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Physical Chemistry

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Joined:	27 Feb 2008
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7 Aug 2008 00:32:36 IST

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questions of the week!!

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Q 1) prove that void space in the flourite structure per unit volume of unit cell is 0.243?

Q 2) a strong current of trivalent gaseous boron passed through a germanium crystal decreases the density of the crystal due to part of Ge by Boron and due to interstitial vacancies created by missing Ge atoms in one such experiment , one gram Ge is taken and BORON atoms are found to be 150 ppm by weight , when the density of the Ge crystal decrease by 4% . calculate the % of missing vacancies due to ge which are filled up by BORON atoms?

at wt of ge 72.6 and boron is 10.811

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SHAILESH

Blazing goIITian

Joined: 19 Nov 2007

Posts: 375

7 Aug 2008 10:35:30 IST

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sir i m very very sorry i haven't done solid state , thank u so much sir that simply on 1 request u did this for me
im really very sorry that i couldn,t attempt this one , sir im feeling giulty but couldn't help myself
again thanking

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