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Bulk caesium iodide crystals have the cubic CsCl crystal structure, but the structure type of nanometer-thin CsI films depends on the substrate material – it is CsCl for mica and NaCl for LiF, NaBr and NaCl substrates. [9] Caesium iodide atomic chains can be grown inside double-wall carbon nanotubes. In such chains I atoms appear brighter ...
Cerium diiodide can be obtained from the reduction of cerium(III) iodide with metallic cerium under vacuum at 800 °C to 900 °C. [2] Ce + 2 CeI 3 → CeI 2. It can also be formed from the reaction of cerium and ammonium iodide in liquid ammonia at −78 °C. The reaction forms an ammonia complex of cerium diiodide, which decomposes to cerium ...
Cerium metal reacts with iodine when heated to form cerium(III) iodide: [2] 2 Ce + 3 I 2 → 2 CeI 3. It is also formed when cerium reacts with mercury(II) iodide at high temperatures: [2] 2 Ce + 3 HgI 2 → 2 CeI 3 + 3 Hg
[1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [4] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
Caesium triiodide is an inorganic compound, with the chemical formula of CsI 3. It can be prepared by slow volatilization and crystallization of caesium iodide and iodine in aqueous ethanol solution. [ 3 ]
Another application of thallium doping is the sodium iodide and cesium iodide crystals in gamma radiation detection devices. In these, the sodium iodide crystals are doped with a small amount of thallium to improve their efficiency as scintillation generators. [53] Some of the electrodes in dissolved oxygen analyzers contain thallium. [9]
CsI(Na) or cesium iodide doped with sodium: the crystal is less bright than CsI(Tl), but comparable in light output to NaI(Tl). The wavelength of maximum emission is at 420 nm, well matched to the photocathode sensitivity of bi‑alkali PMTs. It has a slightly shorter decay time than CsI(Tl) (630 ns versus 1000 ns for CsI(Tl)).