Refractive index database

nk database   |   n2 database   |   about




Optical constants of MgAl2O4 (Magnesium aluminate, spinel)
Tropf and Thomas 1991: n 0.35–5.5 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



Room temperature


1) W. J. Tropf and M. E. Thomas, Magnesium aluminum spinel (MgAlO4), in E. D. Palik (ed.), Handbook of Optical Constants of Solids II, Academic Press, Orlando, 1991, pp. 881-895
2) Handbook of Optics, 3rd edition, Vol. 4. McGraw-Hill 2009
* Ref. 2 provides improved Sellmeier equation based on data from Ref. 1


[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]


Magnesium aluminium oxide, MgAl2O4

Magnesium aluminium oxide, commonly known as spinel (MgAl2O4), is a transparent ceramic material with a cubic crystal structure. Spinel possesses excellent optical transparency from the ultraviolet to the mid-infrared range, making it valuable for various optical applications. This material is notably durable, resistant to attack from harsh environments, and can withstand high temperatures. These characteristics make it ideal for protective windows in specific high-stress applications. Moreover, due to its favorable mechanical properties and refractive index, spinel is being considered for anti-reflective coatings and other advanced optical devices. Additionally, its non-birefringent nature is a plus in certain optical scenarios.

Other name

  • Magnesium aluminum oxide


  • Spinel

External links