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構造的観点からみたGd3RuO7 の相転移
https://nitech.repo.nii.ac.jp/records/2260
https://nitech.repo.nii.ac.jp/records/22600f20787a-1fc0-486d-92ee-3395bb96b18e
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
本文_fulltext (360.6 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper_04(1) | |||||||||||
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| 公開日 | 2011-08-10 | |||||||||||
| タイトル | ||||||||||||
| タイトル | Phase Transition of Gd3RuO7 rom a Structural Point of View | |||||||||||
| 言語 | en | |||||||||||
| タイトル | ||||||||||||
| タイトル | 構造的観点からみたGd3RuO7 の相転移 | |||||||||||
| 言語 | ja | |||||||||||
| 言語 | ||||||||||||
| 言語 | eng | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||
| 著者 |
石澤, 伸夫
× 石澤, 伸夫
× 中野, 裕美
× 立石, 賢司
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| 書誌情報 |
ja : セラミックス基盤工学研究センター年報 en : Annual report of the Ceramics Research Laboratory Nagoya Institute of Technology 巻 7, p. 7-16, 発行日 2008-03-31 |
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| 出版者 | ||||||||||||
| 出版者 | 名古屋工業大学セラミックス基盤工学研究センター | |||||||||||
| 言語 | ja | |||||||||||
| ISSN | ||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 1347-1694 | |||||||||||
| 書誌レコードID | ||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AA11625130 | |||||||||||
| 著者版フラグ | ||||||||||||
| 出版タイプ | VoR | |||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||
| 内容記述 | ||||||||||||
| 内容記述タイプ | Other | |||||||||||
| 内容記述 | Gd3RuO7, the ordered oxygen-deficient fluorite-type compound, undergoes a structural phasetransition between the P21nb and Cmcm modifications at around 382 K. This paper describesthe phase transition from a structural point of view, based on the high?temperature single-crystalX-ray and electron diffraction studies. The transition is almost reversible, and characterized byan additional tilt about the c axis that occurs in the low-temperature modification for half of theRuO6 octahedra in association with a reduction of apparent coordination number from 6+2 to 7for one-third of Gd atoms. Dimerization of the Ru array along the [-RuO5-]∞ zigzagging chainoccurs below the transition temperature, which provides a folding effect on the chain. The foldingtendency of the chain explains geometrically an expansion of the b-length and a compressionof the c-length near 382 K on cooling and vice versa on heating. The transition is similar to thosegiven in the literature for Sm3RuO7, Eu3RuO7, Sm3OsO7, Eu3OsO7 and Gd3OsO7, except thatone of crystallographically independent Gd atoms in the high-temperature Cmcm modificationis statically or dynamically distributed between two positions located very close with each other.The disordered distribution of the Gd atom in the high-temperature modification is presumablycorrelated with the octahedral tilts about the c axis, resulting in the experimental observation ofthe extremely prolate atomic displacement ellipsoid for the O1 atom in the cis position along thechain. The P21nb-Cmcm phase transition contains two competing mechanisms characterized bythe order-disorder transition of the librating [-Gd-RuO6-Gd-RuO6-Gd-] linkage along the b axis,and by the displacive-type dimerization of Ru atoms along the chain. The in situ electron diffractionexperiments suggested a possible existence of intermediate phase between the high- andlow-temperature modifications. | |||||||||||
| 言語 | en | |||||||||||
| 見出し | ||||||||||||
| 大見出し | <論文> | |||||||||||
| 言語 | ja | |||||||||||
| 見出し | ||||||||||||
| 大見出し | <Paper> | |||||||||||
| 言語 | en | |||||||||||
