高圧力の科学と技術
Online ISSN : 1348-1940
Print ISSN : 0917-639X
ISSN-L : 0917-639X
特集:高圧下における中性子散乱実験の実際と展望
パルス中性子粉末回折による地球マントル高密度含水相の水素配置解析
奥地 拓生富岡 尚敬プレジャブ ナランゴー
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2016 年 26 巻 2 号 p. 140-148

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Deuterium site positions and occupancies in the crystal structures of synthetic hydrous ringwoodite [γ-(Mg1.72Fe0.17D0.22)(Si0.97D0.12)O4] and dense hydrous magnesium silicate (DHMS) phase E [Mg2.28Si1.31O6D2.22] have been determined for the first time by high-resolution time-of-flight (TOF) neutron powder diffraction conducted at Japan Proton Accelerator Research Complex (J-PARC). These two minerals are the promised major careers of deep-mantle water. They were synthesized at pressures up to 19 GPa and at temperatures up to 1300℃ using a Kawai-type apparatus, for which we have newly designed two types of furnace assemblies to uniformly heat large masses of samples at these pressures (45 to 80 mg for each experimental run). The products were chemically uniform and free from any contamination of 1H. We successfully refined the structures of the two minerals to find the relations between their chemical bonding states and their physical properties.

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© 2016 日本高圧力学会
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