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Nucleation-Controlled Phase Selection in Rapid Solidification from Undercooled Melt of DyMnO<sub>3</sub>
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- Hayasaka You
- Graduate School of Engineering, Chiba Institute of Technology
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- Kuribayashi Kazuhiko
- Research Liaison Centre, Chiba Institute of Technology Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
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- Shiratori Suguru
- Department of Mechanical Systems Engineering, Faculty of Engineering, Tokyo City University
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- Ozawa Shumpei
- Department of Advanced Materials Science and Engineering, Chiba Institute of Technology
Bibliographic Information
- Other Title
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- DyMnO<sub>3</sub>の過冷却融液からの急速凝固における核形成律速相選択
- DyMnO₃の過冷却融液からの急速凝固における核形成律速相選択
- DyMnO ₃ ノ カレイキャクユウエキ カラ ノ キュウソク ギョウコ ニ オケル カク ケイセイ リッソクソウ センタク
- Nucleation-Controlled Phase Selection in Rapid Solidification from Undercooled Melt of DyMnO₃
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Description
<p>The equilibrium crystal structure of LnMnO3 (Ln: lanthanide) has been reported to be orthorhombic when La3+ to Dy3+ are used as Ln3+, and hexagonal when Ho3+ to Lu3+ are used. Whereas Kumar et al. reported a two-phase structure of orthorhombic and hexagonal phases is formed in DyMnO3 when it was solidified from the undercooled melt under containerless state. The reason for the formation of the two-phase structure was not thoroughly addressed and discussed. We investigated the formation mechanism for the two-phase structure from the undercooled melt of DyMnO3 in detail. As a result, the surface morphology, microstructure, and crystal structure of the samples, in which the nucleation was forced at a predetermined temperature with a Mo needle, indicated that the hexagonal and orthorhombic phases are dominant at high and low temperatures, respectively. When the sample was quenched from below 1670 K in a water bath, as-solidified sample consisted of h-DyMnO3 and o-DyMnO3. Whereas a single phase of h-DyMnO3 was obtained in the sample quenched from above 1670 K. This phenomenon can be quantified in terms of nucleation-rate determined phase selection. That is, the activation energy for forming a critical nucleus calculated based on the model of the crystal-melt interface proposed by Turnbull and Speapen suggests that the o-DyMnO3 phase can be heterogeneously nucleated on the interface of the initially formed h-DyMnO3 phase.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 85 (2021) 155–161. The abstract and captions of Figs. 1–10 are modified.</p>
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 62 (7), 982-987, 2021-07-01
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390288480070775424
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- NII Article ID
- 130008002722
- 130008056658
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 18806880
- 24337501
- 13459678
- 00214876
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- Web Site
- http://id.ndl.go.jp/bib/031393569
- https://ndlsearch.ndl.go.jp/books/R000000004-I031393569
- http://id.ndl.go.jp/bib/031532549
- https://ndlsearch.ndl.go.jp/books/R000000004-I031532549
- https://www.jstage.jst.go.jp/article/jinstmet/85/4/85_J2020061/_pdf
- https://www.jstage.jst.go.jp/article/matertrans/62/7/62_MT-M2021047/_pdf
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- JaLC
- NDL Search
- Crossref
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- Abstract License Flag
- Disallowed