Cesium Metal

Overview of Caesium

Caesium (Cs), atomic number 55, is a highly reactive alkali metal known for its silvery-gold appearance and low melting point of 28.5°C. It was discovered in 1860 by Robert Bunsen and Gustav Kirchhoff using flame spectroscopy. The name "caesium" comes from the Latin word "caesius," meaning "sky blue," due to its blue spectral lines. Caesium is primarily found in the mineral pollucite, which is the main commercial source.

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Properties and Applications

Caesium's notable properties include its high reactivity, low ionization energy, and high electropositivity. These properties make it valuable in various high-tech applications, such as atomic clocks, where its precise frequency standards are used to define the second. Caesium formate, a salt of caesium, is widely used in the oil and gas industry as a drilling fluid due to its high density and low toxicity. Additionally, caesium compounds are utilized in medical imaging, electronics, and chemical synthesis.

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Market and Supply

The largest and richest known source of caesium is the Tanco Mine in Manitoba, Canada, which contains significant pollucite deposits. Caesium production is relatively limited, with annual global output ranging from 5 to 10 metric tons. The high reactivity and specialized applications of caesium contribute to its market value. Suppliers often stock caesium in hermetically sealed containers to prevent its rapid oxidation and ensure safe delivery to customers in various advanced technology sectors.