ペロブスキート後のMgSiO3の滑り系:D'アニソトロピーの影響
Lowell Miyagi1, Waruntorn Kanitpanyacharoen, Pamela Kaercher
1Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA.
Science (New York, N.Y.)
|October 9, 2010
まとめ
MgSiO(3) は, (001) 面でのペロブスキート転落後,地球の下層マントルの地震性アニソトロピーを強化する. これにより,D'層における変形メカニズムと地震の解釈が明確になります.
科学分野:
- ミネラル物理学 ミネラル物理学
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
背景:
- 最下層マントルの鉱物相の変形は,地震性アニソトロピーの解釈に極めて重要です.
- MgSiO ((3)) のペロブスキート後の変形による滑りについて論争がある.
研究 の 目的:
- 高圧下でのペロブスキート後のMgSiO ((3) の変形機構と好ましい方向性を調査する.
- 地球のD''領域における地震性アニソトロピーの生成におけるスリップの役割を明確にするために.
主な方法:
- 地球の下層マントルの条件をシミュレートする高圧実験.
- 格子平面の向きと好みの向きの進化を観察するためのX線 difraktion.
- 実験結果に基づく変形とアニソトロピーのモデリング.
主要な成果:
- MgSiO(3) ポストペロブスキット (001) 格子平面の方向性を高角度から圧縮ポスト変換に示します.
- 偏向の強度は,圧縮で148 GPaから185 GPaに大幅に増加し, (001) スリップを示します.
- 結果は,以前の研究と対照的に,単に相変換ではなく,偏った方向性を変形に代入します.
結論:
- (001) 格子平面の滑り方は,下層マントルの条件下で,MgSiO ((3)) のペロブスキート後の変形のための重要なメカニズムです.
- この発見は,地震性アニソトロピーの解釈,特にD'領域におけるシーザー波分裂の解釈を支持する.
- この研究は,鉱物の行動と地球の深い内部における地震波の伝播に関する私たちの理解を洗練します.
さらに関連する動画
関連する概念動画
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
02:52Stereoisomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
01:29Crystallographic Point Groups
Crystallographic point groups represent the various symmetry operations that can occur within crystals. They are unique in that at least one point will always remain unchanged during these actions. For instance, consider the triclinic system. This system, devoid of any axis or plane of symmetry, aligns with the C1 and Ci point groups.where Cᵢ is characterized solely by a center of inversion.Contrastingly, the monoclinic system introduces an element of symmetry. This system with one plane and...
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
01:29Imperfections in Crystal Structure: Non-Stoichiometric Defects
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...