1.2 Crystal geometry

[@aboshhh1]

In uni and I’ve gotten so caught up in passing, essentially operating in survival mode I’ve forgotten the beauty of mastery. This reminded me why it’s so important to know your stuff.

[@sonubishwas5300]

Its simply extraordinary what an organised way of teaching

[@KatsKettlebellDojo]

Thank you for sharing these lectures - so interesting and easy to comprehend.

[@introductiontomaterialsscience]

Yes. In all cases where the basis consists of more than one atom all the atoms cannot be at the lattice point. So in NaCl structure you can place Cl at the lattice point. But this will require Na to be placed elsewhere. Even in a single atom basis theoretically it is possible toplace your basis atom away from the lattice. But there is no benefit of such a choice and thus is not done usually.

[@15-manikkamv56]

My question is One atom(basis) can occupy only one lattice point .....I f this is correct then basis explaintion is wrong sir....could you explain sir...

[@pubuduweerakoon7174]

Dear Guruji, Your conceptual approach is logical and therefore appreciable. Regards from Sri Lanka.

[@sujannalbo2699]

simple enough to understand by grade 9 student... what a great way of teaching

[@rohitsurve6220]

Thank you Sir , This will help me in ESE prelims

[@mohammadahmed6604]

Short and crispy chapter ❤ it sir

[@thelugash]

This video was amazing. Thank you so much for publishing these!

[@DheerajKumar-sf5tx]

Extraordinary explanation along with valuable notes. thanks for kindness.

[@owenwilberforce6138]

Thank you for this explanation, it clarifies a very important starting concept which allows the terminology to strengthen understanding of the basics.

[@pubuduweerakoon7174]

Obviously

[@owenwilberforce6138]

@@pubuduweerakoon7174 - Thanks for your insight too, now I now how obvious this all is.

[@mdsolayman9558]

It is really outstanding .. The way of teaching is really amazing. Sir, please keep continuing making videos...

[@vikramkc2219]

Very beautiful explanation, simplest way. Thank you very much sir

[@parmalchouriya738]

Great sir was very informative

[@AXL-115]

the best of best I had seen from organized teaching

[@phasln777]

Thanks a lot sir.. Excellent lesson and very clear to understand.. 🙏

[@rameshram-gc4sm]

Sir nice explanation .plz do.more Videos more

[@udaykumarkondaveeti7698]

Its really amazing very clearly explained. Thank you so much sir [lattice [structure]+ motif [property] = crystal [material] ]

[@rajeshmadipalli3318]

Sir iam searching for crystal for so many days to day i found the actual meaning

[@nitians2536]

Same

[@ivanchua1381]

Thank you, professor.

[@mohammedfaizan3013]

I haven't understood something so clearly in my whole life!!

[@naveenchalapaka]

What a lecture sir super I completely understand thanks❤🌹🌹🌹❤🌹 sir

[@EhenewTesfaye]

Tank you sir 🎉

[@mr.nobody8784]

Plzzz sir make more videos as much as u can bcz its help us

[@ratulsinha7814]

Grt fr starting materials science...

[@soorajm.s9606]

Excellent class...👌

[@rhonrentsops7549]

Pattern of ♥️ hahaha. Smart sir

[@user-kh8ew6ln7t]

Thank you for the lectures!

[@jitendraraul442]

Superb presentation👍🙏🙏.

[@pandyajigar8304]

Thank you sir.... i can easily learn from here......

[@amitkumar3314]

Very nice..

[@simonblue56]

Thank you, sir . Excellent explanations'

[@tushar6525]

Thal you very much for the lecture sir, it's very informative and also very clear to understand.

[@faisal_tarshon]

very simple and clear . Thank you sir

[@user-zo1pw6tt4u]

It's promising that Engineering materials science is simple with your explanations🙏

[@intendraprajapati676]

Sir I learn ur all lectures strictly

[@rasheedak7423]

Super. 👌

[@aliabdlaziz1513]

Crystal concept is crystal clear now sir

[@mahantburman4059]

It's helping me in My AMIE study of Material science

[@mahantburman4059]

At least you are getting the concepts where you'll read the book and will not able to determine the hell is going on

[@purushottamkumar7783]

Plz guide me for amie

[@s.anandhjesuraj5460]

Very Nice introduction sir. Clearly understood.

[@mr.nobody8784]

Thanku sir apki video se meri kafi helf hui h

[@soujanraj6733]

tq u sir.,very useful videos......,

[@Ajrecites]

What a great lecture !!!!❤

[@mohankumar9501]

Thankyou for giving this video thanks

[@TV-rf8hq]

Thank you Professor.!!

[@soumenkarmakar4168]

Great to watch sir!!

[@ajayjaison9756]

U r an awesome teacher

[@please1826]

You have cleared my doubt . Thank you sir

[@introductiontomaterialsscience]

You are most welcome

[@al-hasanmansuri1678]

exceptional loved it

[@learnermarch9361]

Thank you sir you make a hard thing easy ❤️❤️❤️

[@sunder7153]

EXCELLENT!! SIR

[@vijaydeshpande6348]

Great sir, Guru Dronacharya I found.. accept my Namaskaram

[@balamuruganv888]

vijay deshpande idiotic comment

[@BeautyInDifference]

Hello Prof. Rajesh Thank you for beautiful lectures. Why is it necessary to divide Crystal into Lattice and Motif (basis)? Thank you.

[@introductiontomaterialsscience]

It is not necessary. But it aids in understanding.

[@koushikragunatha3368]

It also aids in classification

[@generalI56]

Since Periodic arrangements of atoms may have impact on mechanical/ electrical / chemical properties

[@andrewsa7980]

🔥

[@introductiontomaterialsscience]

Not sure what this icon stand for? :-(

[@andrewsa7980]

@@introductiontomaterialsscience that icon symbolizes that your lecture was very nice and understandable. 🔥 Thank you :)

[@introductiontomaterialsscience]

@@andrewsa7980 That's comforting. I was afraid you disliked it and suggesting 'burn it down" :-)

[@remasen8039]

👍

[@manugupta04]

💥💥💥💥

[@nayandwivedi9120]

Thanks sir

[@mdshahbajansari380]

Sir! What's the difference between crystal and Crystal structure?

[@rajeshprasadlectures]

Crystal is a general term indicating that the atoms are arranged periodically. The phrase ' crystal structure' describes the structure of that crystal in terms of lattice (Bravais lattice) and motif. So we can say that rock salt is a crystal. The crystal structure of rock salt is described by giving it Bravais lattice (FCC) and motif (Cl at 000 and Na at 1/2 1/2 1/2).

[@mdshahbajansari380]

@@rajeshprasadlectures Thank you so much sir for reply!! Now my concept is clear!!

[@generalI56]

I would like to know the distinction between phase & crystal structure? Why do we need to differentiate crystal into phase, if it already have identify of specific crystal structure ?

[@introductiontomaterialsscience]

Phase is a more general term. It could be solid, liquid or gas. A solid phase could be crystalline or amorphous. In case of a crystalline solid phase you need to specify its crystal structure. i hope this clarifies your doubt. If not please let me know.

[@gehadyasser1001]

I can't believe I understand now!Thankuuu so muchh

[@BC-yr6eg]

👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼

[@lakshyarathi6286]

sir what is porosity in simple langauge(physical properties of materail)????????

[@Upgradezz]

Can we have a basis which is to be put away from the lattice points?

[@matiullah1622]

sir please define in detail what is intermetalic compound

[@johnc6490]

I am confused....in definition u r telling crystal is periodic 3d repfesentation in a space but in diagram u r telling 3d arrangement is unit cell....truth is that a unit cell is a part of crystal structure so whatever arrangement in a unit cell is....same will be for crystal...so i think u must first differentiate unit cell and crystal then take unit cell as an example for 3d arrangement

[@introductiontomaterialsscience]

Sorry, but I am not able to catch your argument. Could you please explain again.

[@johnc6490]

@@introductiontomaterialsscience i just want to say that why you have take an example of unit cell in diagram while explaining crystal.......because unit cell has been explained after crystal

[@gulwareena]

Where can I get the balls and sticks to make models for my class?

[@introductiontomaterialsscience]

The NaCl model shown here was part of some set purchased a long ago. Close-packed ball models can be made easily by sticking TT balls using adhesive. These do not require sticks and so are easier to make.

[@gulwareena]

@@introductiontomaterialsscience ok thank you

[@lemiwakjira8680]

thank ya sir 🙏

[@abhilipsasahoo770]

Sir,NaCl is not perfectly cubic. Can you plz. explain the reason?

[@introductiontomaterialsscience]

Why do you say it is not cubic?

[@shivanandkerketta2178]

What is points .....???

[@iamvign35h]

3:23 I was fully concentrated in the class. But when I heard it I started to laugh..

[@introductiontomaterialsscience]

I wonder what made you laugh?

[@iamvign35h]

@@introductiontomaterialsscience The Way Chlorine and sodium was told repeatedly just made me laugh.

[@AmanGupta-zw6wx]

Sir I need this hand written notes, please provide sir,

[@MartinezRBA]

[@Upgradezz]

Thank you

[@CSEAIMLADITYAROSHANDASH]

Engineering made easy by IIT

[@kapilsharma910]

sir without adding infinitely word the definition of crystal is wrong or right . because it may mean that free surfaces may exist there.

[@introductiontomaterialsscience]

Actually, periodicity implies that all lattice points have identical neighbours. This means that there cannot be any free surface and the set of points should be infinite. Thus periodicity implies infinity.