Yttrium Oxide (Y2O3) Pieces Overview
We sell these pellets and pieces by unit weight for evaporation use in deposition processes. These approximate materials prices are published to provide budgetary guidelines. Actual prices can vary and may be higher or lower, as determined by availability and market fluctuations. To speak to someone directly about current pricing, please click here .
Yttrium Oxide (Y2O3) General Information
Yttrium oxide is a chemical compound with a chemical formula of Y2O3. It is white in color with a melting point of 2,410°C, a density of 5.01 g/cc, and a vapor pressure of 10-4 Torr at ~2,000°C. It is considered to be the most important yttrium compound. Yttrium oxide is used to make phosphors which provide the color red in televisions and yttrium iron garnets are an important element of microwave filters. It is evaporated under vacuum for the fabrication of semiconductors and passive components.
Yttrium Oxide (Y2O3) Specifications
Material Type | Yttrium Oxide |
Symbol | Y2O3 |
Color/Appearance | White, Crystalline Solid |
Melting Point (°C) | 2,410 |
Theoretical Density (g/cc) | 5.01 |
Z Ratio | **1.00 |
E-Beam | Good |
Thermal Evaporation Techniques |
Boat: W Crucible: C |
E-Beam Crucible Liner Material | FABMATE®, Graphite, Tungsten |
Temp. (°C) for Given Vap. Press. (Torr) | 10-4: ~2,000 |
Comments | Loses oxygen; films smooth and clear. |
Suggested QCM Crystal | Alloy Crystal: 750-1002-G10**** |
** The z-ratio is unknown. Therefore, we recommend using 1.00 or an experimentally determined value. Please click here for instructions on how to determine this value.
**** Suggestion based on previous experience but could vary by process. Contact local KJLC Sales Manager for further information
Empirical Determination of Z-Factor
Unfortunately, Z Factor and Shear Modulus are not readily available for many materials. In this case, the Z-Factor can also be determined empirically using the following method:
- Deposit material until Crystal Life is near 50%, or near the end of life, whichever is sooner.
- Place a new substrate adjacent to the used quartz sensor.
- Set QCM Density to the calibrated value; Tooling to 100%
- Zero thickness
- Deposit approximately 1000 to 5000 A of material on the substrate.
- Use a profilometer or interferometer to measure the actual substrate film thickness.
- Adjust the Z Factor of the instrument until the correct thickness reading is shown.
Another alternative is to change crystals frequently and ignore the error. The graph below shows the % Error in Rate/Thickness from using the wrong Z Factor. For a crystal with 90% life, the error is negligible for even large errors in the programmed versus actual Z Factor.
Thermal Evaporation of Yttrium Oxide (Y2O3)
Thermal evaporation is not recommended for depositing yttrium oxide films. The temperatures required to reach a reasonable deposition rate will likely exceed those acceptable in most vacuum chambers. E-beam evaporation is the recommended method to deposit yttrium oxide films.
If thermal evaporation is the only option, we would recommend a thick-gauged, tungsten boat such as our EVS20A015W. Pressure should be monitored to ensure outgassing is at an acceptable level before increasing power. With an evaporation temperature of ~2,400°C, we anticipate a deposition rate of 1-2 angstroms per second. A partial pressure of O2 at 5-8 X 10-5 Torr is recommended. Evaporation temperatures likely exceed the temperatures reasonable to evaporate via resistive heating.
E-beam Evaporation of Yttrium Oxide (Y2O3)
E-beam evaporation is the preferred method to deposit yttrium oxide films. Yttrium oxide can be e-beam evaporated from a graphite, FABMATE®, or tungsten crucible liner.
We recommend sweeping the e-beam at low power and avoid hole drilling. Pressure should be monitored to ensure outgassing is at an acceptable level before increasing the power. With an evaporation temperature of ~2,400°C, we anticipate a deposition rate of 1-2 angstroms per second. A partial pressure of O2 at 5-8 X 10-5 Torr is recommended. Under these parameters, we expect films which are typically amorphous with good adhesion.
Another key process note is to consider the fill volume in the e-beam application because we find that the melt level of a material in the crucible directly affects the success of the crucible liner. Overfilling the crucible will cause the material to spill over and create an electrical short between the liner and the hearth. The outcome is cracking in the crucible. This is the most common cause of crucible liner failure. Placing too little material in the crucible or evaporating too much material before refilling can be detrimental to the process as well. When the melt level is below 30%, the e-beam is likely to strike the bottom or walls of the crucible which immediately results in breakage. Our recommendation is to fill the crucible between 2/3 and 3/4 full to prevent these difficulties.
Crucible liners should be stored in a cool, dry place and always handled with gloves or forceps.
See highlighted results that match your result in the table below.
Ordering Table
Material | Description | Size | Quantity | Purity | Part Number | Price | In Stock | Add To Cart | |
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Material | Description | Size | Quantity | Purity | Part Number | Price | In Stock | Add To Cart | |
Yttrium Oxide |
YTTRIUM OXIDE PIECES, |
2-5mm Pieces | 1kg | 99.99% | EVMYO2-5MMKG | P.O.R. | |||
Yttrium Oxide |
YTTRIUM OXIDE PIECES, |
2-5mm Pieces | 500g | 99.99% | EVMYO2-5MMT | $370.00 |