Lanthanum iodide is an off-white orthorhombic crystal with strong hygroscopicity. Its melting point is 772°C and the relative density is 5.63. It is very soluble in water and soluble in acetone.
The preparation method
Lanthanum iodide is obtained by heating carbide in iodine vapor, or vacuum evaporation of carbide in hydroiodic acid solution.
The application range
CN201510782817.3 discloses a sol-gel preparation method of a glass film containing cerium ions doped with lanthanum bromide microcrystals, which is characterized in that the molar percentage of the preparation raw materials is divided into: ethyl orthosilicate: 65–70 mol%, three borate N-Butyl ester: 10–24mol%, lanthanum iodide: 10–15mol%, rare earth iodide: 1–5mol%, where the rare earth iodide is one of cerium iodide, europium iodide or terbium iodide; the advantages are Sol-gel is a low-temperature wet chemical glass preparation technology. The glass is obtained through the hydrolysis and polymerization chemical reaction process of precursor raw materials. Therefore, it can be prepared into thin film materials under a certain liquid viscosity, and low-temperature synthesis conditions can be effective to prevent the decomposition and volatilization of iodide raw materials; the glass prepared by the sol-gel method will generate certain micropores in the material due to the volatilization and decomposition of the solvent. These micropores provide a good environment for the generation of nano-iodide crystallites. Therefore, it can overcome the incomplete uniformity of the chemical composition of the molten glass and the incomplete crystallization treatment temperature, which leads to the inhomogeneity of the crystallization particles and the devitrification of the glass.
CN200610064013.0 describes a scintillator material based on a certain lanthanide halide matrix material. In one embodiment, the matrix material includes a mixture of lanthanide halides, that is, a solid solution of at least two of the halides, such as lanthanum chloride and lanthanum bromide. In another embodiment, the matrix material is based on lanthanum iodide alone, which must be substantially free of lanthanum iodide. The scintillator material may be in the form of single crystal or polycrystal, which also includes an activator for the matrix material, such as cerium. In order to further improve the stopping power and scintillation efficiency of these halide scintillators, it is disclosed that bismuth is added thereto. The invention also describes a radiation detector using the scintillator and a related method for detecting high-energy radiation.
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