cesium — LLMpedia

cesium
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Name	Cesium
Atomic number	55
Atomic weight	132.90545
Phase	Solid (room temperature)
Category	Alkali metal
Appearance	Silvery-gold metal

Contents

cesium

Cesium is a soft, silvery-gold alkali metal known for extreme reactivity, low melting point, and utility in timekeeping and electronics. Discovered in the 19th century, it has influenced developments linked to Royal Society, Max Planck Institute for Radio Astronomy, National Institute of Standards and Technology, International Bureau of Weights and Measures, and Cambridge University laboratories. Its properties intersect research at institutions such as Massachusetts Institute of Technology, University of Oxford, California Institute of Technology, Imperial College London, and ETH Zurich.

Characteristics

Cesium exhibits a face-centered cubic crystal structure studied by researchers at Cavendish Laboratory, Rutherford Appleton Laboratory, and Lawrence Berkeley National Laboratory; it has a melting point near 28.5 °C documented in datasets curated by International Union of Pure and Applied Chemistry. Spectroscopy of the metal features lines measured by teams at Royal Observatory Greenwich, Yale University Observatory, University of Tokyo Observatory, Max Planck Institute for Physics, and Harvard College Observatory. Physical properties including density and electrical conductivity are referenced in materials compiled by American Chemical Society, Royal Society of Chemistry, Bureau of Mines, National Research Council, and Institute of Physics. Its electron configuration and relativistic effects are topics in theoretical works from Princeton University, University of Cambridge, Stanford University, Carnegie Institution for Science, and Los Alamos National Laboratory.

Natural occurrence of cesium is primarily in pollucite and lepidolite deposits historically mined in locations such as Bernic Lake, Zacatecas, Bernwitz, Manitoba, Zimbabwe pegmatites and the Bernic Lake pegmatite, with significant operations involving companies like AlliedSignal, BHP, Rio Tinto, Lynas Corporation, and Ernest Oppenheimer. Commercial extraction and processing techniques were developed through projects at US Geological Survey, Geological Survey of Canada, British Geological Survey, Ministry of Energy and Mines (Brazil), and corporate research at Cabot Corporation and Dow Chemical Company. Refining and isotope separation methods use facilities such as Oak Ridge National Laboratory, Argonne National Laboratory, CERN, Brookhaven National Laboratory, and Japan Atomic Energy Agency. Global supply chains connect mines to markets in United States, Canada, China, Australia, and Russia.

Cesium forms salts and coordination compounds whose synthesis and crystallography are reported by researchers at Max Planck Society, CNRS, Scripps Research Institute, Weizmann Institute of Science, and Brookhaven National Laboratory. Notable compounds such as halides, hydroxides, and organometallic derivatives have been studied at California Institute of Technology, University of Chicago, University of Pennsylvania, Columbia University, and University of Michigan. Reactions with water and oxygen that yield vigorous exothermic behavior were demonstrated in safety protocols at Occupational Safety and Health Administration, National Institute for Occupational Safety and Health, Federal Institute for Occupational Safety and Health, Health and Safety Executive, and Japanese Ministry of Health, Labour and Welfare. Catalysis and ionic conduction studies involving cesium-containing catalysts and solids appear in literature from BASF, DuPont, Dow Chemical Company, Johnson Matthey, and AkzoNobel.

Primary applications include atomic clocks, photoelectric cells, and vacuum tubes, technologies advanced at National Institute of Standards and Technology, National Physical Laboratory (UK), European Space Agency, NASA Jet Propulsion Laboratory, and Roscosmos. Cesium-based frequency standards underpin systems operated by Global Positioning System, Galileo (satellite navigation), BeiDou Navigation Satellite System, GLONASS, and timing infrastructure at financial exchanges such as New York Stock Exchange. Use in oil and gas drilling fluids, ion propulsion, and medical research connects to corporations and centers like Schlumberger, Halliburton, SpaceX, Blue Origin, and CERN Medical Applications. Optical and spectroscopic utilities have been developed at Bell Laboratories, Siemens AG, Sony Corporation, Panasonic, and Sharp Corporation.

Category:Alkali metals