大型放射光施設 SPring-8

問い合わせ番号

SOL-0000001204

ビームライン

BL04B1（高温高圧）

学術利用キーワード

A. 試料	無機材料, 計測法、装置に関する研究
B. 試料詳細	金属・合金, 絶縁体・セラミックス, 液体・融体
C. 手法	透過Ｘ線計測, 吸収、及びその二次過程
D. 手法の詳細
E. 付加的測定条件	高圧（大型プレス）, 応力付加、変形, 高温（>>500度）, 時分割（マイクロ秒）
F. エネルギー領域	Ｘ線（>40 keV）
G. 目的・欲しい情報	結合状態, 構造変化, 形態・巨視的構造

産業利用キーワード

階層1	工業材料, その他
階層2
階層3
階層4	液体・非晶質構造
階層5	イメージング

分類

A60.20 環境物質, A80.20 金属・構造材料, A80.30 無機材料

利用事例本文

Viscosity of melt under high pressure has been measured using a falling sphere method, where the viscosity is determined by the sinking velocity of sphere using Stokes equation. An x-ray radiography technique with synchrotron radiation is very useful for the falling sphere viscosity measurement, because it enables us in situ observation of the sinking process and determination of the reliable viscosity. Figure shows the observed images of Pt sphere sinking in NaAlSi₃O₈ melt at high pressure and high temperature using the SPEED-1500. The high-speed and high-resolution CCD camera provided very good visual contrast between the Pt sphere and melt possible in a short exposure time (1/30 s). The high pressure viscometry using the X-ray radiography technique is very promising for the precise viscosity measurement to various melts in Earths interior, such as magma and outer core melt.

Fig. Real-time images of Pt sphere sinking in NaAlSi₃O₈ melt at high pressure and high temperature (4.2 GPa and 1700℃).

[ K. Funakoshi, A. Suzuki and H. Terasaki, Journal of Physics :Condensed Matter 14, 11343-11347 (2002), Fig. 3,
©2002 Institute of Physics and IOP Publishing, Ltd. ]

画像ファイルの出典

原著論文/解説記事

誌名

J. Phys. :Condens. Matter, 14, 11343(2002)

図番号

3

測定手法

A high-resolution CCD camera is attached to the large-volume press so that we can see the macroscopic change of the sample shape under high pressure and high temperature using an X-ray radiography technique (Fig. 1). The use of the X-ray radiography technique does not only make it easy to adjust the X-ray beam to the desired position in the sample, but has also led to the development of new techniques to observe dynamic processes under high-pressure, such as sample deformation, melting. As is shown in fig. 1, the incident white X-ray from the bending magnet irradiates the sample cell through the anvil gap, and an image of the sample is projected on the fluorescence screen. This image is then magnified and detected by a high-resolution CCD camera. Real-time images of the sample are captured and recorded in a computer. Recently, a new X-ray radiography system combining with a high-magnification lens and a high-speed CCD camera was installed, and each image data can be captured at intervals of 1/125 second with the resolution of less than 4 μm/pixels (Fig. 2). The high-speed X-ray radiography system has been applied to the viscosity experiments of the melts under pressure using the “falling sphere” technique.

Fig. 1. A schematic drawing of the X-ray radiography system on the large-volume press.

Fig. 2. New X-ray radiography system combining with a high-magnification lens and a high-speed CCD camera.

画像ファイルの出典

BL評価レポート

ページ

16

測定準備に必要なおおよその時間

1 日

測定装置

装置名	目的	性能
SPEED-1500	High pressure and high temperature experiment	2500 K, 30 GPa

参考文献

文献名
J. Phys. :Condes. Matter, 14, 11343(2002)

関連する手法

アンケート

SPring-8だからできた測定。他の施設では不可能もしくは難しい
本ビームラインの主力装置を使っている

測定の難易度

中程度

データ解析の難易度

中程度

図に示した全てのデータを取るのにかかったシフト数

2～3シフト