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Encyclopedia > Cadmium sulfide
Cadmium sulfide
Image:Cadmium sulfide.jpg
General
Other names Greenockite
Molecular formula CdS
Molar mass 144.46 g/mol
Appearance yellow-orange solid
CAS number [1306-23-6]
EINECS number 215-147-8
Properties
Density and phase 4.82 g/cm3, solid
Solubility in water Insoluble
Melting point 1750°C at 100 bar
Boiling point 980°C subl.
Structure
Coordination
geometry
 ?
Crystal structure Hexagonal
Thermodynamic data
ΔfH°solid -144 kJ/mol
S°solid 71 J/(K mol)
Safety data
EU classification Toxic
Carc. Cat. 2
Muta. Cat. 3
Repr. Cat. 3
Dangerous for
the environment
R-Phrases R45, R22, R48/23/25
R62, R63, R68, R53
S-Phrases S53, S45, S61
PEL-TWA (OSHA)  ?
IDLH (NIOSH)  ?
Flash point non flammable
RTECS number EV3150000
Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions Cadmium oxide
Cadmium selenide
Other cations Zinc sulfide
Mercury sulfide
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Cadmium sulfide (UK English sulphide), the mineral greenockite, is an hexagonal, yellowish crystal with specific gravity of 4.7 and Mohs hardness of 3.8. Greenockite is a rare cadmium mineral that consists of cadmium sulfide, CdS, in crystalline form. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of an element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... The EINECS number (for European Inventory of Existing Chemical Substances) is a registry number given to each chemical substance commercially available in the European Union between 1 January 1971 and 18 September 1981. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... A substance is soluble in a fluid if it dissolves in the fluid. ... Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change state from a liquid to a gas throughout the bulk of the liquid. ... The coordination geometry of an atom is the geometrical pattern formed by its neighbors in a molecule or a crystal. ... Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A regular hexagon A hexagon (also known as sexagon) is a polygon with six edges and six vertices. ... Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (as amended) is the main source of European Union law concerning chemical safety. ... For a list of biologically injurious substances, including toxins and other materials, as well as their effects, see poison. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... The Permissible Exposure Limit (PEL or OSHA PEL) is a legal limit in the United States for personal exposure to a substance, usually expressed in parts per million (ppm). ... The United States Occupational Safety and Health Administration (OSHA) was created by Congress under the Occupational Safety and Health Act, signed by President Richard M. Nixon on December 29, 1970. ... Immediately Dangerous to Life and Health (IDLH or NIOSH IDLH) is a limit for personal exposure to a substance defined by the United States National Institute for Occupational Safety and Health (NIOSH), normally expressed in parts per million (ppm). ... The National Institute for Occupational Safety and Health (NIOSH) is the United States federal agency responsible for conducting research and making recommendations for the prevention of work-related injury and illness. ... The flash point of a fuel is the lowest temperature at which it can form an ignitable mix with air. ... RTECS, also known as Registry of Toxic Effects of Chemical Substances, is a database of toxicity information compiled from the open scientific literature that is available for charge. ... The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed relative to vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... Mass spectrometry is a technique for separating ions by their mass-to-charge (m/z) ratios. ... An ion is an atom or group of atoms with a net electric charge. ... Cadmium selenide (CdSe) is a solid compound of cadmium and selenium. ... An ion is an atom or group of atoms with a net electric charge. ... Zinc sulfide is a chemical compound with the formula ZnS. Zinc sulfide is a white to yellow colored powder or crystal. ... Mercury Sulfide is a chemical compound composed of the elements Mercury and Sulfur. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... Greenockite is a rare cadmium mineral that consists of cadmium sulfide, CdS, in crystalline form. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ...


Synthetic cadmium pigments based on cadmium sulfide are valued for their good thermal stability in many polymers, for example in engineering plastics. By adding selenium in its formula it´s possible to obtain colors ranging from a greenish yellow to red violet pigment. The weather resistance for this pigment is 8 in full tone, which means that it is a good pigment for UV. About 2/3 to 3/4 of Cadmium produced worldwide is used in the production of Ni-Cd Batteries. ... A polymer is a generic term used to describe a substantially long molecule. ... The term plastics covers a range of synthetic or semi-synthetic organic condensation or polymerization products that can be molded or extruded into objects or films or fibers. ... General Name, Symbol, Number selenium, Se, 34 Chemical series nonmetals Group, Period, Block 16, 4, p Appearance gray, metallic luster Atomic mass 78. ... Note: Ultraviolet is also the name of a 1998 UK television miniseries about vampires. ...


Cadmium sulfide is a direct band gap semiconductor with a band gap of 2.42 eV. It has useful properties for optoelectronics, being used in both photosensitive and photovoltaic devices. A semiconductor is a material with an electrical conductance that is intermediate to those of an insulator and a conductor. ... In solid state physics and related applied fields, the band gap is the energy difference between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. ... An electronvolt (symbol: eV) is the amount of energy gained by a single unbound electron when it falls through an electrostatic potential difference of one volt. ... Optoelectronics is the study and application of electronic devices that interact with light. ... A solar cell, a form of photovoltaic cell, is a device that uses the photoelectric effect to generate electricity from light, thus generating solar power (energy). ...


External links

  • International Chemical Safety Card 0404
  • European Chemicals Bureau

  Results from FactBites:
 
Cadmium - MSN Encarta (369 words)
Almost the entire cadmium output of the United States is obtained as a by-product in the refining of zinc ores, chiefly from Missouri and Montana.
Cadmium may be electrolytically deposited as a coating on metals, chiefly iron or steel, on which it forms a chemically resistant coating.
Cadmium lowers the melting point of metals with which it is alloyed; it is used with lead, tin, and bismuth in the manufacture of fusible metals for automatic sprinkler systems, fire alarms, and electric fuses.
cadmium: Definition and Much More from Answers.com (1921 words)
Cadmium is the middle member of group 12 (zinc, cadmium, and mercury) in the periodic table, and its chemical properties generally are intermediate between zinc and mercury.
Cadmium is bivalent in all its stable compounds, and its ion is colorless.
Consequently, cadmium is produced mainly as a byproduct from mining, smelting, and refining sulfide ores of zinc, and to a lesser degree, lead and copper.
  More results at FactBites »

 
 

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