Cadmiumselenid

Bezeichnung:Cadmiumselenid

CAS-Nr1306-24-7

Englisch Name:CADMIUM SELENIDE

CBNumberCB6107419

SummenformelCdSe

Molgewicht191.37

MOL-Datei1306-24-7.mol

Synonyma

Cadmiumselenid

Cadmiumselenid physikalisch-chemischer Eigenschaften

Schmelzpunkt	>1350°C
Dichte	5.81 g/mL at 25 °C(lit.)
Brechungsindex	2.87 (900 nm)
storage temp.	2-8°C
Löslichkeit	insoluble in H2O
Aggregatzustand	granular
Farbe	Brown-red to black
Wichte	5.81
Wasserlöslichkeit	Insoluble in water.
Sensitive	air sensitive, store cold
Crystal Structure	Hexagonal, Wurtzite (Zincite) Structure - Space Group P 63mc
Merck	14,1626
Expositionsgrenzwerte	ACGIH: TWA 0.01 mg/m3; TWA 0.002 mg/m3; TWA 0.2 mg/m3 NIOSH: IDLH 9 mg/m3; IDLH 1 mg/m3; TWA 0.2 mg/m3
Stabilität	store cold
CAS Datenbank	1306-24-7(CAS DataBase Reference)
EPA chemische Informationen	Cadmium selenide (CdSe) (1306-24-7)

Sicherheit

Kennzeichnung gefährlicher	T,N,Xn,F
R-Sätze:	21-23/25-33-50/53-65-52/53-48/20-38-20/21/22-11-63
S-Sätze:	36/37-45-60-61-28-20/21-62-16
RIDADR	UN 2570 6.1/PG 3
WGK Germany	3
RTECS-Nr.	EV2300000
TSCA	Yes
HazardClass	6.1
PackingGroup	II
HS Code	28429090

Gefahreninformationscode (GHS)

CADMIUM SELENIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R21:Gesundheitsschädlich bei Berührung mit der Haut.
R23/25:Giftig beim Einatmen und Verschlucken.
R33:Gefahr kumulativer Wirkungen.
R50/53:Sehr giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
S-Sätze Betriebsanweisung:
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S60:Dieses Produkt und sein Behälter sind als gefährlicher Abfall zu entsorgen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
Chemische Eigenschaften
3–12mm pieces (sintered), and -325 mesh 10μm or less with 99.999% purity; white to brown; cub or hexagonal crystal(s); hex: a=0.4309nm, c=0.7021 nm, enthalpy of fusion 305.307 kJ/mol; becomes red in sunlight; used as a red pigment, in semiconductors, and as an evaporation material and sputtering target to produce photoconductive films and infrared filters; possible use in the electrofabrication of microdiode arrays [HAW93] [MER06] [CER91] [KLE93] [KRE91]
Physikalische Eigenschaften
The energy gap of the hexagonal CdSe obtained from the absorption measurement Eg (Γ6–Γ1 ) is E_g=1.84 eV, temperature coefficient -4.6×10^-4 eV/K, and pressure coefficient 3.7×10^-6 eV/kg–cm^-2 .
The band structure of cubic CdSe is similar to that of GaAs.
Verwenden
Dispersions with CdS (Aldrich products 208183, 217921) deposited on glass or Si substrates results in tunable red, yellow, or green fluorescent material.
Verwenden
Cadmium selenide is used as a n-type semiconductor and its nanoparticles are used in laser diodes, opto-electronic devices, nanosensing, biomedical imaging and high efficiency solar cells. Since, it is transparent to infrared light, it finds application in photoresistors and windows for instruments utilizing IR light.
Verwenden
In photoconductors, semiconductors, photoelectric cells, and rectifiers; in phosphors.
Vorbereitung Methode
A single crystal can be grown artificially through the vapor phase method or the Stockbarger method.
To obtain evaporated films, the source materials are heated in the alumina crucible with a nichrome heater. Crystal with a larger grain size is obtained at a higher substrate temperature.
The following corrosives are reported:
HNO3 (water cleansing after 2–3 s)
H2SO4 (water cleansing after 5–10 s)
18 N solution of 30 HNO3:0.1 HCl:20 H2SO4 (40℃, 8 s, cleansing with concentrated H2SO4)
3 HCl:1 HNO3
Definition
ChEBI: Cadmium selenide is a cadmium molecular entity.
Application
Cadmium selenide is used as a photoconductive detector for λ: 0.3–0.72 mm (a sharp peak at 0.7 mm) at room temperature. The typical performances are as follows:
Peak detectivity: 2.1×10¹¹ cm Hz^1/2/watt, (λ: 0.7 mm)
Response time: ca. 12 ms
Intermittent frequency: 90 Hz
Dominant noise: current noise
Allgemeine Beschreibung
CdSe crystal can exist in solid hexagonal or cubic structure. CdSe behaves as an n-type semiconductor, with a bandgap of 1.74 eV (300K).1
Flammability and Explosibility
Not classified
Structure and conformation
The space lattice of CdSe (Cadmium selenide) belongs to the two types of crystal system, the cubic system, with the zinc-blend type structure that has a lattice constant of a=0.605 nm, and the hexagonal system, with the wurtzite type structure that has lattice constants of a=0.430 nm and c=0.702 nm.

Cadmiumselenid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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