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| | Cadmium selenide Basic information |
| | Cadmium selenide Chemical Properties |
| Melting point | >1350°C | | Boiling point | 69.00°C | | density | 5.81 g/mL at 25 °C(lit.) | | refractive index | 2.87 (900 nm) | | storage temp. | 2-8°C | | solubility | insoluble in H2O | | form | granular | | color | Brown-red to black | | Specific Gravity | 5.81 | | Water Solubility | Insoluble in water. | | Sensitive | air sensitive, store cold | | Crystal Structure | Hexagonal, Wurtzite (Zincite) Structure - Space Group P 63mc | | Merck | 14,1626 | | Exposure limits | 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 | | Stability: | store cold | | InChI | 1S/Cd.Se | | InChIKey | AQCDIIAORKRFCD-UHFFFAOYSA-N | | SMILES | [Se]=[Cd] | | Knoop Microhardness | 1300, N/mm2 | | CAS DataBase Reference | 1306-24-7(CAS DataBase Reference) | | EPA Substance Registry System | Cadmium selenide (CdSe) (1306-24-7) |
| Hazard Codes | T,N,Xn,F | | Risk Statements | 21-23/25-33-50/53-65-52/53-48/20-38-20/21/22-11-63 | | Safety Statements | 36/37-45-60-61-28-20/21-62-16 | | RIDADR | UN 2570 6.1/PG 3 | | WGK Germany | 3 | | RTECS | EV2300000 | | TSCA | TSCA listed | | HazardClass | 6.1 | | PackingGroup | II | | HS Code | 28429090 | | Storage Class | 6.1C - Combustible acute toxic Cat.3
toxic compounds or compounds which causing chronic effects | | Hazard Classifications | Acute Tox. 3 Inhalation
Acute Tox. 3 Oral
Acute Tox. 4 Dermal
Aquatic Acute 1
Aquatic Chronic 1
STOT RE 2 Oral |
| | Cadmium selenide Usage And Synthesis |
| Description | Cadmium selenide (CdSe) appears as grayish-brown or red crystals, is insoluble in water, highly toxic, and has a melting point of 1350°C. It can be produced by co-heating metallic cadmium with hydrogen selenide and is used in electron emitters, spectral analysis, photoconductors, semiconductors, and photosensitive components.
 | | Chemical Properties | 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] | | Physical properties | The energy gap of the hexagonal CdSe obtained from the absorption measurement Eg (Γ6–Γ1 ) is Eg=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. | | Uses | 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. | | Uses | Dispersions with CdS (Aldrich products 208183, 217921) deposited on glass or Si substrates results in tunable red, yellow, or green fluorescent material. | | Uses | In photoconductors, semiconductors, photoelectric cells, and rectifiers; in phosphors. | | Production Methods | 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 Hz1/2/watt, (λ: 0.7 mm)
Response time: ca. 12 ms
Intermittent frequency: 90 Hz
Dominant noise: current noise | | General Description | 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.
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| | Cadmium selenide Preparation Products And Raw materials |
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