SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001106

Beamline

BL10XU (High Pressure Research)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	metal, alloy, insulator, ceramics, crystal
C. Technique	X-ray diffraction
D. Technique (detail)	powder diffraction
E. Particular condition	high pressure (DAC), low-T (~ liquid He)
F. Photon energy	X-ray (4-40 keV)
G. Target information	crystal structure, phase transition

Industrial keywords

level 1---Application area	electric component, industrial material, others
level 2---Target
level 3---Target (detail)
level 4---Obtainable information	electronic state
level 5---Technique	diffraction

Classification

A80.12 semiconductor, A80.14 magnetic materials, M10.20 powder diffraction

Body text

The structural properties of FeS at low temperature and under pressures were studied by the x-ray diffraction on BL10XU. FeS undergoes two successive first order structural phase transitions. Figure shows typical observed x-ray diffraction patterns below and above 5 GPa, which gave fits to the troilite and MnP-type structures, respectively. Furthermore, it is found that there is a knee in the pressure dependence of volume in the troilite structure which is correspond to the semiconductor-metal transition. The transition is almost continues at 2.5 GPa and 17 K because there is a volume reduction less than 0.1% at the transition (H. Kobayashi et al., PRB, 71(2005)014110).

Figure. Typical x-ray diffraction profiles of FeS under high pressure (at 17K)
and pressure dependence of volume V.

[ H. Kobayashi, T. Kamimura, Y. Ohishi, N. Takeshita and Mori, Physical Review B 71, 014110 (2005), Fig. 1, 2,
©2005 American Physical Society ]

Source of the figure

Original paper/Journal article

Journal title

PRB, 71(2005)014110

Figure No.

1,2

Technique

The He flow type cryostat for the DAC can be mounted on the BL10XU's diffractometer for low temperature experiments down to 10 K as shown in figure. Combining the on-line pressure measurement system described above with a He-gas driven DAC, in which the pressure can be controlled remotely, one can conduct high- pressure experiment at low temperature very efficiently.

Figure. Cryostat and DAC of BL10XU

Source of the figure

Presentation material for Beamline Report

Required time for experimental setup

1 shift(s)

Instruments

Instrument	Purpose	Performance
DAC cryostat	high pressure/low temperature	70GPa, 10K

References

Related experimental techniques

Questionnaire

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?

Four-nine shifts