Cadmium sulfide Chemical Properties
- Melting point:
- 980°C (subl.)
- Boiling point:
- 980°C (estimate)
- 4.82 g/mL at 25 °C(lit.)
- Flash point:
- storage temp.
- Soluble in acid, very slightly soluble in ammonium hydroxide.
- Yellow to orange
- Specific Gravity
- Water Solubility
- Solubility Product Constant (Ksp)
- pKsp: 26.1
- CAS DataBase Reference
- 1306-23-6(CAS DataBase Reference)
- EPA Substance Registry System
- Cadmium sulfide (1306-23-6)
- Hazard Codes
- Risk Statements
- Safety Statements
- UN 3077 9/PG 3
- WGK Germany
- Hazardous Substances Data
- 1306-23-6(Hazardous Substances Data)
Cadmium sulfide Usage And Synthesis
yellow to orange crystalline powder
Cadmium sulfide is an odorless, crystalline, lemon yellow to orange solid.
Yellow to orange crystal; occurs as two polymorphs, hexagonal alpha form and cubic beta form; exhibits stable wurtzite structure at lower temperature, and zinc blende type structure at higher temperatures; the beta form converts to alpha form when heated at 750°C in sulfur atmosphere; sublimes at 980°C; practically insoluble in water (1.3 mg/L at 20°C); Ksp 3.6x10-29; dissolves in dilute mineral acids on heating or concentrated acids at ordinary temperatures (decomposes with liberation of H2S).
Cadmium sulfide occurs in nature as the mineral greenoktite. The compound is widely used in pigments for paints, baking enamels, ceramics and plastics. It imparts bright yellow to maroon, with strong retention of color and resistance to alkalis. It also is used in inks, phosphors, and fluorescent screens. Other applications of this compound are in photovoltaic and solar cells (for converting solar energy to electrical energy), photoconductors (in xerography), thin film transistors and diodes, rectifiers, scintillation counters, pyrotechnics, and smoke detectors.
cadmium sulfide is used as a colorant for paints and rubber; cadmium acetate is used in the production of craftware.
Used in the production of solar cells where it is used as a buffer layer in the manufacture of CIGS (Copper -Indium-Gallium-Selenide) solar cells
As a pigment being fast to light and not affected by H2S; color for soaps; coloring glass yellow; coloring textiles, paper, rubber; in printing inks, ceramic glazes, fireworks; in phosphors and fluorescent screens; in scintillation counters, semiconductors, photoconductors.
A native cadmium sulfide containing 77.7% cadmium. Ore of cadmium
Greenockite: a mineral form ofcadmium sulphide, CdS.
Cadmium sulfide may be prepared by the reaction between hydrogen sulfide and cadmiumvapor at 800 Cor by heating a mixture of cadmium or cadmium oxide with sulfur.
Cadmium sulfide may be prepared by precipitation from an aqueous solution of its soluble salts such as cadmium chloride or cadmium nitrate by passing hydrogen sulfide. The reactions may be carried out in acidic, neutral or alkaline solutions using various cadmium salts to obtain different crystal modifications as shown in the table below.
Cadmium sulfide also may be obtained by treatment of sodium or other alkali metal sulfide solution with that of a soluble cadmium salt. The compound also may be prepared by heating a mixture of cadmium or its oxide with sulfur at 800°C; or by the reaction of H2S with cadmium vapor at 800°C.
A confirmed carcinogen, highly toxic. See cadmium.
Confirmed human carcinogen with experimental carcinogenic and tumorigenic data. Moderately toxic by ingestion and inhalation. Human mutation data reported. When heated to decomposition it emits very toxic fumes of Cd and SOx. See also CADMIUM COMPOUNDS and SULFIDES
Used in pigments; as an active ingredient in dandruff shampoos; making photoconductors, solar cells, and other electronic components.
UN2570 Cadmium compounds, Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required.
Contact with water or moisture releases poisonous hydrogen sulfide gas. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause
Use a licensed professional waste disposal service to dispose of this material. All federal, state, and local environmental regulations must be observed. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposa
- Cadmium sulfide (CdS), copper and lead-doped
- Cadmium sulfide (CdS), solid soln. with zinc sulfide, aluminum and silver-doped
- Cadmium sulfide (CdS), solid soln. with zinc sulfide, silver chloride-doped
- Cadmium selenide (CdSe), solid soln. with cadmium sulfide, zinc selenide and zinc sulfide, aluminum and copper-doped
- Cadmium sulfide (CdS), solid soln. with zinc sulfide, aluminum and copper-doped
- Cadmium sulfide (CdS), solid soln. with zinc sulfide, copper and nickel-doped
- cadmium red
- Cadmium sulfide (CdS), solid soln. with zinc sulfide, nickel and silver-doped
- Cadmium sulfide (CdS), solid soln. with zinc sulfide, copper and manganese-doped
- Cadmium selenide (CdSe), solid soln. with cadmium sulfide, zinc selenide and zinc sulfide, gold and manganese-doped
- Cadmium selenide (CdSe), solid soln. with cadmium sulfide
- ZINC CADMIUM SULFIDE,ZINC CADMIUM SULFIDE FLUORESCENT
- CADMIUM SULFOSELENIDE
- Cadmium sulfide
- Hydrogen Sulfide
- Dimethyl sulfide
- CARBONYL SULFIDE
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