Stability of magnesite and its high-pressure form in lowermost mantle
Inquiry number
SOL-0000001079
Beamline
BL10XU (High Pressure Research)
Scientific keywords
A. Sample category | inorganic material |
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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 |
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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 |
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Laser-heating system | high pressure/temperature | 300GPa, 4000K |
References
Document name |
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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