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相关概念视频

Determination of Crystal Structures01:29

Determination 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...
X-ray Crystallography02:18

X-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...

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相关实验视频

Updated: Jul 12, 2026

High Pressure Single Crystal Diffraction at PX^2
11:32

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

高压多态图:一个X射线衍射研究.

L G Liu, W A Bassett, M S Liu

    Science (New York, N.Y.)
    |April 20, 1973
    PubMed
    概括

    图在高压下转化为类型的结构,类似于其他稀土元素. 独特的是,图是唯一的.

    科学领域:

    • 材料科学 材料科学 材料科学
    • 凝聚物质物理学 凝聚物质物理学
    • 晶体学 晶体学是指结晶学.

    背景情况:

    • 稀土元素在压力下表现出多样化的结构相变.
    • 了解这些转变对于材料科学和凝聚物质物理学至关重要.

    研究的目的:

    • 为了研究图在高压下的结构性行为.
    • 为了比较的相变与其他稀土元素.

    主要方法:

    • 进行X射线衍射研究.
    • 使用钻石压机进行高压应用.
    • 在室温下分析结构变化.

    主要成果:

    • 图从六角密封 (HCP) 结构转变为萨马里亚类型结构.
    • 的轴比 (c/a) 是压力独立的.
    • 过渡是可逆的,发生在60-116千巴之间.

    结论:

    • 图的相位过渡类似于其他稀土元素,但具有独特的压力独立的轴比行为.
    • 观察到的可逆性和明显的轴比属性为稀土元素物理学提供了洞察力.

    更多相关视频

    Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
    11:54

    Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

    Published on: February 8, 2018

    Synthesis and Microdiffraction at Extreme Pressures and Temperatures
    07:26

    Synthesis and Microdiffraction at Extreme Pressures and Temperatures

    Published on: October 7, 2013

    相关实验视频

    Last Updated: Jul 12, 2026

    High Pressure Single Crystal Diffraction at PX^2
    11:32

    High Pressure Single Crystal Diffraction at PX^2

    Published on: January 16, 2017

    Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
    11:54

    Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

    Published on: February 8, 2018

    Synthesis and Microdiffraction at Extreme Pressures and Temperatures
    07:26

    Synthesis and Microdiffraction at Extreme Pressures and Temperatures

    Published on: October 7, 2013

  • 在116 kbar时确定了samarium类型阶段的格子参数.