SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001214

Beamline

BL10XU (High Pressure Research)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	superconductor, ferroelectric material, crystal
C. Technique	X-ray diffraction
D. Technique (detail)	powder diffraction
E. Particular condition	high pressure (DAC)
F. Photon energy	X-ray (4-40 keV)
G. Target information	chemical bonding, charge density

Industrial keywords

level 1---Application area	storage device, others
level 2---Target
level 3---Target (detail)
level 4---Obtainable information	electronic state, valence
level 5---Technique	diffraction

Classification

M10.20 powder diffraction

Body text

The charge density study of Cs₂Au₂Br₆ under pressure were performed by the powder x-ray diffraction at BL10XU and MEM/Rietveld analysis.It reveals that the structural change of Cs₂Au₂Br₆ by applying pressure occurs basically at electron level, such as valence state change and chemical bonding, which may be called the electronic phase transition(M. Sakata et al., Journal of Physics and Chemistry of Solids, 65(2004)1973).

Figure. The MEM charge densities od Cs₂Au₂Br₆ for (002) section under pressure.

[ M. Sakata, T. Itsubo, E. Nishibori, Y. Moritomo, N. Kojima, Y. Ohishi and M. Takata, Journal of Physics and Chemistry of Solids 65, 1973-1976 (2004), Fig. 6,
©2004 Pergamon Press, Elsevier Science Publishers ]

Source of the figure

Original paper/Journal article

Journal title

Journal of Physics and Chemistry of Solids, 65(2004)1973

Figure No.

6

Technique

The high pressure research beamline BL10XU is designed to perform the X-ray diffraction structure analysis under high-pressure and low/high temperature, using the high brilliance X-rays from the in-vacuum type undulator.  The monochromatic and focused X-rays irradiate the sample enclosed in a DAC system, which can generate the pressure up to 300 GPa. The most of the conventional limitations (extremely small size sample area (<100mm), limited diffraction windows, x-ray absorption by diamond and so on) for the DAC high pressure diffraction experiment was extended and upgraded to the high resolution, high angular resolution and high counting statistics diffraction experiment as well as rapid data measurement.

Source of the figure

Presentation material for Beamline Report

Required time for experimental setup

2 hour(s)

Instruments

Instrument	Purpose	Performance
DAC diffractometer	powder x-ray diffraction	powder x-ray diffraction under pressure

References

Related experimental techniques

Powder x-ray diffraction, single crystal x-ray diffraction, neutron diffraction

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

With a great skill

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

Two-three shifts