Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C
The phase equilibria in the ZrO2–HfO2–Nd2O3 ternary system at 1500 °C and 1700 °C were studied over the whole concentration range by X-ray diffraction and microstructural analyses. Corresponding isothermal sections were constructed from the data obtained. It was found that solid solutions in this sy...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Open Ceramics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666539523000937 |
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| author | Yu.V. Yurchenko O.A. Korniienko O.I. Bykov A.V. Samelyuk S.V. Yushkevych M.V. Zamula |
| author_facet | Yu.V. Yurchenko O.A. Korniienko O.I. Bykov A.V. Samelyuk S.V. Yushkevych M.V. Zamula |
| author_sort | Yu.V. Yurchenko |
| collection | DOAJ |
| description | The phase equilibria in the ZrO2–HfO2–Nd2O3 ternary system at 1500 °C and 1700 °C were studied over the whole concentration range by X-ray diffraction and microstructural analyses. Corresponding isothermal sections were constructed from the data obtained. It was found that solid solutions in this system are derived from a tetragonal (T) modification of ZrO2, a monoclinic (M) modification of HfO2, a hexagonal (A) modification of Nd2O3, a cubic phase with a fluorite (F) structure of ZrO2 (HfO2), and an ordered phase with a pyrochlore (Py) structure of Nd2Zr2O7 (Nd2Hf2O7). The phase boundaries and unit cell lattice parameters were determined. The solubility of Nd2O3 in M − HfO2 is pretty low and about less than 1 mol%, as confirmed by XRD and microstructural analyses. The ordered pyrochlore-type (Py) phase of Nd2Zr2O7 (Nd2Hf2O7) forms continuous series of solid solutions at 1500 °C and 1700 °C. The homogeneous region of these continuous series of solid solutions changes insignificantly with increasing temperature. The changes in the construction of the isothermal section of the ZrO2-HfO2-Nd2O3 phase diagram at 1500 °C compared to 1700 °C are associated with the thermal stability of cubic fluorite-type (F) solid solutions. Other phases in the ZrO2-HfO2-Nd2O3 ternary system are not detected at the studied temperatures. |
| first_indexed | 2024-03-12T13:10:49Z |
| format | Article |
| id | doaj.art-f1470ebb680549b59b780a340a3e2ae1 |
| institution | Directory Open Access Journal |
| issn | 2666-5395 |
| language | English |
| last_indexed | 2024-03-12T13:10:49Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Open Ceramics |
| spelling | doaj.art-f1470ebb680549b59b780a340a3e2ae12023-08-28T04:23:23ZengElsevierOpen Ceramics2666-53952023-09-0115100421Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °CYu.V. Yurchenko0O.A. Korniienko1O.I. Bykov2A.V. Samelyuk3S.V. Yushkevych4M.V. Zamula5Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, O.Pritsak Str. 3, Kyiv, 03680, UkraineCorresponding author.; Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, O.Pritsak Str. 3, Kyiv, 03680, UkraineFrantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, O.Pritsak Str. 3, Kyiv, 03680, UkraineFrantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, O.Pritsak Str. 3, Kyiv, 03680, UkraineFrantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, O.Pritsak Str. 3, Kyiv, 03680, UkraineFrantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, O.Pritsak Str. 3, Kyiv, 03680, UkraineThe phase equilibria in the ZrO2–HfO2–Nd2O3 ternary system at 1500 °C and 1700 °C were studied over the whole concentration range by X-ray diffraction and microstructural analyses. Corresponding isothermal sections were constructed from the data obtained. It was found that solid solutions in this system are derived from a tetragonal (T) modification of ZrO2, a monoclinic (M) modification of HfO2, a hexagonal (A) modification of Nd2O3, a cubic phase with a fluorite (F) structure of ZrO2 (HfO2), and an ordered phase with a pyrochlore (Py) structure of Nd2Zr2O7 (Nd2Hf2O7). The phase boundaries and unit cell lattice parameters were determined. The solubility of Nd2O3 in M − HfO2 is pretty low and about less than 1 mol%, as confirmed by XRD and microstructural analyses. The ordered pyrochlore-type (Py) phase of Nd2Zr2O7 (Nd2Hf2O7) forms continuous series of solid solutions at 1500 °C and 1700 °C. The homogeneous region of these continuous series of solid solutions changes insignificantly with increasing temperature. The changes in the construction of the isothermal section of the ZrO2-HfO2-Nd2O3 phase diagram at 1500 °C compared to 1700 °C are associated with the thermal stability of cubic fluorite-type (F) solid solutions. Other phases in the ZrO2-HfO2-Nd2O3 ternary system are not detected at the studied temperatures.http://www.sciencedirect.com/science/article/pii/S2666539523000937Phase equilibriaPhase diagramUnit cell parametersZirconiaZirconium dioxideHafnia |
| spellingShingle | Yu.V. Yurchenko O.A. Korniienko O.I. Bykov A.V. Samelyuk S.V. Yushkevych M.V. Zamula Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C Open Ceramics Phase equilibria Phase diagram Unit cell parameters Zirconia Zirconium dioxide Hafnia |
| title | Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C |
| title_full | Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C |
| title_fullStr | Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C |
| title_full_unstemmed | Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C |
| title_short | Phase equilibria in the ZrO2–HfO2–Nd2O3 system at 1500 °C and 1700 °C |
| title_sort | phase equilibria in the zro2 hfo2 nd2o3 system at 1500 °c and 1700 °c |
| topic | Phase equilibria Phase diagram Unit cell parameters Zirconia Zirconium dioxide Hafnia |
| url | http://www.sciencedirect.com/science/article/pii/S2666539523000937 |
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