Refractive index database

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Optical constants of Y2O3 (Yttrium sesquioxide)
Nigara 1968: n 0.25–9.6 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



Y. Nigara. Measurement of the optical constants of yttrium oxide, Jpn. J. Appl. Phys. 7, 404-408 (1968)


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


Yttrium sesquioxide, Y2O3

Yttrium sesquioxide (Y2O3), also known as yttria, is a white crystalline compound that is one of the most stable of the rare earth oxides. With a high melting point and a unique refractive index, yttria is commonly used as a stabilizing agent for zirconia in the production of various ceramic materials, particularly those used for high-temperature applications. Its excellent thermal stability and resistance to chemical attack make it valuable in the production of refractories, crucibles, and ceramic coatings exposed to high temperatures. Additionally, yttrium oxide is used in the manufacture of yttrium-iron garnets (YIGs), which have applications in microwave filters and resonators. The material also serves as a host lattice for phosphors in television tubes and white LEDs.

Other names

  • Yttrium(III) oxide
  • Diyttrium trioxide
  • Yttrium oxide

External links