• Zigya Logo

    The Solid State
    pdf download
    What is the arrangement of Zn2+ and S2– ions in Zinc blende (ZnS) crystal structure?
    Zinc sulfide crystallizes in a Face-Centered Cubic unit cell (FCC) having an edge length of 5.409 Angstroms
    Sulfide anions have FOUR neighbors of opposite charge arranged at vertices of a tetrahedron. Zinc cations also have FOUR neighbors of opposite charge arrange at vertices of a tetrahedron. So the Zn : S coordination ratio is 4 : 4 or 1 : 1.
    326 Views
    Answer
    Advertisement
    Zigya App

    Why FeO is non-stoichiometric with the formula Fe0.95 O explain?

    The non-stoichiometry reflect the ease of oxidation of Fe2+ to Fe3+ effectively replacing a small portion of Fe2+ with two thirds their number of Fe3+. Thus for every three "missing" Fe2+ ions, the crystal contains two Fe3+ ions to balance the charge .   i.e. 3Fe2+ = 2Fe3+ to maintain electrical neutrality
    1950 Views
  • Switch
    • Advertisement
    Define non-stiochiometry defect in crystals?
    Those defect which lead to change in composition of solids are called non-stoichiometric defects.They are most often inorganic compounds, and almost always solids They contain constituting particles in non-stoichiometric ratio, e.g., Fe0.93 O1.0, Ni0.94 O1.0 are examples of non-stochiometric compounds.
    196 Views
    Answer
    How many Na+ ions occupy second nearest neighbour locations of a Na+ ion in the structure of sodium chloride crystals?
     The second nearest Co-ordination number of Na+ ions is 12.
    334 Views
    Answer
    explain the effect of Frenkel structural defect on the electrical conductance of a crystalline solid?
    Frenkel Defect: This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site . It creates a vacancy defect at its original site and an interstitial defect at its new location. this vacancy defect increase the Electrical conductance.
    163 Views
    Answer
    Advertisement
    Flag Popup Icon
    Flag it
    Submit
    Flag Popup Icon
    Switch to
  • Type
  • Category
    • flexipad
    Share It Icon
    Share it
    Share It
    Share it