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関連する概念動画

The Sulfur Cycle01:22

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Minerals01:26

Minerals

Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.

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関連する実験動画

Updated: May 12, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

地球の中心にあるシリコン.

R Bastian Georg1, Alex N Halliday, Edwin A Schauble

  • 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3PR, UK.

Nature
|June 29, 2007
PubMed
まとめ

惑星のシリケート岩は,明確なシリコン同位体差異を示しています. これらの変異は,シリコンが月が形成される前に地球の核に組み込まれ,蒸発理論に挑戦していたことを示唆しています.

科学分野:

  • * 惑星科学 (惑星科学)
  • *地化学について
  • * 宇宙化学について

背景:

  • *惑星のシリケート鉱物における同位体変動は,核形成または蓄積中の蒸発的損失から生じる可能性があります.
  • * 地球と月の塩基岩からの鉄同位体データは,火星,ヴェスタ,コンドライトからのより重く,月形成の巨大衝突時の蒸発が提案された原因である.
  • *リチウムやマグネシウムのような軽くて揮発性のある元素は,そのような同位体差異を示せず,蒸発仮説に疑問を投げかけます.

研究 の 目的:

  • *地球と月の玄武岩のシリコン同位体組成を調べる.
  • * シリコンの同位体変動が核形成プロセスで説明できるかどうかを判断する.
  • * 巨大衝突の仮説と地球の中核の構成への影響を評価する.

主な方法:

  • *地球と月からの玄武岩のサンプルにおけるシリコン同位体組成の分析.
  • *観測されたシリコンイソトープデータと,コア形成と結合硬さの理論モデルを比較した結果.
  • *新しいシリコン同位体発見に照らして巨大衝突仮説の評価.

主要な成果:

  • *地球と月の塩基岩は,はっきりと重量のシリコン同位体成分を示しています.
  • *観測されたシリコン同位体効果は,地球の核における軽い元素としてのシリコンに関する理論的予測と一致しています.

さらに関連する動画

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
11:50

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

Fabrication and Optimization of Type II Silicon Clathrate Films
06:53

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

関連する実験動画

Last Updated: May 12, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
11:50

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

Fabrication and Optimization of Type II Silicon Clathrate Films
06:53

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

  • * 大量のシリケート物質である地球と月は,似たようなシリコン同位体成分を共有しており,巨大衝突時の大規模な均衡を支えている.

    • 結論:

    • * シリコンは,月が形成される前に,光の元素として地球の核に組み込まれていた可能性が高い.
    • * 蒸発ではなく,核形成プロセスが,観測されたシリコン同位体分断の起因であると考えられる.
    • *この発見は巨大衝突の仮説を裏付け,陸上の惑星の初期の分化についての洞察を提供します.