Rhodium Foil_Sheet _Disc _Rod_Wire

- Physical properties: It has a face - centered cubic lattice structure. Its melting point is 1966±3℃, boiling point is 3727±100℃, and density is 12.41g/cm³ (at 20℃). It exhibits good electrical and thermal conductivity.

- Chemical properties: Chemically stable, it does not react with air at room temperature and is not easily oxidized. When heated, it can form rhodium(III) oxide (Rh₂O₃) in the air. Except for spongy rhodium, rhodium in general forms is insoluble in aqua regia, but soluble in molten alkalis and potassium bisulfate. In nature, it mostly exists in a free state and often co - exists with other platinum - group elements in ores. Due to its scarce production and difficult extraction, it is extremely expensive.

- Applications:

- Catalysis: It is a crucial catalyst. Rhodium alloys, rhodium - containing compounds, and complexes are widely used in the production of aldehydes and acetic acid, purification of automotive exhaust gases, ammonia oxidation in nitric acid production, and in the synthesis of organic chemicals such as plastics, man - made fibers, pharmaceuticals, and pesticides, as well as in fuel cell electrodes.

- Optics: With a high and stable reflectivity to visible light, it is often used for the coating of reflectors in special industrial mirrors, searchlights, radars, etc.

- Corrosion resistance and high - temperature stability: It can be used to make corrosion - resistant containers. Pure rhodium crucibles are employed in the production of calcium tungstate and lithium niobate single crystals.

- Electronics: Rhodium - plated composites are excellent electrical contact materials. It is also used for the coating of jewelry and other industrial instruments and gas - sensitive elements. It can form solid solutions or compounds with other metals, playing roles such as solid - solution strengthening or dispersion strengthening. For example, platinum - rhodium alloys are excellent precious metal temperature - measuring materials.