Material Use Guide for YTTRIUM OXIDE

BASIC PROPERTIES OF YTTRIUM OXIDE
(for pure material/fully dense; may differ from coating)

Formula weight, Y₂O₃...................................................................................... 225.84
Density (Theoretical)..............................................................,.................. 5.03 g/cm^₃
Crystal Structure................................................................................................... BCC
Color..................................................................................................................... White
Emissivity (at 1300 K)..............................................................................................0.3
Electrical Resistivity (at 298 K)...........................................,............... >10⁸ ohm-cm
Knoop Microhardness (kg/mm²@100g.-load)
  (at 298 K) ........................................................................................................... 700
  (at 1273 K).......................................................................................................... 200
Thermal Expansion............................................................. 8.2 x10^-6/C; 25-1000 C
Specific Heat (at 298 K) .......................................................................0.109 cal/g K
Thermal Conductivity
 (a 373 K)............................................................................. 0.034 cal / (cm-sec-K)
 (at 1673 K).......................................................................... 0.007 cal / (cm-sec-K)
Use Temperatures ................................................................ 2000 C Inert/Vacuum
                 1500 C Reducing/Vacuum with Carbon
                          >2000 C Oxidizing*
            [*note some coatings are not for air/oxidizing use]
Melting Point.................................................................................................... 2415 C

COMPATIBILITY DATA

Reportedly Stable at High Temperatures
(Minimum Interaction)

U, Ti (reacts slightly), Be, V, Cr, Zr, Hf, Ni, Specialty Steels, Copper Alloys, Most Molten Metals, Glasses, Slags, and Salts
 

Reacts at High Temperatures
(Unstable)

Acidic materials, CuO, C (>1500 C, vacuum)

Data for the pure materials. Performance of the coatings may differ. Given for general information only; some interaction may occur at certain temperature and environmental conditions; it is advised that investigators evaluate their specific systems based on a thorough search of the literature. Many materials may be compatible/stable but were not known to us -- this list should not be considered exaustive.