液体Rb-Se混合系におけるvoidと「ゆらぎ構造」

• 丸山 健二

  新潟大学理学部

• 遠藤 裕久

  京都大学理学部

• 星野 英興

  弘前大学教育学部

書誌事項

タイトル別名

• Structure of liquid Rb-Se mixtures: void and fluctuation
• チュウセイシ サイエンス エキタイ Rb Se コンゴウケイ ニ オケル void ト ユラギ コウゾウ

抄録

Neutron diffraction and EXAFS measurements, and the detailed structural modeling by reverse Monte Carlo simulation have been performed in order to study the short-and intermediate-range structures of liquid Rb-Se mixtures. The Se chains in the liquid mixture are strongly bent to form horseshoe-like Se chains with Rb atoms at the chain ends, creating a large amount of voids. The interaction between Rb and Se atoms is weak and Rb atoms come close together. Near the boundary of the miscibility gap at low temperature the short Se chains link up to form a large cluster, and Rb atoms sit around it. The structure factor S(Q) in the liquid mixture has a small pre-peak at 1.3Å^-1. The computed partial S_ij(Q) for the RMC model indicates that the pre-peak is associated with the Se-Se interchain component of S(Q). From the void analysis using Delaunay simplices it has been revealed that the observed pre-peak corresponds to a pre-peak in the concentration-concentration structure factor due to the chemically ordered packing of the voids and Se chains in the structure.

収録刊行物

• 波紋

  波紋 16 (2), 110-115, 2006

  日本中性子科学会

キーワード

• Rb-Se mixture
• phase separation
• reverse Monte Carlo method
• concentration fluctuation

詳細情報

• CRID: 1390001205390936832
• NII論文ID: 130001998445
• NII書誌ID: AA11905115
• DOI: 10.5611/hamon.16.110
• ISSN: 1884636X
• ISSN: 1349046X
• NDL書誌ID: 7982343
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7982343
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