高圧でのフェロペリクラゼにおけるスピンクロスオーバー:地震学的に透明な移行?
Daniele Antonangeli1, Julien Siebert, Chantel M Aracne
1Institut de Minéralogie et de Physique des Milieux Condensés, UMR CNRS 7590, Institut de Physique du Globe de Paris, Université Pierre et Marie Curie, Université Paris Diderot, 75005 Paris, France. daniele.antonangeli@impmc.upmc.fr
まとめ
地下マントルの鉄のスピン移行は,シーアモジュリに影響するが,総地震速度は影響しない. これは地震シグネチャーの欠如を説明しますが,それはシーア波アニソトロピーに影響します.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- ミネラル物理学 ミネラル物理学
- 地震学 地震学とは
背景:
- 地球のマントルの地震の不連続は,温度,化学,または構造の変化と関連しています.
- 下層マントルの鉄のスピン状態の移行は,地震波の速度を変更する可能性がありますが,直接的な証拠は不足しています.
研究 の 目的:
- フェロペリカラーゼにおける圧力誘発の鉄回転変異の地震学的影響を調査する.
- スピンの移行が下部マントルで検出可能な地震異常を生むかどうかを判断する.
主な方法:
- (Mg{0.83) Fe{0.17)) O-ferropericlase.に不弾性X線散射実験を行った.
- 鉄のスピン移行の圧力範囲全体で測定が行われました.
主要な成果:
- 鉄のスピン移行は主に弾性テンソールの剪定モジュールに影響します.
- 総地震速度の有意な偏差は観察されず,1D地震シグネチャーの欠如を説明しています.
- スピンの移行は,フェロペリカラーゼ.フェロペリカラーゼのシーアアニソトロピーに影響することが判明しました.
結論:
- 下層マントルの圧力誘発の鉄のスピン移行は,総地震速度の検出可能な異常を生成しません.
- スピンの移行は,下層マントルで観測される地震シーア波アニソトロピーに寄与する.
関連する概念動画
Phase Transitions
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
Phase Transitions
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Magnetic Susceptibility and Permeability
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Phase Transitions: Sublimation and Deposition
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...


