sir, what is the fundamental mistake in considering r^{+} =0.732r^{-}?
what will happen if r^{+}r^{-}=0.732(just less than)
then what is the implication of saying if 0.414 â‰¤r/R â‰¤0.732, it is an octahedral void?
A^{+} is in the octahedral void of X^{-}.
2r^{+}+2r^{-}=2âˆš2r^{-}
r^{+}=(âˆš2-1)r^{-}=0.414*250=103.5â‰ˆ104 pm
sir, what is the fundamental mistake in considering r^{+} =0.732r^{-}?
what will happen if r^{+}r^{-}=0.732(just less than)
then what is the implication of saying if 0.414 â‰¤r/R â‰¤0.732, it is an octahedral void?
then there is a concept of tightly fit and loosely fit.
when r/R=0.414 it is tightly fit.
as we go on increasing the ratio, it becomes loose
and after 0.732 it is so loose that it changes to BCC
So sir if not mentioned, we always take it to be tightly fit?
=> R(+) / R(-) = .414
=> R(+) + R(-) = âˆš2(R-)
=> R(+) = R(-)*(.414)
=> R(+) = 250 * .414
=> R(+) = 104(approx.)
Therefore (A) is the answer