Formation of Interstitial Compounds and Alloy Formation Video Lecture - JEE

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d-block elements we talked about the
interstitial compound so what an
interstitial compound I think we've
studied about this interstitial
component see interstitial compounds are
those compounds which are form and small
atoms like hydrogen carbon all these are
smaller atoms these more atoms are
trapped somewhere here so if we see
small atoms here for example this places
these are smaller than sometimes they
are trapped this is the energy of
crystal it can be any crystal so this
let suppose there is a crystal of metals
and in this crystal these small small
icons are top okay now since these
metals are just tab there is no actual
morning so they are usually non
stoichiometric okay once again it's in
there this trap and there is no bond so
they are generally non stoichiometric
example T I H 1.7 that is for every one
titanium you have 1.7 hydrogen they just
trapped okay
and these non-stem in non stoichiometric
compound if you want to define they are
a chemical compound that can't be
represented by a ratio of well-defined
national number for example co2 25
national number this tih 1 points and
not a well-defined
rational number these are non geometric
a pound right typically in this case
small molecules are trapped and they are
taught in any ratio they're not they
don't have proper bond okay but they
have different properties this
interstitial compound they have high
melting point and boiling point then the
dr. your metals a very hard very hard
they have the hardness similar to
diamond also they are chemically inert
chemically they are inert and this
metalic conductivity is retained and but
their ductility
TVT and many ability is reduced
it is reduced see this is my structure
we have discussed these structures in
the past which are cross so here some of
the small small one huge by
carbon-nitrogen attract okay if you want
to give visualize in this fashion so
they are trap the whole formula changes
and it's all non stuck metric you can
also say this is a non struck mental
defects also the next is alloy formation
see a live our mission is almost similar
as the interstitial compound but here we
have the mutual substitution of atoms so
here if let's suppose one atom is the
place actually so you want to introduce
one one has to go out okay so since now
there is a difference see in case of
interstitial views using small items
like written nitrogen right so hydrogen
this is small so on earth on this we're
occupying this the extra space here
extra space here that was interstitial
come on but in this case of a life
formation we are saying if I am
introducing your atom one atom has to
replace that means the new item should
be of comparable size like it should
also be the comparable size example this
red one it can actually replace this
gray one okay so these this is the new
atom and that's what we do
should we talk about definition of Allah
Allah is nothing but the blend of metals
prepared by mixing various metals and
they are a homogeneous solid solution in
which atoms of one metal is actually
distributed randomly across the metal
across the atom across the Metro example
copper ng copper and zinc the size is
almost same so copper can replace
jingle in the lattice okay so there is a
I mean you just conform alloy for any
two metal or any two element the size of
the atom should match you can't form
I have copper and hydrogen not possible
but you can form I love copper and zinc
that's why you see when you've talked
about alloy you talk about alloys of
typically methods of similar size okay
so plus minus 15% is okay but yeah
that's what the reigning you looking for
example this is 100 Pico meter it can be
100 or 85 215 Pico meter I'm just taking
two elements X&Y
that should be the range okay and these
alloys are formed by the atoms with
metallic radius that is almost 15
centimeter of each other the way I
explained the stop okay now if you see
in transition metal we have seen that
this metals have similar radius copper
Qing they have similar radius since they
have similar it here you can form a lot
with them easily because see your alloy
information the main cache here is
similar radius it because you have to
the new at down to replace the existing
atom so it should fit because this is
already let us here right if you want to
remove this red ball with one more ball
here so this ball should actually fit in
this place right to this ball should be
plus minus 15 percent of this ball
alright and this feature is there in
turn the sheet metal most of the metals
they have one more symbol atomic size
since they have similar atomic size they
are fit to form alloy by mutual
substitution for example brass grass is
made from copper and zinc groans groans
is made from copper and tin and these
allows have different property all
together and they have huge industry
application we have seen the brass and
bronze has been quietly used in the
industries and because they have the few
properties so now with this let us do up
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