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研究代表者 東北大学大学院理学研究科教授 大谷栄治. 1. 地球中心領域. どのような組成? どのような状態? 温度は何度か?. 核マントル境界 135GPa, 3500K. 地球中心 365GPa, 4000~8000K. 地球中心 365 GPa 4000~8000 K 未達成 物性データ皆無. 信頼できる地球内部観測:地震波速度(=音速)、密度解釈に 物性データ が必要だが、 密度の情報:多 しかし 地震波速度= 音速の情報:稀少 これまでの研究は、温度・圧力の外挿. 2. 核. 次々に明らかになる核の新観測事実. - PowerPoint PPT Presentation
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2365 GPa4000~8000 K135GPa, 3500K365GPa,4000~8000K
3(Innermost inner core)Laske and Masters (1999)
:4
Labrosse et al. (Nature, 2007)Murakami and Bass (PRL, 2010), Ohtani (PEPI, 1983), Ohtani and Maeda (EPSL, 2000)5
INTRODUCTIONSano, Ohtani et al. (2008), GRL6
27
150GPa NaCl-B2 MgO5000 K @300 GPa
A diamond anvil compressed at 374 GPa and 300 KAsanuma et al. AIRAPT (2009)8
(ED-MS) (SP-8)SP89
100~350 GPa, 2000 KAlfred BaronSP8SP8-BL3510
11
150GPa,1500 K)150GPaJay Bass12
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:150 GPaSPring8, BL10XUSP8200GPaFe2O3Jay Bass151GPaAlfred BaronSPring8, BL352
44A1
A2(S) X:151 GPa
200 GPa
150GPa
A3
A31. 5000 K @300 GPa
2.(Fe) (ED-MS): ED-MS
3100~350 GPa150 GPa, 1500 K): ~100 GPa30GPa, 1500 K
XRD (BL10XU) a) : 135 GPa, 3000 K (Hirao et al., 2006; Sakai et al., 2007) b) 254 GPa, 3500 K (Asanuma et al., 2008): FeSiFeNiSiFe3S(FeNi)3SFeHx c) 376 GPa, 700 K(Asanuma et al., 2009)
2. 150 GPa
3. -MS()135 GPa: Fe3+3 (BL11XU)
4. IXSFeNiSi @151 GPa (BL35XU)A4
A5
Typical X-ray diffraction profile for Fe-9.8 wt% Ni-4.0 wt% Si under high pressures at ambient temperatureA6The hcp phase is stable at the pressure of the center of the Earth300KA diamond anvil compressed at 374 GPa and 300 KAsanuma et al. (2009, AIRAPT)Diffraction patterns of Fe0.83Ni0.09Si0.08(Fe-9.8wt%Ni-4wt%Si) at 300 K
57FeXMitsui et al. (2007) JJAP, 46, L930.57Fe-XSmirnov et al. (1997) Phys. Rev. B 55, 5811.Mitsui et al. (2007) Jpn. J. Appl. Phys. 46, L821.E~neV57FeBO3@ ~ Neel temp. External magnetic fieldA7
BL10XUXRD57Fe-MSXXRDMS X1030 min.!? BL10XU etc.XDAC (IP/CCD)XRDIN OUT 14.4 keV(43.2 keV)@BL10XUA8
SPring-8 BL10XUXRD57Fe-MSSR
SR+XA9
57Fe100Energy-domain SR Mssbauer SpectroscopyNuclear Forward Scattering: NFS (Time-domain)DACRadioactive Isotope Mssbauer SpectroscopyA10
57Fe300 GPaGdFe2@302 GPa (Mitsui, Hirao et al. (2009) JSR)A11
High-pressure Brillouin scattering using DACDiamond Anvil Cell (DAC) apparatusAr laser (514.5nm)6-pass tandem Fabry-Perot interferometer
High-pressure Brillouin scattering systemA12
Combined system for simultaneous measurementsBrillouin scattering + XRD + Laser heatingMurakami et al., PEPI, 2009A13
*FeBO3(333)
11XU09XU11XU
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BL11XU
1 deg. = 60 min. = 3600 sec.1/60 deg. = 1 min. = 60 sec.1/3600 deg. = 1 sec.