SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001204

Beamline

BL04B1 (High Temperature and High Pressure Research)

Scientific keywords

A. Sample category	inorganic material, research on method, instrumentation
B. Sample category (detail)	metal, alloy, insulator, ceramics, liquid, melt
C. Technique	X-ray transmission, absorption and its secondary process
D. Technique (detail)
E. Particular condition	high pressure (press), tensile loading, high-T (> 500 C), time-resolved (µs)
F. Photon energy	X-ray (> 40 keV)
G. Target information	chemical bonding, structural change, morphology

Industrial keywords

level 1---Application area	industrial material, others
level 2---Target
level 3---Target (detail)
level 4---Obtainable information	structure of non-crystalline material
level 5---Technique	imaging

Classification

A60.20 environment, A80.20 metal ・material, A80.30 inorganic material

Body text

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. ]

Source of the figure

Original paper/Journal article

Journal title

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

Figure No.

3

Technique

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.

Source of the figure

Beamline Report

Page

16

Required time for experimental setup

1 day(s)

Instruments

Instrument	Purpose	Performance
SPEED-1500	High pressure and high temperature experiment	2500 K, 30 GPa

References

Document name
J. Phys. :Condes. Matter, 14, 11343(2002)

Related experimental techniques

Questionnaire

The measurement was possible only in SPring-8. Impossible or very difficult in other facilities.
This solution is an application of a main instrument of the beamline.

Ease of measurement

Middle

Ease of analysis

Middle

How many shifts were needed for taking whole data in the figure?

Two-three shifts