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Cadmium selenide

CAS number : 1306-24-7

Molecular weight :191.37

Molecular formula/chemical symbol :CdSe

Description :

Three crystalline forms of CdSe are known: wurtzite (hexagonal), sphalerite (cubic) and rock-salt (cubic). The sphalerite CdSe structure is unstable and converts to the wurtzite form upon moderate heating. The transition starts at about 130 °C, and at 700 °C it completes within a day. The rock-salt structure is only observed under high pressure.

Cadmium selenide

IUPAC name[hide]

Selanylidenecadmium[1]

Other names[hide]

Cadmium(2+) selenide[2]

Cadmium(II) selenide[2]

Cadmium selenide[citation needed]

Identifiers

CAS number

1306-24-7 YesY

PubChem

14784

ChemSpider

14101 YesY

EC number

215-148-3

UN number

2570

MeSH

cadmium+selenide

ChEBI

CHEBI:50834 YesY

RTECS number

EV2300000

Gmelin Reference

13656

Jmol-3D images

Image 1

SMILES

[hide]

·                                 [Se]=[Cd]

InChI

[hide]

·                                 InChI=1S/Cd.Se YesY
Key: AQCDIIAORKRFCD-UHFFFAOYSA-N YesY


InChI=1/Cd.Se/rCdSe/c1-2
Key: AQCDIIAORKRFCD-BBSQRNTLAE

Properties

Molecular formula

CdSe

Molar mass

191.37 g mol?1

Appearance

Black, translucent, adamantine crystals

Odor

Odorless

Density

5.816 g cm-3

Melting point

1268 °C, 1541 K, 2314 °F

Band gap

1.74 eV

Refractive index (nD)

2.5

Structure

Crystal structure

Wurtzite

Space group

C6v4-P63mc

Coordination
geometry

Tetrahedral

Hazards

GHS pictograms

The skull-and-crossbones pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)The health hazard pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)The environment pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)

GHS signal word

DANGER

GHS hazard statements

H301, H312, H331, H373, H410

GHS precautionary statements

P261, P273, P280, P301+310, P311, P501

EU Index

048-001-00-5

EU classification

ToxicT Dangerous for the Environment (Nature)N

R-phrases

R20/21/22, R23/25, R33, R50/53

S-phrases

(S2), S36/37, S45, S60, S61

Related compounds

Other anions

Cadmium oxide,
Cadmium sulfide,
Cadmium telluride

Other cations

Zinc selenide,
Mercury(II) selenide

 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa

 

USES :

Electron emitters and spectroscopy, optical conductors, semiconductors, photosensitive member.

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