Volume 09, No.3

1. SPring-8の現状／PRESENT STATUS OF SPring-8

長期利用研究課題2004Bの募集について
Call for the Beam Time Application for Long Term Experiments

放射光利用研究促進機構　(財)高輝度光科学研究センター　Organization for the Promotion of Synchrotron Radiation Research, JASRI

Pages 164 - 165 Download PDF (17.07 KB)

2004B SPring-8共用ビームライン利用研究課題の募集について
Call for the Beam Time Application for the Public Beamlines at SPring-8

放射光利用研究促進機構　(財)高輝度光科学研究センター　Organization for the Promotion of Synchrotron Radiation Research, JASRI

Pages 166 - 173 Download PDF (40.53 KB)

2004B ナノテクノロジー総合支援プロジェクト対象課題の募集について
Call for the Beam Time Application for Nanotechnology Experiments

放射光利用研究促進機構　(財)高輝度光科学研究センター　Organization for the Promotion of Synchrotron Radiation Research, JASRI

Pages 174 - 177 Download PDF (27.63 KB)

2004B トライアルユース課題の募集について
Call for the Beam Time Application for Trial Use Experiments

放射光利用研究促進機構　(財)高輝度光科学研究センター　Organization for the Promotion of Synchrotron Radiation Research, JASRI

Page 178 Download PDF (15.19 KB)

第12回共同利用期間（2003B）において実施された利用研究課題
The Experiments in the 12th Research Period (2003B) at the Public Beamlines of SPring-8

放射光利用研究促進機構　(財)高輝度光科学研究センター　Organization for the Promotion of Synchrotron Radiation Research, JASRI

Pages 179 - 190 Download PDF (122.45 KB)

SPring-8運転・利用状況
SPring-8 Operational News

（財）高輝度光科学研究センター　研究調整部　Research Coordination Division, JASRI

Pages 191 - 192 Download PDF (15.92 KB)

論文発表の現状
Publications Resulting from Experiments at SPring-8

（財）高輝度光科学研究センター　利用業務部　User Administration Division, JASRI

Pages 193 - 194 Download PDF (24.59 KB)

2. 最近の研究から／FROM LATEST RESEARCH

全地球マントル領域におけるMgCO₃マグネサイトの安定性と炭素の地球深部における長期的循環 Stability o MgCO₃ Magnesite Throughout the Lower Mantle and Implications for the Long-term Recycling of Carbon in the Earthﾕs Interior.

入舩　徹男　IRIFUNE Tetsuo、一色（西堀）麻衣子　ISSHIKI(NISHIBORI) Maiko

愛媛大学　地球深部ダイナミクス研究センター　Geodynamics Research Center, Ehime University

Abstract: Carbonates are important constituents of marine sediments and play an important role in the long-term recycling of carbon in the Earth’s deep interior via subduction of oceanic plates. We studied the stability of magnesite, the major carbonate in the mantle, by in situ X-ray diffraction measurements using a combination of laser-heated diamond anvil cell (LHDAC) and synchrotron radiation at BL10XU. We found that magnesite is stable at pressure up to ~115 GPa, at temperatures of ~ 2100 - 2200K, whereas it transforms to a new phase at higher pressures. The diffraction data of the new phase, magnesiteⅡ, are reasonably indexed on the basis of an orthorhombic system, yielding a density of 5.2 g/cm³ at 119 GPa, at room temperature. The present results suggest that magnesite and its high-pressure form are the major hosts for carbon throughout the most parts of the Earth’s lower mantle.

Pages 195 - 199 Download PDF (179.75 KB)

従来の常識を破るガラス構造の発見
A Study of an Unusual Glass Prepared by the Containerless Method – Glass Formation at the Limit of Insufficient Network Formers –

小原　真司　KOHARA Shinji^[1]、鈴谷　賢太郎　SUZUYA Kentaro^[2]、竹内　謙　TAKEUCHI Ken^[3]

^[1]（財）高輝度光科学研究センター　利用研究促進部門Ⅰ　Materials Science Division, JASRI、^[2]日本原子力研究所　中性子利用研究センター　Neutron Science Research Center, Japan Atomic Energy Research Institute、^[3]東京理科大学　基礎工学部　Faculty of Industrial Science and Technology, Tokyo University of Science

Abstract: Inorganic glasses normally exhibit a network of interconnected covalent-bonded structural elements that has no long-range order. In silicate glasses the network formers are based on SiO₄-tetrahedra of which the interconnectivity is realized by sharing the oxygen atoms at the corners. Conventional wisdom then implies that alkaline and alkaline-earth orthosilicate materials cannot be vitrified because they do not contain sufficient network forming SiO₂ to establish the needed interconnectivity. We have studied a bulk magnesium orthosilicate glass obtained by levitation melting- and-cooling. We find that the role of network former is largely taken on by corner- and edge-sharing ionic magnesium species that adopt 4-, 5- and 6-coordination with oxygen.

Pages 200 - 202 Download PDF (83.89 KB)

2000Bに採択され2003Aに終了した長期利用課題の研究紹介（1）
Outline of Long-term Proposals (2000B-2003A)

（財）高輝度光科学研究センター　利用業務部　User Administration Division, JASRI

Page 203 Download PDF (566.50 KB)

超臨界金属流体の構造研究
隠されていたもうひとつのゆらぎ−
Another Fluctuation in Supercritical Fluid Metals

田村　剛三郎　TAMURA Kozaburo

京都大学　工学研究科　Graduate School of Engineering, Kyoto University

Pages 203 - 213 Download PDF (566.50 KB)

放射光核共鳴散乱による元素およびサイトを特定した局所振動状態密度の研究
Study on Element-and Site-Specific Vibrational Densities of States Using Nuclear Resonant Inelastic Scattering

瀬戸　誠　SETO Makoto

京都大学　原子炉実験所　Research Reactor Institute, Kyoto University

Pages 214 - 222 Download PDF (215.55 KB)