TCOX: TCS Metal Oxide Solutions Database Revision History

Software release version 2025a (January 2025)

New Elements and Phases

• Two new elements: Barium (Ba) and Lithium (Li) (for a total of 34 elements).
  • Ba is for glass ceramics, cathode, and potential applications in metallurgy. The BaO-containing systems are important for the glass industry, in particular for TV panel glasses and glasses used for nuclear waste disposal.
  • Li is for glass ceramics, metallurgical processes, semiconductor, electrode industry, and lithium from Li-ion battery recycling slags. Note that low temperature phases relevant for cathode or anode battery development are not included in TCOX.
• 138 new phases (744 phases in total).

Added Thermophysical Properties for the New Elements

• For both Ba and Li: Molar volume, viscosity, surface tension, electrical conductivity/resistivity and thermal conductivity/resistivity are included for the new additions.

Added Thermal Conductivity for Ionic Liquids and Electrical Conductivity for the Solids

• Thermal conductivity/resistivity is included for the ionic liquids and solids.
• Electrical conductivity/resistivity is included for the solids. ELCD/ELRS of ionic liquids already included with TCOX13.

New Systems

• 41 new binary systems are assessed: Ba-B, Ba-Ca, Ba-F, Ba-Fe, Ba-Gd, Ba-La, Ba-Li, Ba-Mg, Ba-Mn, Ba-Mo, Ba-Ni, Ba-O, Ba-Ti, Ba-V, Ba-Y, Ba-Yb, Li-Al, Li-Ca, Li-Co, Li-Cr, Li-Cu, Li-F, Li-Fe, Li-Gd, Li-Hf, Li-K, Li-La, Li-Mg, Li-Mn, Li-Mo, Li-N, Li-Na, Li-Nb, Li-Ni, Li-O, Li-S, Li-Ti, Li-V, Li-W, Li-Y, Li-Yb, Li-Zr.
• 49 new ternary systems are assessed: Al-Ba-O, B-Ba-O, Ba-C-O, Ba-Ca-O, Ba-Cr-O, Ba-F-O, Ba-Fe-O, Ba-Gd-O, Ba-Hf-O, Ba-La-O, Ba-Li-O, Ba-Mg-O, Ba-N-O, Ba-Ni-O, Ba-O-P, Ba-O-Si, Ba-O-Ti, Ba-O-Y, Ba-O-Yb, Ba-O-Zr, Al-Li-O, B-Li-O, C-Li-O, Ca-Li-O, Co-Li-O, Cr-Li-O, Cu-Li-O, F-Li-O, Fe-Li-O, Li-Mg-O, Li-Mn-O, Li-N-O, Li-O-P, Li-O-Si, Li-O-Ti, Li-O-Y, Li-O-Zr, Ba-Ca-F, Ba-F-K, Ba-F-Li, Ba-F-Mg, Ba-F-Na, Ba-F-Zr, Ca-F-Li, F-K-Li, F-Li-Mg, F-Li-Na, F-Li-Zr, Al-Li-Mg.
• 48 new quaternary systems are assessed: Al-B-Ba-O, Al-Ba-Ca-O, Al-Ba-Mg-O, Al-Ba-O-Si, Al-Ca-Li-O, Al-Fe-Li-O, Al-Li-Mg-O, Al-Li-Na-O, Al-Li-O-Si, B-Ba-Ca-O, B-Ba-F-O, B-Ba-K-O, B-Ba-Li-O, B-Ba-Na-O, B-Ba-O-Si, B-Li-Na-O, B-Li-O-Si, Ba-C-Li-O, Ba-C-Na-O, Ba-Ca-Fe-O, Ba-Ca-N-O, Ba-Ca-O-P, Ba-Ca-O-Si, Ba-Ca-O-Y, Ba-Cr-F-O, Ba-Fe-O-P, Ba-Fe-O-Si, Ba-K-N-O, Ba-K-O-Si, Ba-Li-N-O, Ba-Li-O-Si, Ba-Mg-O-Si, Ba-Na-O-Si, Ba-O-Si-Ti, Ba-O-Y-Zr, C-F-Li-O, C-K-Li-O, C-Li-N-O, C-Li-Na-O, Ca-Li-N-O, Ca-Li-O-Si, F-K-Li-Na, F-Li-N-O, K-Li-N-O, Li-Mg-N-O, Li-Mg-O-Si, Li-N-Na-O, Li-Na-O-Si.
• 1 new higher order system is assessed: Ba-Ca-Mg-O-Si.

Software release 2024a (December 2023/January 2024)

New Thermophysical Property Added

• Addition of Electrical Conductivity of Ionic Liquid.

One New System Added

• C-Ca

Reassessed Systems

• Al-Fe, Fe-Si
• Al-C-Fe, Al-Fe-Mn, Al-Fe-Nb, Al-Fe-Ni, Al-Fe-P, B-Fe-Si, C-Fe-Si, Co-Fe-Si, Fe-Cr-Si, Fe-Mn-Si, Fe-Ni-Si, Fe-P-Si, and C-Fe-O
• Fe-Cr-Ni-O
• Al₂O₃-CaO, Al₂O₃-CaO-Fe-O, Al₂O₃-CaO-MgO, Al₂O₃-CaO-SiO₂, Al₂O₃-CaO-Y₂O₃, Al₂O₃-CaO-MgO-SiO₂
• Al₂O₃-CrO_x-SiO₂, Al₂O₃-MnO-FeO-SiO₂

Improvements

• Much of the work related to reassessed systems and new systems are those for the Al/Si distribution between steel and slag.
• Fe-Al was reassessed and a different Fe-Si assessment was used. The ternary Fe-Al-Me and Fe-Si-Me systems are all reassessed (where Me = any metal).

Surface Tension Re-assessed

The surface tension of metallic liquid was re-assessed based on the Redlich-Kister-Muggianu (R-K-M) sub-regular solution model.

Software release version: 2023a (December 2022/January 2023)

New Elements and Binary, Ternary, and Higher Order Systems

• Added three new elements: B, Hf, and Yb
• Added Hf: Assessed or added from literature 24 binary, 11 ternary, and 8 higher order systems.
• Added Yb: Assessed or added from literature 24 binary, 10 ternary, and 8 higher order systems.
• Added B: Assessed or added from literature 20 binary, 21 ternary, and 12 higher order systems.

New Assessed Systems

The following systems are assessed:

• Cu-F-O, Cu-K-O, F-Na-O-Si, F-K-O-Si, Ca-F-Fe-O-Si, Ca-F-K-O-Si, Ca-F-Na-O-Si, NaF-SiF₄, Na-Si-F-O, CaCO₃-MgCO₃, CaCO₃-FeCO₃, FeCO₃-MgCO₃, Nb₂O₅-ZrO₂, Al₂O₃-TiO₂-ZrO₂, Gd₂O₃-La₂O₃-ZrO₂, Cr₂O₃-MgO-SiO₂, MnO-SiO₂-TiO₂, TiO₂-Y₂O₃-ZrO₂, CaO-Gd₂O₃-ZrO₂, Al₂O₃-CaO-Gd₂O₃, Al₂O₃-Fe-O-Y₂O₃, Al₂O₃-CaO-SiO₂-Y₂O₃.

Reassessed Systems

The following systems are reassessed:

• Al₂O₃-CaO, Al₂O₃-CaO-SiO₂, Al₂O₃-CaO-FeO_x, Al₂O₃-CaO-MgO Al₂O₃-CaO-Y₂O₃, Al₂O₃-Na₂O-SiO₂, Al₂O₃-CaO-FeO_x-SiO₂, Al₂O₃-CaO-MgO-SiO₂, Al₂O₃-CaO-Na₂O-SiO₂, Cu-F, Ca-F-Mn, Al-O-V, Fe-Na-O, Al₂O₃-SiO₂-TiO₂.

• Reassessed ZrO₂-mono/tetra T0 for ZrO₂-Al₂O₃, ZrO₂-Gd₂O₃, ZrO₂-Y₂O₃.

Other Changes

• Extended the GARNET phase description.
• Included complete gas description.

Software release version: 2022a (December 2021/January 2022)

• Fixed an error in molar volume of FCC_A1 and BCC_A2 phases.

Software release version: 2021b (June 2021)

New Element

• Addition of K

Binary, Ternary and Higher Order System Updates

• K: Assessed or added from literature 24 binary, 13 ternary and 14 higher order systems.
• Added carbide and nitride phases.
• The following systems have been assessed: Al₂O₃-CaO-MgO.
• The following systems have been reassessed: Al₂O₃-CaO-MgO-SiO₂.
• Reassessed Fe-solubility in MgSiO₃ (ortho-pyroxene).
• Updated all metallic systems to be the same as in the TCFE database.

Thermophysical Properties

• Addition of surface tension of the ionic liquid phase.
• Addition of viscosity of the ionic liquid phase for the systems containing K.

Software release version: 2021a (December 2020/January 2021)

Thermophysical Properties

• Added viscosity for the liquid oxides of MoO₂, MoO₃, NbO, Nb₂O₅ and Y₂O₃.
• Replaced the molar volumes of metallic liquid with the unified molar volumes, which is now consistent with all the other databases.
• Added molar volumes for both liquid and solid phases which had missing values in the previous version.

Binary, Ternary, and Higher Order Systems

• N: Added NO₃^-1 to the liquid phase.

• Fixed a bug in NiO that made the function not continuous at T=1800 K. These systems are reassessed due to the change in NiO description: Ca-Ni-O, Gd-Ni-O, La-Ni-O, Nb-Ni-O, Ni-O-P, Ni-O-Si, Ni-O-Ti, Ni-O-V, Ni-O-Y, CaO-NiO-SiO₂, MgO-NiO-SiO₂, Co-La-Ni-O.
• Updated NbO₂ to the latest description.
• Decreased stability of FeSiO₃ ortho-pyroxene (should not be stable, but was in version 10.0).
• The following systems are assessed: AlF₃-NaF, Ca(NO₃)₂, Mg(NO₃)₂, MgF₂-NaF, NaNO₃, NaF-Na₂CO₃, NaNO₃-Na₂CO₃, Na₂CO₃-Na₂S, Ca(NO₃)₂-Mg(NO₃)₂, Ca(NO₃)₂-NaNO₃, NaNO₃-NaF, Mg(NO₃)₂-NaNO₃. Estimations: Al₂O₃-Na₂O-ZrO₂, Na₂O-SiO₂-ZrO₂.
• The following systems have been reassessed: Updated liquid AlF3 to [2013 Lambotte]. AlF₃-CaF₂, AlF₃-MgF₂. Reassessed solubility of Al in V3O5_HT and M4O7. Reassessed solubility of Mg in V3O5_HT.
• Assessed a separation between liquid NaF and oxides in the following NaF-MeO_x systems: MeO_x= CuO, FeO_3/2, MnO_3/2, NbO_5/2, SiO₂.

Software release version: 2020b (June 2020)

New Thermophysical Properties

• Added/assessed molar volumes to the database, both for solid and liquid oxides and metals.
• Assessed viscosity for the liquid oxides. Included oxides: FeO, Fe₂O₃, CaO, MgO, Al₂O₃, SiO₂, CaF₂, Cr₂O₃, Na₂O, MnO, TiO₂, ZrO₂, P₂O₅, Gd₂O₃, La₂O₃, V₂O₅, NiO, CuO_x.

New Elements

• Addition of three new elements: N, Na, H (Hydrogen only in gas).

Binary, Ternary and Higher Order System Updates

• N: Added description of 17 binary and 28 ternary systems. Nitrogen is only assessed in metallic systems, so for example SiAlONs are not described in this database.
• Na: Assessed or added from literature eight binary metallic systems. Added Na-O from literature and assessed the Na-S system. Assessed eight ternary Me-Na-O and 11 higher order oxide systems.
• The following systems have been assessed: C-Ca-O and C-Mg-O.
• The following systems have been reassessed: Cr-O, Ca-Cr-O, Cr-Si-O, Ca-Cr-Si-O.
• Minor changes to the following systems: Co-Ni-O, Co-Fe-Ni-O, Co-Fe-Ti-O, Mo-O, Al-Mo-O, Mg-Mo-O, Mn-Mo-O, Mo-Ni-O, Nb-O, La-P-O, P-Zr-O, Ti-Zr-O.
• Assessed a separation between liquid metal and SiO₂ in the following Me-O-Si systems: Me = Ca, Gd, La, Mg, Mo, Nb, Ni, P, Ti, V, W, Y, Zr.

Other Updates and Improvements

• H: Added H, H₂, C₁H₄ and H₂O to the gas phase.
• Reassessed the vacancy fraction on the FCC metallic sublattice to get a Va-fraction of 1e-5 at liquidus (this was earlier 1e-4).

Software release version: 2019b (June 2019)

• Addition of Ti: Assessed or added from literature all binary and a few ternary metallic systems. Assessed Ti-O and Ti-S binary systems. Assessed 19 ternary Me-Ti-O, two Me-Ti-S and 23 higher order oxide systems as indicated in the TCOX information sheet. Ti+2/+3/+4 is included in the liquid oxide, so the correct distribution of oxidation states in the slag can be calculated.
• The following systems have been assessed for version 9: CaO-SiO₂-VO_x. The correct distribution of oxidation states in the slag (+3/+4/+5) can now be calculated.
• The following systems have been reassessed for version 9: Ca-O-V, Mg-O-V, O-Si-V, and CaO-SiO₂-Y₂O₃.
• The following systems have been estimated for version 9: MgO-SiO₂-VO_x, MnS-NbS, MnS-VS.
• Changed model for VO solid solution, from Halite to FCC_A1 to be consistent with cubic TiO. Reassessed solubility of V₂O₃ in CaO/CoO/FeO/MgO/MnO/NiO Halite due to change of model for VO. Assessed C-V-O, modeling complete solid solution between VC_x and VO_y (same applies to the C-Ti-O system).
• Merged CoV₂O₆ and NiV₂O₆ compounds to the CaV₂O₆ phase.
• Removed the SO₄^-2 species in the liquid phase.
• Minor changes to the following systems: W-O, Al-Cr-O, Ca-Ni-O, Co-O-V, Cr-Cu-O, Mg-Mn-O, Co-Mn-O, Co-Mo-O, Co-O-P, Nb-O-P, Ni-O-Si, Ni-O-V, Al-Ca-Ni-O, Al-Ni-O-Y, Ca-Co-Cu-O, Ca-Co-Ni-O, Co-Mn-O-Y, Fe-La-Ni-O, Gd-Mn-O-Si.

Software release version: 2018b (June 2018)

• Addition of 6 new elements: Co, Mo, P, V, W, Ar (only in gas).
• Co: Assessed or added from literature all binary and a few ternary metallic systems. Added/Assessed Co-F, Co-O and Co-S. Assessed 29 ternary Co-Me₂-O, Co-Me₂-S and Co-Me₂-F systems and 13 higher order oxide systems as indicated in the TCOX information sheet.
• Mo: Assessed or added from literature all binary and a few ternary metallic systems. Added/Assessed Mo-O and Mo-S. Assessed 6 ternary Me1-Mo-O and Me1-Mo-S systems as indicated in the TCOX information sheet.
• P: Assessed or added from literature all binary and a few ternary metallic systems except F-P, Gd-P, La-P, Mg-P, P-V, P-W and P-Zr. Assessed 18 ternary Me1-O-P systems and 11 higher order oxide and oxy-fluoride systems as indicated in the TCOX information sheet.
• V: Assessed or added from literature all binary and a few ternary metallic systems except P-V. Assessed 13 ternary Me1-V-O systems as indicated in the TCOX information sheet.
• W: Assessed or added from literature all binary and a few ternary metallic systems except Ca-W, F-W and P-W. Assessed 13 ternary Me1-W-O systems as indicated in the TCOX information sheet.
• The following systems have been assessed for version 8: CaF₂-CoF₂/CrF₃/MnF₂, CoF₂-GdF₃/MgF₂/NiF₂, FeF₃-NiF₂, GdF₃-YF₃, LaF₃-ZrF₄, Al-Cu-S, Al-La-S, Ca-Y-S, Al-Ni-S and Cr-Ni-S.
• The following systems have been reassessed for version 8: F-Fe, Mg-Ni-O-Si, CaO-NiO-SiO₂, Mn-Ni-O, Al-Ni-O, Mn-Si-O, Al-Mn-Si-O, Al-Fe-Mn-Si-O, Ca-Mn-Si-O, Ni-Si-O, Ca-Ni-Si-O, Mg-Ni-Si-O, Al-Cu-O, Al-Cu-Si-O.
• The following systems have been estimated for version 8: La-Mg-S, Mn-Zr-S, Gd-Mg-S, Fe-Zr-S, Fe-Gd-S, Fe-La-S, Cu-La-S, Cu-Si-S, Nb-S, Fe-Nb-S
• The large complex gaseous phase has been removed. A reduced gaseous mixture is used including only the important species. If a complete gas is needed, it should be appended from the SGTE substance database.
• α-Ca₂SiO₄ and α'-Ca₃P₂O₈ is merged into one phase. Reassessed solubility of Fe, Gd, Mg, Mn and Y due to change of models.
• Removed Ni-solubility in Corundum.

Software release version: 2017a (March 2017).

• Addition of 6 new elements: Cu, F, S, Gd, La and Nb.
• Cu: Added all binary and a few ternary metallic systems. Added Cu-O and Cu-S. Assessed Al₂O₃-Cu-O, CaO-Cu-O, Cu-Cr-O, Cu-Fe-O, Cu-O-La₂O₃, Cu-O-MgO, Cu-Mn-O, Cu-Nb-O, Cu-Ni-O, Cu-Si-O, Cu-Y-O, Al₂O₃-Cu-O-SiO₂, CaO-Cu-Fe-O, CaO-Cu-O-SiO₂, Cu-Fe-O-SiO₂, Cu-O-MgO-SiO₂, Cu-Cr-S, Cu-Fe-S, Cu-Mg-S, Cu-Mn-S, Cu-Ni-S, Cu-O-S, Cu-Fe-O-S.
• F: Added liquid and solid AlF₃, CaF₂, CrF₂, CrF₃, CuF, CuF₂, FeF₂, FeF₃, GdF₃, LaF₃, MgF₂, MnF₂, NbF₂, NbF₅, NiF₂, SiF₄, YF₃, ZrF₄. Assessed Ca-CaF₂, CaF₂-CaO, GdF₃-Gd₂O₃, MgF₂-MgO, AlF₃-CaF₂, AlF₃-MgF₂, AlF₃-ZrF₄, CaF₂-FeF₂, CaF₂-GdF₃, CaF₂-LaF₃, CaF₂-MgF₂, MgF₂-GdF₃, MgF₂-LaF₃, MgF₂-YF₃, AlF₃-Al₂O₃-CaF₂-CaO, CaF₂-CaO-MgF₂-MgO, CaF₂-Cr₂O₃, CaF₂-CaO-FeO-Fe₂O₃-FeF₂, CaF₂-SiO₂-CaO-SiF₄, Al₂O₃-CaF₂-MgO, Al₂O₃-CaF₂-SiO₂, MgF₂-MgO-SiO₂. Estimated CaF₂-CaS, CaF₂-CaSO₄, AlF₃-SiO₂.
• S: Assessed or added from literature: Al-S, Ca-S, Cr-S, Cu-S, Fe-S, Mg-S, Mn-S, Ni-S, Si-S, Y-S, Al-Fe-S, Ca-Fe-S, Ca-Mg-S, Ca-Mn-S, Cr-Fe-S, Cu-Cr-S, Cu-Fe-S, Cu-Mg-S, Cu-Mn-S, Cu-Ni-S, Fe-Mg-S, Fe-Mn-S, Fe-Ni-S, Mg-Mn-S, Al-O-S, Ca-O-S, Cu-O-S, Fe-O-S, Mg-O-S, Mn-O-S, Si-O-S, CuS-SiO₂, FeS-SiO₂, MnS-SiO₂, Al₂O₃-CaO-CaS, Al₂O₃-MgO-MgS, Al₂O₃-MnO-MnS, CaO-SiO₂-CaS, MgS-SiO₂, Al₂O₃-CaO-CaS-MnO-MnS, Cu-Fe-O-S, CaF₂-CaS. Estimated Gd-S, La-S, CaF₂-CaS, CaF₂-CaSO₄.
• Gd: Added all binary metallic systems except Gd-La. Added Gd-O and estimated Gd-S. Assessed Al₂O₃-Gd₂O₃, CaO-Gd₂O₃, Cr₂O₃-Gd₂O₃, Fe₂O₃-Gd₂O₃, Gd₂O₃-MgO, Gd₂O₃-NiO, Gd₂O₃-SiO₂, Gd₂O₃-ZrO₂, Al₂O₃-Gd₂O₃-ZrO₂, CaO-Gd₂O₃-SiO₂, Gd₂O₃-SiO₂-ZrO₂.
• La: Added all binary metallic systems except Gd-La, La-Nb and La-Si. Added La-O and estimated La-S. Assessed Al₂O₃-La₂O₃, CaO-La₂O₃, Cr₂O₃-La₂O₃, Cu-O-La₂O₃, Fe-O-La₂O₃, La₂O₃-Mn-O, La₂O₃-Nb₂O₅, La₂O₃-NiO, La₂O₃-SiO₂, La₂O₃-ZrO₂, Al₂O₃-La₂O₃-Y₂O₃, Al₂O₃-La₂O₃-ZrO₂.
• Nb: Added all binary metallic systems except La-Nb. Assessed Nb-O. Assessed Al₂O₃-Nb₂O₅, CaO-Nb₂O₅, Cr₂O₃-Nb₂O₅, CuO-Nb₂O₅, Fe-Nb-O, La₂O₃-Nb₂O₅, MgO-Nb₂O₅, MnO-Nb₂O₅, Nb₂O₅-NiO, Nb₂O₅-SiO₂, CaO-Nb₂O₅-SiO₂.
• The following systems have been assessed for version 7: Al₂O₃-CaO-Cr₂O₃, SiO₂-Fe-Mn-O, CaO-FeO-MnO, Al₂O₃-Fe-Mn-O, SiO₂-Al₂O₃-Fe-Mn-O.
• The following systems have been estimated for version 7: CaO-Mn-O-Y₂O₃, Fe-O-NiO-SiO₂.
• Added assessment of Mg-Mn-O and Cr₂O₃-MgO-SiO₂ from literature.
• The following systems have been reassessed for version 7: CaO-SiO₂-ZrO₂, CaO-SiO₂-Y₂O₃, Al₂O₃-CaO-SiO₂-Y₂O₃.
• modeled Fe₂O₃ solubility in MULLITE.
• modeled ZrO₂ solubility in APATITE.
• modeled Y₂O₃ solubility in ZIRCON.
• Merging CF (CaO.Fe₂O₃), α-CACR₂O₄ and CAY₂O₄ to one phase: CAV2O4.

Software release version: 2015a (June 2015)

The following systems have been assessed for version 6: Al-Ca-Fe-Si-O, Al-Ca-Mg-Zr-O, Al-Ca-Y-O, Al-Fe-Mg-O, Al-Mg-Y-O, Al-Mn-Si-O, Al-Si-Zr-O, Ca-Fe-Mg-O, Ca-Fe-Mg-Si-O, Ca-Mg-Zr-O, Ca-Si-Y-O, Ca-Si-Zr-O, Ca-Y-Zr-O, Fe-Mg-Si-O, Mg-Si-Y-O and Mg-Y-Zr-O.

• Added assessments of Mg-Y and Mg-Zr from literature.
• The following systems have been reassessed for version 6: Al-Ca-Zr-O, Al-Cr-Zr-O, Al-Mg-Zr-O, Al-Ni-O, Al-Zr-O, Fe-Mg-O, Fe-Mg-Si-O, Fe-Y-O, Fe-Zr-O, Mn-Si-O and Ni-Si-O.
• The following systems have been estimated for version 6: Al-Ca-Si-Y-O, C-Ca, C-Mg, Ca-Cr, Ca-Mn, Ca-Y, Ca-Mg-Mn-O, Ca-Ni-Si-O, Mg-Ni-Si-O and Mg-Si-Zr-O.
• Added interaction for Ca-Fe in HCP identical to FCC and BCC. This makes the HCP phase not stable in the binary phase diagram. Reassessed liquid phase.
• Modified Al-Fe-O CORUNDUM.
• modeled CaO solubility in ORTHO_PYROXENE.
• Estimation of Al-Fe-Mn-O to fit a Mn/Si steel in Fe-Al-Mn-Si-O.
• Added a parameter in liquid Al-Si-O to get rid of a miscibility gap at high SiO₂ in Al-Mn-Si-O in equilibrium with Mn.
• Added Ca₂FeSi₂O₇ (MELILITE) and estimated the “binaries” Ca₂FeSi₂O₇-Ca₂MgSi₂O₇ and Ca₂FeSi₂O₇-Ca₂AlFeSiO₇.
• Merged YAM and CUSPIDINE phases to get complete solubility between Y4Al2O9 and Ca2Si2Y2O9.
• Corrected a misprint in liquid Al-Ca-Zr-O, so the miscibility gap was removed.
• Changed back to the old description for ANORTHITE.

TCOX5 released in October 2012 and TCOX5.1 released in January 2013.

• Included Y₂O₃ and ZrO₂. Also added available descriptions for Y-O and Zr-O from literature, with small modifications due to model compatibility with TCOX. Many binary and ternary systems with these two new components are assessed for TCOX5.
• Al₂O₃-CaO-Fe-O, Al₂O₃-CaO-MnO, Al₂O₃-Fe-O-SiO₂, CaO-Cr-O-SiO₂, CaO-MnO-SiO₂, MgO-Al₂O₃-CrO-Cr₂O₃, FeO-Fe₂O₃-MgO-SiO₂ have been added from published assessments or assessed for TCOX5.
• Merged phases Mn₂O₃ and cubic Y₂O₃ to one single phase: M2O3C.
• Removed all intermetallic phases and carbides. Updated metallic liquid, fcc, bcc etc. to the latest available descriptions.
• Changed model for oxygen in DIAMOND_FCC_A4. Oxygen is now modeled as an interstitial element, instead of using a substitutional model as before. This change was done due to computational problems with the DIAMOND_FCC_A4 phase when Si was not defined in the system.
• Modification of the ANORTHITE phase stability in the Al₂O₃-CaO-MgO-SiO₂ system.
• Simplified the model for the ALPHA_SPINEL phase due to computational problems.
• Reassessed Al-Cr-O and Cr-O due to an unwanted miscibility gap in the Al₂O₃-Cr₂O₃ system close to Cr-O.
• Removed charged species from the gas phase.
• Al₂O₃-CaO-NiO, Al₂O₃-NiO, CaO-Cr-O, CaO-Mn-O, Cr-O-MgO, Cr-O-SiO₂ and MgO-NiO are reassessed.
• Added Ca to the SPINEL phase. Solubility of Ca in Fe₃O₄ and Mn₃O₄ has been assessed.
• Added ASSESSED_SYSTEMS. It is now possible to calculate the Me-O binaries using the BINARY module in Thermo‑Calc.