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  2. Colloidal crystal - Wikipedia

    en.wikipedia.org/wiki/Colloidal_crystal

    A colloidal crystal is an ordered array of colloidal particles and fine grained materials analogous to a standard crystal whose repeating subunits are atoms or molecules. [1] A natural example of this phenomenon can be found in the gem opal , where spheres of silica assume a close-packed locally periodic structure under moderate compression .

  3. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can also be used as a casting resin, in inks and coatings, and for many ...

  4. Plastic crystal - Wikipedia

    en.wikipedia.org/wiki/Plastic_crystal

    true crystal → liquid crystal → true liquid. The difference between liquid and plastic crystals is easily observed in X-ray diffraction. Plastic crystals possess strong long range order and therefore show sharp Bragg reflections. [1] Liquid crystals show none or very broad Bragg peaks because the order is not long range.

  5. Lutetium–yttrium oxyorthosilicate - Wikipedia

    en.wikipedia.org/wiki/Lutetium–yttrium...

    Lutetium–yttrium oxyorthosilicate, also known as LYSO, is an inorganic chemical compound with main use as a scintillator crystal for gamma radiation detection. [4] Its chemical formula is Lu 2(1-x) Y 2x SiO 5. The percentage of yttrium varies considerably, with values in the literature ranging from 5% to 70%. [5]

  6. List of piezoelectric materials - Wikipedia

    en.wikipedia.org/wiki/List_of_piezoelectric...

    BaTiO 3 single crystals [111] neutral (domain size of 60 ľm) d 33 = 241 ε 33 = 1959 k 33 = 55.9 Zgonik et al. 1994 [12] BaTiO 3 single crystals [111] (domain size of 22 ľm) d 33 = 256 ε 33 = 2008 k 33 = 64.7 Zgonik et al. 1994 [12] BaTiO 3 single crystals [111] neutral (domain size of 15 ľm) d 33 = 274 ε 33 = 2853 k 33 = 66.1 Zgonik et al ...

  7. Porphyroblast - Wikipedia

    en.wikipedia.org/wiki/Porphyroblast

    A similar type of crystal is a phenocryst, a large crystal in an igneous rock. Porphyroblasts are often confused with porphyroclasts, which can also be large outstanding crystals, but which are older than the matrix of the rock [citation needed].

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