or ions in crystals are arranged in a particular manner, thus have a long-range order. Crystalline solids or crystals have ordered structures and symmetry. Here, we will look into the differences between crystalline and polycrystalline in detail.Ĭrystalline can be a crystal, composed of crystal, or resemble a crystal. Polycrystalline is such a variation from the crystalline solids. Most of the time, they are mixed together or form variations. Although we define solids as crystalline or amorphous, in nature there are few examples of these pure forms.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |