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Stability of magnesite and its high-pressure form in lowermost mantle

  • Only SPring-8

Inquiry number

SOL-0000001079

Beamline

BL10XU (High Pressure Research)

Scientific keywords

A. Sample category inorganic material
B. Sample category (detail) insulator, ceramics, crystal, mineral,rock
C. Technique X-ray diffraction
D. Technique (detail) powder diffraction
E. Particular condition microbeam (> 10 µm), high pressure (DAC), high-T (> 500 C)
F. Photon energy X-ray (4-40 keV)
G. Target information crystal structure, phase transition

Industrial keywords

level 1---Application area industrial material, others
level 2---Target
level 3---Target (detail)
level 4---Obtainable information d-spacing (lattice parameter), crystal structure, elastic modulus
level 5---Technique diffraction

Classification

A80.30 inorganic material, M10.20 powder diffraction

Body text

The x-ray diffraction with the use of the DAC/LH (diamond anvil cell / laser-heating) system is a powerful technique to study in-situ structural observations of materials under high-pressure/temperature. Using this technique, one can measure the crystal structures of the mantle minerals or materials of the core under the inner-earth condition. The figure shows the x-ray diffraction profile changes and the phase diagram of magnesite (MgCO3) under the lower mantle pressure/temperature condition (30-120GPa/2000-2500K). These data reveal the fact that the magnesite transforms to an unknown form without any dissociation at the condition of 115GPa/2100K (depths of about 2600km) (M.Isshiki et al., Nature, 427(2004)60).

Figure. X-ray diffraction profiles and phase diagram of magnesite.

[ M. Isshiki, T. Irifune, K. Hirose, S. Ono, Y. Ohishi, T. Watanuki, E. Nishibori, M. Takata and M. Sakata, Nature 427, 60-63 (2004), Fig. 1, 2,
©2004 Nature Publishing Group ]

 

Source of the figure

Original paper/Journal article

Journal title

Nature, 427(2004)60

Figure No.

1,2

Technique

The DAC/LH (diamond anvil cell / laser-heating) technique can realize the environment of about 300GPa/4000K by delivering the focused laser beam (about 1 um wavelength) into the DAC sample chamber. Furthermore, the in-situ structural analysis can be performed under the high pressure/temperature condition by using the synchrotron x-ray diffraction.

Figure. schematic view and photograph of the LH system.

Source of the figure

Private communication/others

Description

JAMSTEC Nagayoshi Sata

Required time for experimental setup

3 hour(s)

Instruments

Instrument Purpose Performance
Laser-heating system high pressure/temperature 300GPa, 4000K

References

Document name
廣瀬敬、高圧力の科学と技術、14(2004)255

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.
Similar experiments account for more than 30% of the beamline's subject.
This solution is application of a new instrument installed in the past two years.

Ease of measurement

With a great skill

Ease of analysis

Middle

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

Four-nine shifts

Last modified 2006-03-30 11:12