Zr/Hf-containing metallocene-based ceramic precursors
Polymer-derived-ceramic (PDC) route is an excellent strategy to tailor components at the molecular level, while existing synthetic methods face various problems such as complex preparation, multi-step reaction, and high conversion temperature, etc. Here, we propose an approach to prepare Zr-, Hf-, o...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424005714 |
| _version_ | 1797259923429523456 |
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| author | Caiyan Wang Lei Shi Zihao Qiao Weilong Chen Zhengwen Li Bin Li |
| author_facet | Caiyan Wang Lei Shi Zihao Qiao Weilong Chen Zhengwen Li Bin Li |
| author_sort | Caiyan Wang |
| collection | DOAJ |
| description | Polymer-derived-ceramic (PDC) route is an excellent strategy to tailor components at the molecular level, while existing synthetic methods face various problems such as complex preparation, multi-step reaction, and high conversion temperature, etc. Here, we propose an approach to prepare Zr-, Hf-, or Zr/Hf-containing metallocene-based ceramic precursors, which are constructed by the alkylation reaction between cyclopentadienyl ligand and methylene. Through the homogeneous and one-pot reaction occurs, we collect the target products. The reaction condition is mild, and the conversion temperature (1400 °C) is relatively low, and with a high ceramic yield (57.50–66.34%). The obtained metal-containing polymers are further converted to the orthorhombic phase (M7O8.79F9.71, M = Zr, Hf) after pyrolysis at 800 °C. Annealing at an intermediate temperature of 1400 °C in an argon atmosphere results in cubic crystalline ZrC or HfC nanoparticles embedded in a ceramic matrix. The free carbons are in-situ formed after high-temperature treatment, and higher disorder of carbons is observed with increasing temperature. This work provides a good strategy for the potential precursor of ultrahigh-temperature ceramics. |
| first_indexed | 2024-04-24T23:17:08Z |
| format | Article |
| id | doaj.art-46f5816ef9a34cd99ad195713e45b388 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T23:17:08Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-46f5816ef9a34cd99ad195713e45b3882024-03-17T07:54:33ZengElsevierJournal of Materials Research and Technology2238-78542024-05-0130245255Zr/Hf-containing metallocene-based ceramic precursorsCaiyan Wang0Lei Shi1Zihao Qiao2Weilong Chen3Zhengwen Li4Bin Li5School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, ChinaCorresponding author.; School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, ChinaSchool of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, ChinaSchool of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, ChinaSchool of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, ChinaCorresponding author.; School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, ChinaPolymer-derived-ceramic (PDC) route is an excellent strategy to tailor components at the molecular level, while existing synthetic methods face various problems such as complex preparation, multi-step reaction, and high conversion temperature, etc. Here, we propose an approach to prepare Zr-, Hf-, or Zr/Hf-containing metallocene-based ceramic precursors, which are constructed by the alkylation reaction between cyclopentadienyl ligand and methylene. Through the homogeneous and one-pot reaction occurs, we collect the target products. The reaction condition is mild, and the conversion temperature (1400 °C) is relatively low, and with a high ceramic yield (57.50–66.34%). The obtained metal-containing polymers are further converted to the orthorhombic phase (M7O8.79F9.71, M = Zr, Hf) after pyrolysis at 800 °C. Annealing at an intermediate temperature of 1400 °C in an argon atmosphere results in cubic crystalline ZrC or HfC nanoparticles embedded in a ceramic matrix. The free carbons are in-situ formed after high-temperature treatment, and higher disorder of carbons is observed with increasing temperature. This work provides a good strategy for the potential precursor of ultrahigh-temperature ceramics.http://www.sciencedirect.com/science/article/pii/S2238785424005714Metal-containing polymerPrecursorPolymer-derived-ceramic |
| spellingShingle | Caiyan Wang Lei Shi Zihao Qiao Weilong Chen Zhengwen Li Bin Li Zr/Hf-containing metallocene-based ceramic precursors Journal of Materials Research and Technology Metal-containing polymer Precursor Polymer-derived-ceramic |
| title | Zr/Hf-containing metallocene-based ceramic precursors |
| title_full | Zr/Hf-containing metallocene-based ceramic precursors |
| title_fullStr | Zr/Hf-containing metallocene-based ceramic precursors |
| title_full_unstemmed | Zr/Hf-containing metallocene-based ceramic precursors |
| title_short | Zr/Hf-containing metallocene-based ceramic precursors |
| title_sort | zr hf containing metallocene based ceramic precursors |
| topic | Metal-containing polymer Precursor Polymer-derived-ceramic |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424005714 |
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