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  2. Surface reconstruction - Wikipedia

    en.wikipedia.org/wiki/Surface_reconstruction

    The Si (111) structure, by comparison, exhibits a much more complex reconstruction. Cleavage along the (111) surface at low temperatures results in another 2×1 reconstruction, differing from the (100) surface by forming long π-bonded chains in the first and second surface layers. However, when heated above 400 °C, this structure converts ...

  3. Clay mineral X-ray diffraction - Wikipedia

    en.wikipedia.org/wiki/Clay_Mineral_X-Ray_Diffraction

    Typically, powder X-ray diffraction (XRD) is an average of randomly oriented microcrystals that should equally represent all crystal orientation if a large enough sample is present. X-rays are directed at the sample while slowly rotated that produce a diffraction pattern that shows intensity of x-rays collected at different angles. Randomly ...

  4. X-ray fluorescence - Wikipedia

    en.wikipedia.org/wiki/X-ray_fluorescence

    X-ray diffraction (XRD) is still the most used method for structural analysis of chemical compounds. Yet, with increasing detail on the relation of K β {\displaystyle K_{\beta }} -line spectra and the surrounding chemical environment of the ionized metal atom, measurements of the so-called valence-to-core (V2C) energy region become ...

  5. Silicon tetrafluoride - Wikipedia

    en.wikipedia.org/wiki/Silicon_tetrafluoride

    Silicon tetrafluoride or tetrafluorosilane is a chemical compound with the formula Si F 4.This colorless gas is notable for having a narrow liquid range: its boiling point is only 4 °C above its melting point.

  6. Silicon disulfide - Wikipedia

    en.wikipedia.org/wiki/Silicon_disulfide

    Silicon disulfide is the inorganic compound with the formula Si S 2. Like silicon dioxide , this material is polymeric , but it adopts a 1-dimensional structure quite different from the usual forms of SiO 2 .

  7. XRD - Wikipedia

    en.wikipedia.org/wiki/XRD

    XRD may refer to: X-ray diffraction , used to study the structure, composition, and physical properties of materials Extensible Resource Descriptor , an XML format for discovery of metadata about a web resource

  8. Gallium(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Gallium(III)_oxide

    Gallium(III) oxide is an inorganic compound and ultra-wide-bandgap semiconductor with the formula Ga 2 O 3. It is actively studied for applications in power electronics, phosphors, and gas sensing. [5] [6] [7] The compound has several polymorphs, of which the monoclinic β-phase is the most stable.

  9. Bismuth (III) sulfide - Wikipedia

    en.wikipedia.org/wiki/Bismuth(III)_sulfide

    Bismuth(III) sulfide can be prepared by reacting a bismuth(III) salt with hydrogen sulfide: 2 Bi 3+ + 3 H 2 S → Bi 2 S 3 + 6 H + Bismuth (III) sulfide can also be prepared by the reaction of elemental bismuth and elemental sulfur in an evacuated silica tube at 500 °C for 96 hours. 2 Bi + 3 S → Bi 2 S 3

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