高圧および高温下でのチンのX線 difrraction研究
Science (New York, N.Y.)
|September 13, 1963
まとめ
亜鉛は高圧 (39kB) と高温 (314°C) で四角対称性を示す. 研究者らは,X線 difraktion を使って,70kbまで,tin Iとtin IIの相境界をマッピングしました.
科学分野:
- 材料科学 材料科学とは
- 固体物理 固体物理学
- クリスタログラフィーです.
背景:
- 亜鉛は,異なる圧力と温度条件下で相変化を経験します.
- 亜鉛相の結晶構造を理解することは,材料科学の応用において極めて重要です.
研究 の 目的:
- 高圧および高温下でのチンの結晶構造を決定する.
- の融解曲線と相境界を調べるため.
- タンIとタンIIのフェーズ移行を特徴づけるために.
主な方法:
- 亜鉛の構造を分析するために,X線 difrraction技術が採用されました.
- 70キロバー (kb) までの高圧実験が行われました.
- 構造分析の際に温度を314°Cで制御した.
主要な成果:
- チンは39kbと314°Cで四角対称性を有することが観察されました.
- ユニットセル寸法が決定されました:a = 3.81 Å,c = 3.48 Å,c/a = 0.91.
- 融解曲線は45kbまで観測され,亜鉛I-亜鉛II相境界は70kbまでマッピングされた.
結論:
- この研究は,特定の高圧条件下でのチンの正確な結晶学的データを提供します.
- 亜鉛の相図が拡張され,亜鉛Iと亜鉛II相の境界が明確になりました.
- これらの発見は,極端な環境でのチンの行動の理解に貢献します.
関連する概念動画
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...
01:10X-ray Diffraction of Biological Samples
X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
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...