関連する実験動画
Updated: Jul 11, 2026
11:32
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
B1-b2 衝撃波とダイヤモンド細胞実験から酸化カルシウムへの移行
Science (New York, N.Y.)
|November 16, 1979
まとめ
酸化カルシウムは高圧下では構造変化を起こし,衝撃波とダイヤモンド細胞実験で確認されました. この発見は,地球に関する理論を裏付けている.
科学分野:
- 地質物理学と高圧物理.
背景:
- 酸化カルシウム (CaO) は,惑星の内部における重要な成分である.
- その高圧の振る舞いを理解することは,地球のマントルのモデルにとって極めて重要です.
研究 の 目的:
- 極端な圧力下での酸化カルシウムの構造的相変化を調査する.
- 高圧測定スケールを検証するために.
主な方法:
- 衝撃波実験を用いて,高圧下での材料の性質を調査する.
- 静的な高圧測定のためにダイヤモンド・アンビル・セル・テクニックを使用しています.
- ルビー光を用いた圧力スケールのクロス検証.
主要な成果:
- カルシウム酸化物のB1構造からB2構造への相変化が60〜70GPaの間で観察されました.
- この移行期間中に11%の量減少を記録した.
- ルービーの光圧縮尺度が65GPaまで正確であることを確認しました.
結論:
- CaOにおけるB1-B2の移行は,下層マントルの組成に関する洞察を提供します.
- この結果は,惑星形成における不均質な増殖の理論を裏付けている.
さらに関連する動画
関連する概念動画
02:41Constant Volume Calorimetry
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
02:18X-ray Crystallography
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
01:29Determination of Crystal Structures
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...