"ALON" redirects here. For the aircraft corporation, see Alon (disambiguation).
Aluminium oxynitride
Spinel structure of ALON
Names
Systematic IUPAC name
Aluminium oxynitride
Identifiers
CAS Number
12633-97-5Y
Abbreviations
ALON
Properties
Chemical formula
(AlN)x·(Al2O3)1−x, 0.30 ≤ x ≤ 0.37
Appearance
White or transparent solid
Density
3.691–3.696 g/cm3[1]
Melting point
~2150 °C[1]
Solubility in water
insoluble
Refractive index (nD)
1.79[2]
Structure
Crystal structure
cubic spinel
Lattice constant
a = 794.6 pm[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound
Aluminium oxynitride (marketed under the name ALON by Surmet Corporation[3]) is a transparent ceramic composed of aluminium, oxygen and nitrogen. Aluminium oxynitride is optically transparent (≥ 80%) in the near-ultraviolet, visible, and mid-wave-infrared regions of the electromagnetic spectrum. It is four times as hard as fused silica glass, 85% as hard as sapphire, and nearly 115% as hard as magnesium aluminate spinel. It can be fabricated into transparent windows, plates, domes, rods, tubes, and other forms using conventional ceramic powder processing techniques.[citation needed]
Aluminium oxynitride is the hardest polycrystalline transparent ceramic available commercially.[2] Because of its relatively low weight, distinctive optical and mechanical properties, and resistance to oxidation or radiation, it shows promise for applications such as bulletproof, blast-resistant, and optoelectronic windows.[4] Aluminium oxynitride-based armor has been shown to stop multiple armor-piercing projectiles of up to .50 BMG.[5]
^ ab"ALON Optical Ceramic. Technical data" (PDF). Surmet Corporation. 2003. Archived from the original (PDF) on 2013-06-12. Retrieved 2009-01-09.
^ abcMohan Ramisetty et al. Transparent Polycrystalline Spinels Protect and Defend, American Ceramic Society Bulletin, vol.92, 2, 20–24 (2013)
^4520116, Richard L. Gentilman, Edward A. Maguire, Leonard E. Dolhert, "Transparent aluminum oxynitride and method of manufacture", published May 28, 1985, assigned to Surmet Corp
^"Domes & Infrared Optics". Surmet.
^Ramisetty, Mohan; Sastri, Suri A.; Goldman, Lee (Aug 2013). "Transparent Ceramics Find Wide Use in Optics". Photonics Spectra.
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