Formation of metastable phases in Zr-ion-irradiated Al2O3 upon thermal annealing
Formation of metastable phases in Zr-ion-irradiated corundum alumina (Al2O3) upon thermal annealing was examined using transmission electron microscopy. A metastable cubic spinel phase was formed in the topmost layer of the as-irradiated microstructure. During thermal annealing at temperatures rangi...
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| Veröffentlicht in: | Journal of electron microscopy 2017-12, Vol.66 (6), p.388-396 |
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| container_title | Journal of electron microscopy |
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| creator | Oka, Naomasa Ishimaru, Manabu Tane, Masakazu Sina, Younes McHargue, Carl J Sickafus, Kurt E Alves, Eduardo |
| description | Formation of metastable phases in Zr-ion-irradiated corundum alumina (Al2O3) upon thermal annealing was examined using transmission electron microscopy. A metastable cubic spinel phase was formed in the topmost layer of the as-irradiated microstructure. During thermal annealing at temperatures ranging from 1073 to 1273 K, this spinel layer grew in extent via an unusual corundum-to-spinel phase transformation. A normal spinel-to-corundum phase transformation was observed at post-irradiation annealing temperatures greater than 1473 K. In addition, ZrO2 nanocrystals embedded in α-Al2O3 were observed to form at these higher temperatures. High-resolution transmission electron microscopy observations and electron diffraction experiments revealed that the structure of the ZrO2 precipitates observed in this study are consistent with a high-pressure metastable orthorhombic phase of ZrO2 known as the Ortho-I phase. |
| doi_str_mv | 10.1093/jmicro/dfx028 |
| format | Article |
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A metastable cubic spinel phase was formed in the topmost layer of the as-irradiated microstructure. During thermal annealing at temperatures ranging from 1073 to 1273 K, this spinel layer grew in extent via an unusual corundum-to-spinel phase transformation. A normal spinel-to-corundum phase transformation was observed at post-irradiation annealing temperatures greater than 1473 K. In addition, ZrO2 nanocrystals embedded in α-Al2O3 were observed to form at these higher temperatures. High-resolution transmission electron microscopy observations and electron diffraction experiments revealed that the structure of the ZrO2 precipitates observed in this study are consistent with a high-pressure metastable orthorhombic phase of ZrO2 known as the Ortho-I phase.</description><identifier>ISSN: 0022-0744</identifier><identifier>EISSN: 2050-5701</identifier><identifier>EISSN: 1477-9986</identifier><identifier>DOI: 10.1093/jmicro/dfx028</identifier><identifier>PMID: 28992044</identifier><language>eng</language><publisher>England: Oxford Publishing Limited (England)</publisher><subject>Alumina ; Aluminum oxide ; Annealing ; Corundum ; Diffraction ; Electron diffraction ; Electron microscopy ; Electrons ; Irradiation ; Metastable phases ; Microstructure ; Nanocrystals ; Orthorhombic phase ; Phase transitions ; Post-irradiation ; Precipitates ; Radiation ; Spinel ; Transmission electron microscopy ; Zirconium ; Zirconium dioxide</subject><ispartof>Journal of electron microscopy, 2017-12, Vol.66 (6), p.388-396</ispartof><rights>The Author 2017. Published by Oxford University Press on behalf of The Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.</rights><rights>Copyright Oxford Publishing Limited(England) Dec 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c343t-21f41efd689bbde479239385a870d519b37bfffa1bcbde629c218127e5f5eff73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/28992044$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Oka, Naomasa</creatorcontrib><creatorcontrib>Ishimaru, Manabu</creatorcontrib><creatorcontrib>Tane, Masakazu</creatorcontrib><creatorcontrib>Sina, Younes</creatorcontrib><creatorcontrib>McHargue, Carl J</creatorcontrib><creatorcontrib>Sickafus, Kurt E</creatorcontrib><creatorcontrib>Alves, Eduardo</creatorcontrib><title>Formation of metastable phases in Zr-ion-irradiated Al2O3 upon thermal annealing</title><title>Journal of electron microscopy</title><addtitle>Microscopy (Oxf)</addtitle><description>Formation of metastable phases in Zr-ion-irradiated corundum alumina (Al2O3) upon thermal annealing was examined using transmission electron microscopy. A metastable cubic spinel phase was formed in the topmost layer of the as-irradiated microstructure. During thermal annealing at temperatures ranging from 1073 to 1273 K, this spinel layer grew in extent via an unusual corundum-to-spinel phase transformation. A normal spinel-to-corundum phase transformation was observed at post-irradiation annealing temperatures greater than 1473 K. In addition, ZrO2 nanocrystals embedded in α-Al2O3 were observed to form at these higher temperatures. High-resolution transmission electron microscopy observations and electron diffraction experiments revealed that the structure of the ZrO2 precipitates observed in this study are consistent with a high-pressure metastable orthorhombic phase of ZrO2 known as the Ortho-I phase.</description><subject>Alumina</subject><subject>Aluminum oxide</subject><subject>Annealing</subject><subject>Corundum</subject><subject>Diffraction</subject><subject>Electron diffraction</subject><subject>Electron microscopy</subject><subject>Electrons</subject><subject>Irradiation</subject><subject>Metastable phases</subject><subject>Microstructure</subject><subject>Nanocrystals</subject><subject>Orthorhombic phase</subject><subject>Phase transitions</subject><subject>Post-irradiation</subject><subject>Precipitates</subject><subject>Radiation</subject><subject>Spinel</subject><subject>Transmission electron microscopy</subject><subject>Zirconium</subject><subject>Zirconium dioxide</subject><issn>0022-0744</issn><issn>2050-5701</issn><issn>1477-9986</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNpdkD1PwzAQhi0EolXpyIoisbCY-iuxPVYVBSSkMsDCEjnJmbrKF3Yiwb_HKIWBW2645311ehC6pOSWEs1Xh8aVvltV9pMwdYLmjKQEp5LQUzQnhDFMpBAztAzhQOKolBKRnaMZU1ozIsQcPW8735jBdW3S2aSBwYTBFDUk_d4ECIlrkzeP4xk7703lzABVsq7ZjidjH0PDHmK-Tkzbgqld-36BzqypAyyPe4Fet3cvmwf8tLt_3KyfcMkFHzCjVlCwVaZ0UVQgpGZcc5UaJUmVUl1wWVhrDS3KeM6YLhlVlElIbQrWSr5AN1Nv77uPEcKQNy6UUNemhW4MOdVCZ5pzxSN6_Q89dKNv43eRUlIQrZSOFJ6oaDQEDzbvvWuM_8opyX9s55PtfLId-atj61g0UP3Rv275NzGSfCs</recordid><startdate>20171201</startdate><enddate>20171201</enddate><creator>Oka, Naomasa</creator><creator>Ishimaru, Manabu</creator><creator>Tane, Masakazu</creator><creator>Sina, Younes</creator><creator>McHargue, Carl J</creator><creator>Sickafus, Kurt E</creator><creator>Alves, Eduardo</creator><general>Oxford Publishing Limited (England)</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7SC</scope><scope>7SE</scope><scope>7SP</scope><scope>7SR</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>JG9</scope><scope>JQ2</scope><scope>K9.</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>NAPCQ</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>20171201</creationdate><title>Formation of metastable phases in Zr-ion-irradiated Al2O3 upon thermal annealing</title><author>Oka, Naomasa ; 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A metastable cubic spinel phase was formed in the topmost layer of the as-irradiated microstructure. During thermal annealing at temperatures ranging from 1073 to 1273 K, this spinel layer grew in extent via an unusual corundum-to-spinel phase transformation. A normal spinel-to-corundum phase transformation was observed at post-irradiation annealing temperatures greater than 1473 K. In addition, ZrO2 nanocrystals embedded in α-Al2O3 were observed to form at these higher temperatures. High-resolution transmission electron microscopy observations and electron diffraction experiments revealed that the structure of the ZrO2 precipitates observed in this study are consistent with a high-pressure metastable orthorhombic phase of ZrO2 known as the Ortho-I phase.</abstract><cop>England</cop><pub>Oxford Publishing Limited (England)</pub><pmid>28992044</pmid><doi>10.1093/jmicro/dfx028</doi><tpages>9</tpages></addata></record> |
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| ispartof | Journal of electron microscopy, 2017-12, Vol.66 (6), p.388-396 |
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| source | Oxford University Press Journals All Titles (1996-Current); Alma/SFX Local Collection |
| subjects | Alumina Aluminum oxide Annealing Corundum Diffraction Electron diffraction Electron microscopy Electrons Irradiation Metastable phases Microstructure Nanocrystals Orthorhombic phase Phase transitions Post-irradiation Precipitates Radiation Spinel Transmission electron microscopy Zirconium Zirconium dioxide |
| title | Formation of metastable phases in Zr-ion-irradiated Al2O3 upon thermal annealing |
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