Scandium fluoride (ScF3) is an inorganic compound that exists in the form of white powder or porous particles. It is mainly prepared by the reaction of scandium and fluorine, and can also be prepared by the reaction of scandium trioxide extracted from scandium yttrium stone and ammonium hydrogen fluoride at high temperatures. Scandium fluoride has a unique negative thermal expansion capacity, that is, it shrinks when heated, which is of great significance in materials science.
Scandium fluoride has important applications in many fields, such as as a raw material for making scandium metal, and as an additive to improve the properties of alloys. It is insoluble in water but easily soluble in acid, and can form a complex with fluoride solution, which makes it valuable in the chemical industry.