Cesium Bromide

Cesium Bromide powder is a white crystalline powder composed of cesium ions (Cs⁺) and bromide ions (Br-), which has many applications in the fields of optics and chemical analysis.

Characteristics

Appearance: Usually white powder.

Density: Relatively high, approx. 4.43 g/cc.

Melting point: 636°C, belongs to the higher melting point of the compound, 600 ° C or more melting, above the melting point can be sublimated without decomposition.

Boiling point: 1300°C.

Refractive index: 1.6984

Crystal structure: similar to CsCl, belongs to the cubic crystal system

Solubility: Soluble in water, about 55g of cesium bromide can be dissolved in 100ml of water at 20°C. It is also soluble in ethanol.

Chemical formula: CsBr, an ionic compound formed by caesium and bromine.

Molecular weight: 212.809 g/mole

Stability: Stable in air, will not decompose if used and stored according to specifications, but should avoid contact with moisture or humidity.

Magneticity: Magnetisation is -67.2 x 10-⁶ cm3/mole.

Application

In the field of analytical chemistry:

Analytical reagents: used in various chemical analysis processes, e.g. as auxiliary reagents in spectroscopic and chromatographic analyses to help detect and analyse the composition and properties of other substances. Due to their chemical stability and specific spectral properties, they can be used to improve the accuracy and sensitivity of analyses.

Optical field:

X-ray fluorescent screens: Cesium bromide powder is used to make fluorescent screens in X-ray imaging equipment. When X-rays are irradiated onto the phosphor screen, cesium bromide absorbs the X-rays and converts them into visible light so that the X-ray image can be observed by the naked eye.

Prisms for spectrometers: Because cesium bromide has a high refractive index and good optical properties, it is used to make prisms for spectrometers. A spectrometer is an instrument used to analyse the spectra of substances, and prisms are able to separate light of different wavelengths for spectral analysis.

Optical Window Material: In some special optical instruments or equipment, cesium bromide powder can be made into an optical window that allows light of a specific wavelength to pass through while blocking other wavelengths of light or other interfering substances.

Beam splitter components in broadband spectrophotometers: In broadband spectrophotometers, cesium bromide can be used as a beam splitter material to split a beam of light into two or more beams for different optical measurements and analyses.

Optoelectronic materials field:

Involved in the preparation of chalcogenide materials: for example, cesium bromide is one of the important raw materials in the preparation of optoelectronic materials such as all-inorganic chalcogenide quantum dots. Chalcogenide materials have excellent photovoltaic properties and have broad application prospects in devices such as solar cells, light-emitting diodes, photodetectors, and quantum dot lasers.

Other fields:

Biomedical research: In some biomedical research, cesium bromide can be used in cell culture, separation of biomolecules, etc. However, the applications in this area are relatively few and need further research and verification.

Nuclear physics research: Due to the nuclear physics properties of caesium, caesium bromide may have certain applications in nuclear physics experiments and research, but this is also a more specialised and specific field.