関連する実験動画

Updated: Jul 10, 2026

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

月面岩の結晶化研究:合成アルマルコライトの結晶構造

M D Lind, R M Housley

    Science (New York, N.Y.)
    |February 4, 1972
    PubMed
    まとめ

    研究者は,月の岩からアーマルコライトの結晶を育て,特定のカチオン配列を発見しました. アーマルコライト,カロライト,シドブロキイトで観察されたこの順序は,以前の構造的仮定に異議を唱える.

    さらに関連する動画

    Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples10:12

    Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

    Published on: June 19, 2018

    Atom Probe Tomography Analysis of Exsolved Mineral Phases08:14

    Atom Probe Tomography Analysis of Exsolved Mineral Phases

    Published on: October 25, 2019

    関連する概念動画

    Structures of Solids02:22

    Structures of Solids

    Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
    Ionic Crystal Structures02:42

    Ionic Crystal Structures

    Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
    Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
    Crystal Density01:19

    Crystal Density

    The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
    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...
    Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

    Imperfections in Crystal Structure: Point, Line and Plane Defects

    A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
    Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

    Imperfections in Crystal Structure: Stoichiometric Point Defects

    Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...