Caesiumiodid

Bezeichnung:Caesiumiodid

CAS-Nr7789-17-5

Englisch Name:Cesium iodide

CBNumberCB8471666

SummenformelCsI

Molgewicht259.81

MOL-Datei7789-17-5.mol

Synonyma

Caesiumiodid

Caesiumiodid physikalisch-chemischer Eigenschaften

Schmelzpunkt	626 °C (lit.)
Siedepunkt	1280 °C
Dichte	4.51 g/mL at 25 °C (lit.)
Brechungsindex	1.7876
Flammpunkt	1280°C
storage temp.	Keep in dark place,Inert atmosphere,Room temperature
Löslichkeit	soluble in ethanol, methanol, acetone
Aggregatzustand	beads
Farbe	White
Wichte	4.51
PH	pH(50g/l, 25℃) : 5.0～9.0
Wasserlöslichkeit	74 g/100 mL (20 ºC)
Sensitive	Hygroscopic
Merck	14,2014
Expositionsgrenzwerte	ACGIH: TWA 0.01 ppm
Dielectric constant	5.6（Ambient）
Stabilität	Stable. Deliquescent.
CAS Datenbank	7789-17-5(CAS DataBase Reference)
NIST chemische Informationen	Cesium iodide(7789-17-5)
EPA chemische Informationen	Cesium iodide (CsI) (7789-17-5)

Sicherheit

Kennzeichnung gefährlicher	Xn,Xi
R-Sätze:	36/37/38-42/43-43
S-Sätze:	22-36/37-45
RIDADR	UN 3077 9 / PGIII
WGK Germany	2
RTECS-Nr.	FL0350000
F	8
TSCA	Yes
HS Code	28276000
Toxizität	LD50 i.p. in rats: 1.4 g/kg (Cochran)

Gefahreninformationscode (GHS)

Cesium iodide Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R42/43:Sensibilisierung durch Einatmen und Hautkontakt möglich.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
Chemische Eigenschaften
white crystalline powder
Verwenden
Cesium iodide is used in FT-IR (Fourier Transform Infrared Spectrometers) as a beamsplitter. Cesium Iodide exhibits high gamma-ray stopping power. Useful as input phosphor in fluoroscopy equipment, and efficient photocathode for extreme ultraviolet wavelengths. Fast and dense scintillating material - useful in electromagnetic calorimetry in particle physics.
Verwenden
Cesium iodide (CsI) is a kind of ionic compound that has been widely used as scintillators in many areas such as X-ray image intensifier tubes, photocathodes, and display devices.
Cesium iodide is used in scintillation counters(Geiger counters) to measure levels of external radiation. It is also useful as a "getter" to remove air molecules remaining in vacuum tubes.
Cesium Iodide is a material with high γ-ray stopping power due to its relative high density and atomic number. For scintillation counting, it is used either in its un-doped form or doped with sodium or thallium.
CsI is resistant to thermal and mechanical shock. The physical characteristics of CsI are independent of the activator used. Compared to NaI(Tl), it is relatively soft and plastic, and does not cleave. Because it has no cleavage plane, it is quite rugged-which makes it well-suited for well logging, space research or other applications where severe shock conditions are encountered.
Verwenden
Prisms for infrared spectroscopy; in x-ray fluorescent screens, scintillation counters.
Vorbereitung Methode
A single crystal can be grown from a melt solution by both the Kyropoulus method and the Stockbarger method.
Allgemeine Beschreibung
Cesium iodide is a simple ionic salt. It has the capacity to undergo second order transformation from cubic B2 structure to body-centered tetragonal structure at low pressures. It is mostly used as input screens of X-ray image intensifiers.
Flammability and Explosibility
Non flammable
Sicherheitsprofil
Moderately toxic by ingestion and intraperitoneal routes. See also CESIUM and IODIDES. When heated to decomposition, it emits toxic fumes of I-.
Synthese
The main method for preparing cesium iodide-based single crystals is Kyropoulos growth, which allows one to obtain cylindrical ingots weighing up to several tens of kilograms.
Cs2CO3+ 2HI→2CsI+H2O+CO2↑
Technically, pure CsI was prepared by dissolving cesium carbonate in hydriodic acid at room temperature in a vessel from niobium, which was nonreactive with cesium iodide at elevated temperatures. The solution was heated to boiling at pH 3 to completely dissolve the caesium carbonate because the niobium vessel was unstable in an acid medium.The hot solution was filtered and boiled down at a temperature near 393 K. After crystallization, the material was vacuum-dried in a quartz ampule[4].
Solubility in water
Cesium iodide is soluble in water, with a solubility of 44/100 g H2O (0℃ and 160/100 g H2O (61℃). It is soluble in alcohol. One should handle it carefully, because it is deliquescent.
läuterung methode
Crystallise it from warm water (1mL/g) by cooling to -5o.
Structure and conformation
The space lattice of CsI belongs to the cubic system, and its cesium chloride structure has a lattice constant of a=0.8529 nm.

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