Barium Carbonate (BaCO3)-Powder

Characteristic

Barium carbonate (BaCO₃), also known as witherite, is a chemical compound used in rat poison, bricks, ceramic glazes and cement.

Chemical formula：BaCO₃

Molar mass：197.34 g/mol

Appearance：white crystals

Odor：odorless

Density：4.286 g/cm³

Melting point：811 °C (1,492 °F; 1,084 K)

polymorphic transformation

Boiling point：1,450 °C (2,640 °F; 1,720 K)

                         decomposes from 1360 °C

Solubility in water：16 mg/L (8.8°C)

                                 22 mg/L (18 °C)

                                 24 mg/L (20 °C)

                                 24 mg/L (24.2 °C)

Solubility product (Ksp)：2.58·10⁻⁹

Solubility：decomposes in acid

                   insoluble in methanol

Magnetic susceptibility (χ)：-58.9·10⁻⁶ cm³/mol

Refractive index (nD)：1.676

Application

Barium carbonate is widely used in the ceramics industry as an ingredient in glazes. It acts as a flux, a matting and crystallizing agent and combines with certain colouring oxides to produce unique colours not easily attainable by other means. Its use is somewhat controversial since some claim that it can leach from glazes into food and drink. To provide a safe means of use, BaO is often used in fritted form.

In the brick, tile, earthenware and pottery industries barium carbonate is added to clays to precipitate soluble salts (calcium sulfate and magnesium sulfate) that cause efflorescence.