Skosmos: SampleDescriptionVocabulary-1: Polycrystal

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Polycrystal

1. Composed of more than one crystal (Merriam-Webster dictionary). 2. A polycrystal is the usual form of solid matter, such as a lump of metal or ceramic, and is made up of millions of individual crystals. (ScienceDirect, Encyclopedia of Materials: Science and Technology, 2002). 3. A polycrystal refers to a grain structure consisting of multiple grains with different orientations, where each grain is represented by a cubic polyhedron. The grains are arranged in a cubic form, and the boundaries between them are determined by the crystal lattice. (ScienceDirect, AI generated definition based on: Superplasticity and Grain Boundaries in Ultrafine-Grained Materials (Second Edition), 2021). 4. any solid object composed of randomly oriented crystalline regions, called crystallites, especially as distinguished from a single crystal (Britannica). 5. Single crystals form only in special conditions. The normal solid form of an element or compound is polycrystalline. As the name suggests, a polycrystalline solid or polycrystal is made up of many crystals. The properties of a polycrystal are notably different from those of a single crystal. The individual component crystallites are often referred to as grains and the junctions between these grains are known as grain boundaries. (https://www.doitpoms.ac.uk/tlplib/atomic-scale-structure/poly.php)

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