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  2. Spinel group - Wikipedia

    en.wikipedia.org/wiki/Spinel_group

    Inverse spinel structures have a different cation distribution in that all of the A cations and half of the B cations occupy octahedral sites, while the other half of the B cations occupy tetrahedral sites. An example of an inverse spinel is Fe 3 O 4, if the Fe 2+ (A 2+) ions are d 6 high-spin and the Fe 3+ (B 3+) ions are d 5 high-spin.

  3. Maghemite - Wikipedia

    en.wikipedia.org/wiki/Maghemite

    Cation distribution [ edit ] There is experimental [ 8 ] and theoretical [ 9 ] evidence that Fe(III) cations and vacancies tend to be ordered in the octahedral sites, in a way that maximizes the homogeneity of the distribution and therefore minimizes the electrostatic energy of the crystal .

  4. Cadmoindite - Wikipedia

    en.wikipedia.org/wiki/Cadmoindite

    CdIn 2 S 4 exhibits the spinel structure, which can be described by a cubic unit cell with 8 tetrahedrally coordinated and 16 tetrahedrally coordinated cation sites. The distribution of Cd(II) and In(III) over the cation sites is difficult to elucidate from standard X-ray diffraction techniques because the two species are isoelectronic, but both Raman spectroscopy measurements on synthetic ...

  5. Spinel - Wikipedia

    en.wikipedia.org/wiki/Spinel

    Polyhedral representation of spinel MgAl 2 O 4. Spinel (/ s p ɪ ˈ n ɛ l, ˈ s p ɪ n əl / [7]) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2 O 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5]

  6. Ceylonite - Wikipedia

    en.wikipedia.org/wiki/Ceylonite

    The mineral ceylonite has the chemical composition of (Mg, Fe 2+) Al 2 O 4, putting it into a group of minerals known as the spinel group, or the oxide spinels. The oxide spinels have a formula of the model [A][B] 2 O 4; where [A] is commonly Fe 2+, Mg 2+, or Mn 2+, and [B] is Fe 3+, Al 3+, or Cr 3+. It is an iron-rich variety of the spinel ...

  7. Channelrhodopsin - Wikipedia

    en.wikipedia.org/wiki/Channelrhodopsin

    The blue-light sensitive ChR2 and the yellow light-activated chloride pump halorhodopsin together enable multiple-color optical activation and silencing of neural activity. [ 64 ] [ 65 ] Another interesting pair is the blue-light sensitive chloride channel Gt ACR2 [ 66 ] and the red-light sensitive cation channel Chrimson [ 67 ] which have been ...

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  9. TRPV1 - Wikipedia

    en.wikipedia.org/wiki/TRPV1

    TRPV1 is an element of or mechanism used by the mammalian somatosensory system. [12] It is a nonselective cation channel that may be activated by a wide variety of exogenous and endogenous physical and chemical stimuli.

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