Indium antimonide
Indium antimonide (InSb) is a crystalline compound made from the elements indium (In) and antimony (Sb). It is a narrow-gap semiconductor material from the III-V group used in infrared detectors, including thermal imaging cameras, FLIR systems, infrared homing missile guidance systems, and in infrared astronomy. Indium antimonide detectors are sensitive to infrared wavelengths between 1 and 5 μm.
| Identifiers | |
|---|---|
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.013.812 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 1549 |
CompTox Dashboard (EPA) |
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| Properties | |
| InSb | |
| Molar mass | 236.578 g·mol−1 |
| Appearance | Dark grey, metallic crystals |
| Density | 5.7747 g⋅cm−3 |
| Melting point | 524 °C (975 °F; 797 K) |
| Band gap | 0.17 eV |
| Electron mobility | 7.7 mC⋅s⋅g−1 (at 27 °C) |
| Thermal conductivity | 180 mW⋅K−1⋅cm−1 (at 27 °C) |
Refractive index (nD) |
4 |
| Structure | |
| Zincblende | |
| T2d-F-43m | |
a = 0.648 nm | |
| Tetrahedral | |
| Thermochemistry | |
Heat capacity (C) |
49.5 J·K−1·mol−1 |
Std molar entropy (S⦵298) |
86.2 J·K−1·mol−1 |
Std enthalpy of formation (ΔfH⦵298) |
−30.5 kJ·mol−1 |
Gibbs free energy (ΔfG⦵) |
−25.5 kJ·mol−1 |
| Hazards | |
| GHS labelling: | |
| Warning | |
| H302, H332, H411 | |
| P273 | |
| Safety data sheet (SDS) | External SDS |
| Related compounds | |
Other anions |
Indium nitride Indium phosphide Indium arsenide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Indium antimonide was a very common detector in the old, single-detector mechanically scanned thermal imaging systems. Another application is as a terahertz radiation source as it is a strong photo-Dember emitter.
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