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  2. Varistor - Wikipedia

    en.wikipedia.org/wiki/Varistor

    The development of the varistor, in form of a new type of rectifier based on a cuprous oxide (Cu 2 O) layer on copper, originated in the work by L.O. Grondahl and P.H. Geiger in 1927. [3] The copper-oxide varistor exhibited a varying resistance in dependence on the polarity and magnitude of applied voltage. [4]

  3. Copper(II) oxide - Wikipedia

    en.wikipedia.org/wiki/Copper(II)_oxide

    Copper(II) oxide or cupric oxide is an inorganic compound with the formula CuO. A black solid, it is one of the two stable oxides of copper, the other being Cu 2 O or copper(I) oxide (cuprous oxide). As a mineral, it is known as tenorite, or sometimes black copper.

  4. Tenorite - Wikipedia

    en.wikipedia.org/wiki/Tenorite

    Tenorite, sometimes also called Black Copper, is a copper oxide mineral with the chemical formula CuO. The chemical name is Copper(II) oxide or cupric oxide. Occurrence

  5. Copper oxide - Wikipedia

    en.wikipedia.org/wiki/Copper_oxide

    Copper oxide is any of several binary compounds composed of the elements copper and oxygen. Two oxides are well known, Cu 2 O and CuO, corresponding to the minerals cuprite and tenorite, respectively. Paramelaconite (Cu 4 O 3) is less well characterized. [1] Copper oxide may refer to: Copper(I) oxide (cuprous oxide, Cu 2 O) Copper(II) oxide ...

  6. Copper compounds - Wikipedia

    en.wikipedia.org/wiki/Copper_compounds

    Yttrium barium copper oxide (YBa 2 Cu 3 O 7) consists of both Cu(II) and Cu(III) centres. Like oxide, fluoride is a highly basic anion [19] and is known to stabilize metal ions in high oxidation states. Both copper(III) and even copper(IV) fluorides are known, K 3 CuF 6 and Cs 2 CuF 6, respectively. [1]

  7. Copper(I) oxide - Wikipedia

    en.wikipedia.org/wiki/Copper(I)_oxide

    Copper(I) oxide or cuprous oxide is the inorganic compound with the formula Cu 2 O. It is one of the principal oxides of copper, the other being copper(II) oxide or cupric oxide (CuO).The compound can appear either yellow or red, depending on the size of the particles. [2] Cuprous oxide is found as the mineral cuprite.

  8. Battling fatigue: Why veterans are at risk for hormone imbalance

    www.aol.com/battling-fatigue-why-veterans-risk...

    Army sergeant Victor Estela struggled with a debilitating mental fog when he came home after serving in Iraq. It enveloped his life, leaving him exhausted by simple tasks such as reading or driving.

  9. Rare-earth barium copper oxide - Wikipedia

    en.wikipedia.org/wiki/Rare-earth_barium_copper_oxide

    The most famous ReBCO is yttrium barium copper oxide, YBa 2 Cu 3 O 7−x (or Y123), the first superconductor found with a critical temperature above the boiling point of liquid nitrogen. [10] Its molar ratio is 1 to 2 to 3 for yttrium, barium, and copper and it has a unit cell consisting of subunits, which is the typical structure of perovskites .