Results 1 to 6 of 6

Thread: Is there a word for the substance that comprises Earth's mantle?

  1. #1
    Join Date
    Nov 2004
    Posts
    5,693

    Is there a word for the substance that comprises Earth's mantle?

    I'd always assumed it was "magma" but apparently magma is just lava underground. Is there a word for the superheated rheid of olivine and pyroxine that comprises most of the substance of our planet?
    "Occam" is the name of the alien race that will enslave us all eventually. And they've got razors for hands. I don't know if that's true but it seems like the simplest answer."

    Stephen Colbert.

  2. #2
    Join Date
    Jul 2005
    Posts
    20,151
    The olivine-pyroxene rheid is just the upper mantle, though. The lower mantle is thought to be primarily perovskite, with an admixture of other stuff, and it's the perovskite that is the most abundant mineral in the Earth.

    Grant Hutchison

  3. #3
    Join Date
    Dec 2011
    Location
    Very near, yet so far away
    Posts
    402
    Quote Originally Posted by grant hutchison View Post
    The olivine-pyroxene rheid is just the upper mantle, though. The lower mantle is thought to be primarily perovskite, with an admixture of other stuff, and it's the perovskite that is the most abundant mineral in the Earth.

    Grant Hutchison
    I read a report today which mentions perovskite as a wonder material for making solar panels more efficient. I knew I had heard the name before recently and so here I am.


    "Solar power world record set with ‘miracle material’ perovskite" | The Independent

    https://www.independent.co.uk/life-s...-b1774312.html

  4. #4
    Join Date
    Sep 2003
    Location
    The beautiful north coast (Ohio)
    Posts
    50,302
    Quote Originally Posted by headrush View Post
    I read a report today which mentions perovskite as a wonder material for making solar panels more efficient. I knew I had heard the name before recently and so here I am.


    "Solar power world record set with ‘miracle material’ perovskite" | The Independent

    https://www.independent.co.uk/life-s...-b1774312.html
    Perovskite the mineral has a nominal formulation of CaTiO3. However, any crystalline material that has the same structure as that mineral (see image) is known as a perovskite. The generic formula for all of these are ABX3, where A and B are generally metallic elements, and X is a non-metal, such as oxygen or one of the halides. But not only does a perovskite have the formulation, but it also has to have the same structure.



    The perovskites in the mantle are believed to be primarily silicates, with compositions such as (Mg,Fe)SiO3 and CaSiO3 (the (Mg,Fe) means that you have can have mixtures of Mg and Fe, which together add up to 1).

    The perovskite being used for solar cells also have the same structure, but are very different materials. They are halides, and one of the cations is a large, organic cation. (CH3NH3)PbX3 is one of the most studied (LINK).

    On a personal note, both my undergraduate advisor (Ephraim Banks) and my graduate advisor (Aaron Wold) did a lot of work on perovskites (link to one of their papers).
    At night the stars put on a show for free (Carole King)

    All moderation in purple - The rules

  5. #5
    Join Date
    Dec 2011
    Location
    Very near, yet so far away
    Posts
    402
    Interesting, thanks Swift.

  6. #6
    Join Date
    Feb 2005
    Posts
    12,104
    I think it is also going to be used in a gamma ray detector, as per Space Daily

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •