BARIUM SELENIDE Struktur

Bariumselenid

Bezeichnung:Bariumselenid

CAS-Nr1304-39-8

Englisch Name:BARIUM SELENIDE

CBNumberCB1216752

SummenformelBaSe

Molgewicht216.29

MOL-Datei1304-39-8.mol

Synonyma

Bariumselenid

Bariumselenid physikalisch-chemischer Eigenschaften

Schmelzpunkt	1780°C
Dichte	5.02
Löslichkeit	reacts with H2O
Aggregatzustand	cubic crystalline powder
Farbe	white or reddish
Wasserlöslichkeit	decomposed by H2O [MER06]
CAS Datenbank	1304-39-8
EPA chemische Informationen	Barium selenide (BaSe) (1304-39-8)

BARIUM SELENIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

Beschreibung
Barium selenide has the molecular formula of BaSe and the molecular weight of 216.2956 g/mol. Its CAS number is 1304-39-8. It is a white crystalline powder having a melting point of 1782°C. Its density is 5.02 g/cm³. It reacts with water so that an aqueous method of precipitation cannot be used to prepare this compound. Barium selenide is very moisture sensitive, and must be handled under inert conditions. It can be prepared by reaction of the oxide or carbonate with Se, or by the reduction of the selenate with hydrogen gas:
2BaCO3+ 5Se+ Heat ? 2BaSe+ 3SeO2+ CO2
BaSeO4+ 4H2 ? BaSe+ 4H2O
Strontium selenide and barium selenide both have a simple cubic structure, with cube edges equal to 3.117? and 3.308 ? , respectively.
Chemische Eigenschaften
Crystalline powder. Decomposes in water.
Verwenden
Barium selenide has been used to construct a photocell that has been used extensively to measure the solar irradiance of the Sun at various points on the globe. It is used because other photocell elements like selenium tend to decline in output and saturate under the intense radiance of the Sun. BaSe remains quasi-linear and can be used to measure intensity from 2000 ? to 7200 ? using a double monochrometer as a spectrum analyzer. As a portable unit, it uses narrowband (20–50 ? halfwidth) interference glass filters in 14 steps as a spectrum analyzer over the range 3100 ? to 16,300 ? , but the recording is manual. The field of view is <3° of the solar irradiance over the face of the Sun.
BaSe is available commercially as a sputtering target or in limited quantities as a powder.
Verwenden
In photocells, semiconductors.
Synthese
BaSeO4 + 4 H2 = BaSe + 4 H2O
The selenate (about 1 g.) is distributed in a thin layer over a quartz boat 10 cm. long and 1 cm. wide. The drying at 200°C is repeated, this time in a reaction tube and in a stream of N2. Reduction in a stream of H2 follows. It should continue for two hours at 500°C for BaSeO4.

Bariumselenid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

1304-39-8, BARIUM SELENIDE Verwandte Suche:

Send Inquriy