1.3 Unit cell

[@talsaniyaanil120]

Why can my professors not make it so easy and amazing.... I wasted the whole semester listening to his lectures!!

[@ftxu6348]

These lectures are very good, it's useful for me, thank you!

[@modernengineering8667]

Thanq rajesh sir Hour lecture is so impactive It's helping me Thank you IIT DELHI

[@SameerAli-nm8xn]

I don't have words to describe how easier you have made this subject for me, You are great Sir. Thank you very much.

[@mr.musical4263]

It so much clear to understand the basics and advanced, love the explanation, thanks Sir, IITD and NPTEL for making this available to everyone, we can study even not going to IIT.

[@aradhnakumari657]

I could not believe that I found material science interesting after watching his lectures.

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Surely.

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[@theashleymusic3987]

sir you r great i want to say you please tell other nptel prof. to follow your style of teaching not to make large length vedios like 1 hour

[@nikhilbob8259]

thank you for uploading such nice lectures......

[@ersunnyyy]

well equipped and nicely explained lectures...

[@johnc6490]

At 24:00....in second line if u have made unit cell of crystal then in next there is only need to merge them into a crystal....there will be no need of motif because a unit cell has motif already.....or iin the second line there must be unit cell of lattice rather than unit cell of crystal.

[@introductiontomaterialsscience]

🙂 You are right. I should have written the second line as unit cell of the lattice. Because lattice parameters will give you only the unit cell of the lattice. Thanks for pointing this out.

[@johnc6490]

Btw i am enjoying ur lectures i did not find anyone in my life to explain this subject in such a way.

[@erarjunkumar7334]

Very good information with full depth expansion.

[@sci-fi1998]

Such a nice explanation

[@satyamdubey3151]

Thank you sir for such a course

[@_tushar__mathur_]

thank you very much, sir. and thank you IIT Delhi.

[@brettruss3359]

This is fire!

[@NSBeverything]

thank u sir....sir is there any chance that you make video series on geometric approach of crystallography?

[@tejareddy3076]

Sir, In the previous videos, you clearly showed difference between crystal and lattice. But I have a doubt. When we are talking about an unit cell, should we consider it for a crystal or for a lattice or both?

[@introductiontomaterialsscience]

You can consider a unit cell for either lattice or crystal or both. Usually, we will take the same geometrical unit cell for both a crystal and its associated lattice. However, the content of the unit cell will change with its association. When we consider it the unit cell of a lattice it only has lattice points and no atoms. When we consider it as a unit cell of the associated crystal it will contain atoms.

[@nivethabharathybharathy4298]

Sir, your teaching is awesome ,but if it had some explanation ,really will be great..

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[@wilka6348]

you are my hero

[@sudhanshum5091]

Great Learning

[@nihatarter8750]

Vere helpful. Thank you

[@Scaletheuniverse]

i enjoy it very much.

[@DurgeshKumar-uk9kq]

very clear concepts

[@Upgradezz]

Can a single atom be considered as a unit cell?

[@introductiontomaterialsscience]

No. Single atom or any number of atoms cannot be considered as a unit cell. A unit cell is a volume that fills the space by periodic repetition.

[@fanfanfanfan4601]

Sir When you were explaining non primitive unit cell you gave edge center unit cell as one of the example(which is not possible) can you explain?

[@phasln777]

Thanks a lot sir

[@sonalimishra5137]

Civil branch ka hai ye lectures??

[@BIZWANDERMK]

Best for bsc students..

[@suman-dz8hq]

Excellent

[@kapilsharma910]

Sir what are the deciding factors, to decide the crystal structure of material. I mean how particular material have bcc or ccp crystal structure

[@rajeshprasadlectures]

This is a difficult question. I do not know the answer.

[@amandaher150]

thank you so much sir. i hope god gives you the best of this life and after life.

[@metalhub5625]

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[@udaykumarkondaveeti7698]

Sir as you mention : lattice parameter --> unit cell of crystal --> lattice --> motif --> crystal structure. But in the unit cell itself we are define the motif already. Is it correct sir?

[@introductiontomaterialsscience]

You can include atoms of motif in the unit cell itself. But that information (location and type of atoms) has to be supplied separately. lattice parameter alone is not sufficient to determine it. lattice parameter can only give unit cell shape.

[@BC-yr6eg]

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[@manikandann8869]

Primitive unit cell number of lattice point 4 (or) 1 ? Please explain sir

[@introductiontomaterialsscience]

In a primitive unit cell the number of lattice points will always be one. 1. In a primitive unit cell the lattice points are only at the 8 corners of the parallelepiped cell. 2. Each corner is shared by eight unit cells in the 3D lattice. 3. Therefore, the effective number of the lattice points in the cell is (1/8)*8=1.

[@Rabbiddogg-wf1db]

Can someone explain what non-Cartesian refers to?

[@rajeshprasad101]

Cartesian usually means that the three axes are orthogonal and the three basis vectors are of unit length. Any deviation from this is non Cartesian.

[@Rabbiddogg-wf1db]

Rajesh Prasad Thank you

[@druggist1094]

Sir....is there any possibility option of lattice point location other than corner and middle? If it is not possible means, what is the reason?

[@druggist1094]

Sorry sir...got answer without seeing full video I asked questions.

[@DeathetiCcC]

thank you very very much.

[@laxmikantabehera1925]

Nice sir

[@grideffect1193]

Thank you so much!

[@prakashchandra4207]

Sir phli bar material science smj m aa rha h Please any one have video based on stainless steel to be share

[@parameswararaokedhari4388]

Dear sir, Please clarify my doubt sir. At 58 second of this video you are telling it's a square lattice, but as a picture you are shown in this video is rectangular lattice.

[@VinodKumar-ed1ru]

Thanks sir

[@jayantkumar4131]

Thank you sir

[@niyazisevilen6144]

Hi İndustries are not responsible for implementing sustainable practies. Embodied energy of a material/object is a fundamental index of impact on the sustainability. Are these T or F?

[@jayprakashmaurya281]

Thank you sir.

[@hunglijoytonfu3493]

I must say ur lessons are very similar to Khan academy. But instead of using computer screen, u r using papers...

[@introductiontomaterialsscience]

Is paper OK or you would have preferred the screen?

[@hunglijoytonfu3493]

It is still awesome and I enjoy ur lectures. Thks!!

[@pattharwali9481]

@@introductiontomaterialsscience paper is really better till there is dire necessity for visualisation.

[@siddhu1920]

Way of explanation is not good

[@SushantRath-q7g]

Excellent