Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Distance to 3rd and 5th nearest ion to S2- in ZnS structure

  1. Oct 13, 2018 #1
    • Please post this type of questions in the HW section using the template and showing your work.
    Hey folks

    ZnS has a ccp structure with S2- ions forming FCC lattice with Zn2+ ions at half the tetrahedral voids


    Attached is a table showing no. of nearest neighbours and their distance for an S2- ion

    'a' is edge length of the unit cell

    I want to know how the distance to the 3rd & 5th nearest ion is √11a/4 & √19a/11, i.e how to prove this.


    Thanks ... any help is appreciated
  2. jcsd
  3. Oct 14, 2018 #2


    User Avatar

    Staff: Mentor

    Have you you tried to follow the geometry? Often it is enough to find right right triangles and use Pythagorean theorem.
  4. Oct 15, 2018 #3


    User Avatar
    Science Advisor

    I think those numbers are wrong. They're not what I get (with quick mental arithmetic).
  5. Oct 30, 2018 #4
    yes i did pythogarus & got it ... thanks ...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?