| Section8 =
Yttrium oxide is Y2O3. It is an air-stable, white substance. Yttrium oxide is used as a common starting material for both materials science as well as inorganic compounds.
In materials science
It is the most important yttrium compound and is widely used to make YVO4 europium and Y2O3 europium phosphors that give the red color In color TV picture tubes. Yttrium oxide is also used to make yttrium-iron-garnetS, which are very effective microwave filters.
In its most important application, Y2O3 is used to make the high temperature superconductor YBa2Cu3O7, known As "1-2-3" to indicate the ratio of the metal constituents:
- 0.5Y2O3 + 2BaO + 3CuO + 0.25O2 → YBa2Cu3O7
This synthesis is typically conducted At 800 °C.
The thermal conductivity of yttrium oxide was measured As 27W/m/K.
In inorganic synthesis
Yttrium oxide is an important starting point for inorganic compounds. For organometallic chemistry it is converted to YCl3
in a reaction with concentrated hydrochloric acid
and ammonium chloride
is a prospective laser material
. In particular, lasers with Ytterbium
allow the efficient operation both in cw
and in pulsed regimes.
At high concentration of excitations (of order of 1%) and poor cooling, the quenching of emisison at laser frequency and avalanche broadband emission takes place.