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cesium phosphate is an alkali metal compound composed of the element cesium and phosphorus. This colorless, silver-white metal is used in photomultiplier tubes and vacuum tubes, infrared lamps, semiconductors, photographic emulsions, and high-power gas-ion devices, as well as radioactive 137Cs for nuclear medicine.
It is soluble in water and aqueous alcohols, but slightly soluble in alkaline solutions such as NaOH and KOH. It is a moderately toxic metal with a body half-life of 70-109 days in humans (ATSDR, 2004). Ingestion of cesium salts can cause loss of appetite, nausea, vomiting, and diarrhea.
Carol Ann Click, Missouri S&T Abstract
The chemical and structural properties of a series of cesium phosphate glasses, XCs2O*(1-X)P2O5 (X = 1-16 mole% Cs2O), were investigated using X-ray powder diffraction, thermogravimetric, and differential thermal analysis. The results show that the glass compositions are influenced by the Cs/P molar ratio and the temperature of the treatment. The X-ray crystallinity decreases with increasing Cs/P molar ratio and temperature, and is more affected by the treatment temperature than the Cs/P molar ratio. The 31P magic angle spinning nuclear magnetic resonance spectra reveal that the addition of cesium oxide leads to the conversion of the 3D ultraphosphate network to the chain metaphosphate glass structure, with a break in the Q2 isotropic chemical shift (diso) at about 35 mole% Cs2O.
The ion exchange process that takes place in the formation of Cs-MPS-1 reaches equilibrium within a short time (15 min) following pseudo-second-order kinetics, owing to the favorable interactions between cesium and phosphate ions. This compound reversibly captures Cs+ and can be regenerated by treating with a solution of KCl.