I have made two mistakes in this video : 1. I have considered Trigonal and Rhombohedral as synonyms for the same crystal system. However, as per the International Tables of Crystallography Vol A it.iucr.org/A/ the two terms are NOT synonymous. Crystal System should only be called Trigonal and not Rhombohedral. 2. I have shown only one Bravais lattice in the trigonal crystal system. But in reality there are two Bravais lattices in the trigonal system: hexagonal prinmitive (hP) and hexagonal rhombohedral (hR). And so there is no trigonal P Bravais lattice as shown in the table in this video. I plan to make a video to clarify this. Wil share the link once I do it. You can check en.wikipedia.org/wiki/Crystal_system.
@rhonrentsops75495 жыл бұрын
Sir, IAM addicted to your teaching.. I wish I had a professor like you in my college. You made it so easy to understand every topic.
@joeking36882 жыл бұрын
Oh great! I am sorry I took it that way. Could you please explain it better or give me any textbook references
@sharaths74713 жыл бұрын
Your videos are like TV series 😂👌 Forcing me to watch nxt episode
@bikeshshrestha95502 жыл бұрын
I love the way he leaves a cliffhanger at the end of the episode, making the audience wanting for more. He should have been one of the writer for game of thrones.
@MySubrata1234 жыл бұрын
A very thoughtful lecture from genius Professor...I just loved it how the way you teach us. Thank you so much for your presentation sir....
@doittoday-ov2km15 күн бұрын
never see such a brilliant teacher ever In my life.... you deserve noble price
@shilpabhoomi78255 жыл бұрын
Hello sir ur videos helped me to clear course work during my research... Even m dealing wid nanobiosensors
@urmendersingh24375 жыл бұрын
Aapka bahut bahut dhanyavaad yah series banane me liye Ab hum log BHI aap Jaise great professor se pad sakte hai....
@akshitasharma53404 жыл бұрын
End of the video i found the answer. Beauty!!!!. I am in IITD. Hope to meet you.
@mechabite80334 жыл бұрын
Thankyou so much sir!!🙏🙏🙏 for putting this much effort, I'm a lot more confident in material science after watching your videos
@ganeshbarhate8374 жыл бұрын
Me today at 2:00 AM Feeling sad for M.L. Frankenhein😭😢😵😷
@Upgradezz3 жыл бұрын
Me today at 4:02 feeling sad for feankenheim
@pankajvats47863 жыл бұрын
Me today at 12:30 am feeling sad for the fella as well😢
@carrokann36383 жыл бұрын
I feel for Bravais .. no one is acknowledging his work
@sushilmotwani29173 жыл бұрын
Me today at 2:34 AM feeling sad for Frankenhein :)
@karanvirsingh28303 жыл бұрын
Frankenhein lattices
@shriramrangarajan92725 жыл бұрын
Very clear explanation sir. Thanks a lot .
@meetgor95282 жыл бұрын
Sir it was really wonderful experience throughout all lecture series! Thank you so much for clearing concepts..... One small doubt is sir, how can we explain why particular crystal system is not there is bravis lattice. For example, why Face center is not there in Monoclinic ? can you pls provide provide one or two examples like this to clear doubt...Thank you.
@introductiontomaterialsscience2 жыл бұрын
Please look at subsequent videos in this playlist, You will get some idea in this direction although the specific monoclinic example has not been discussed.
@tapashreedas60744 жыл бұрын
Q. On s.s.p 1.By cubic end centred lattice we can form tetragonal p lattice so in bravais lattice cubic end centred lattice is not included.Now By cubic face centred lattice we can form tetragonal body centred lattice .but in bravais lattice both cubic F and tetragonal body cenred is included .why so?
@joeking36882 жыл бұрын
Exactly my question.
@anonymousreviewer38163 жыл бұрын
Just Beautiful! Thank You :-)
@sourav7465 жыл бұрын
History can be harsh sometimes 😂😂
@HappyVibes12873 жыл бұрын
Objective questions of SAIL and TATA JET can be practiced free of cost from metallurgy app ( no. 1 app with keyword metallurgy from play store).
@akashdeep50883 жыл бұрын
Those who have disliked the video is surely the ones who are studying from low grade private colleges ...and don't have that much brains to understand the so much simple explanation
@introductiontomaterialsscience3 жыл бұрын
Please don't be so harsh. Different people have different learning styles. No teacher or teaching style can suit all students.
@akashdeep50883 жыл бұрын
@@introductiontomaterialsscience yes sir u are right ....
@saikumarkrithivasan1363 жыл бұрын
Akash deep, am a lecturer working in private college. Am a physics lecturer and am watching these excellent lectures. But low grade private college is very abusive.
@akashdeep50883 жыл бұрын
@@saikumarkrithivasan136 sry sir for my words ....but you only think the effort it takes to record the videos covering all the topics ....but then also some are disliking it ....
@saikumarkrithivasan1363 жыл бұрын
@@akashdeep5088 brother, as professor said it's their right. I love it but I can't say everyone should like it.
@deepakpatil96823 жыл бұрын
Sir still not get that why we consider both cubic F and tetragonal I as bravais lattices but only consider tetragonal P and not cubic C.Hope you will answer soon.
@rajeshprasadlectures3 жыл бұрын
It gets explained in later videos. Please look at the playlist.
@rameshbanoth87946 жыл бұрын
thank u so much for the lecture sir
@sonubishwas53006 жыл бұрын
Thank you so much sir this series
@phanicharankumar23104 жыл бұрын
sir finally you said bravi also over count it but why there are 14 lattices. Iam totally confused
@inderjeetbasantani43895 жыл бұрын
sir, my question is show different types of bravis lattices
@shaikakhila97384 жыл бұрын
Thanks alot sir for your wonderful videos😊
@physicsonyourscreenproblem5754 жыл бұрын
At 2:57 magic.
@manikandann8869 Жыл бұрын
Sir I don't understand the 15:18 to 15:20.😢
@sheshurguktbasar93255 жыл бұрын
Thank you so much sir
@tashi20095 жыл бұрын
very helpful. . .
@crackit57474 жыл бұрын
Can't understand this topic 😔😔..2nd yr student..when the end centerd cubic cell does not exist then why sir is showing a new end centerd cubic cell....mess up ho gya sb
@introductiontomaterialsscience4 жыл бұрын
Well, what I am trying to do is to explore the reason why 'end-centred cubic' lattice has not been considered as a Bravais lattice. The question becomes relevant when you find that it is possible to make an end-centred cubic unit cell and repeat it to get a lattice. So if I can have a lattice which is generated by repeating an end-centred cubic unit cell then why does not Bravais' list contains it? This is a central question bearing on the meaning of Bravais lattice. So please go through the video once more and I hope the 'mess' will clear up. Do not hesitate to let me know if confusion persists.
@joeking36882 жыл бұрын
So he discounted tetragonal body cetred because he only wanted an even number? This is very unconvincing. Can you give a better explanation to this please?
@rajeshprasad1012 жыл бұрын
Sorry, I did not mean this.
@harshagarwal71934 жыл бұрын
Sir one doubt is there, why are we comparing the existence of both cubic C and tetragonal I with bravais lattice, may be he was wrong and is still not corrected, also even after using symmetry for classification, we are having multiple choice for unit cell for fcc, as u said in one of your answers on quora that we just prefer the cubic C over tetragonal I.
@mohitpuranik95942 жыл бұрын
I didn't get why cubic F and Tetragonal I was kept in the Bravis Lattices
@introductiontomaterialsscience2 жыл бұрын
This is explained in later videos in the playlist.
@038_priyanshuraj22 жыл бұрын
Ye sir humare college me aaye h padhane 👀👀🙂🙂
@phanindrasharmapydimarri47754 жыл бұрын
What if unit cell has spherical shapes🤔
@drkhan4623 жыл бұрын
Justice for frank!!
@akshitasharma53404 жыл бұрын
what is difference between lattice and unit cell?
@romikukadiya9004 жыл бұрын
watch previous video
@vamsireddy3574 жыл бұрын
Unit cell is the smallest part of the lattice which can be repeated in three directions to form a lattice And lattice is a 3d repetition of points in space and when those points are occupied by atoms( motif) can become the crystal
@vamsireddy3574 жыл бұрын
@M Qamar thank you so much
@jejjiz61624 жыл бұрын
@@vamsireddy357 A unit cell is not necessarily the smallest part of the lattice that can be periodically repeated in three dimensions to form a lattice. As he explained, one or more unit cells can also contain other unit cells. For example: two cubic F unit cells contain one, smaller, tetragonal I unit cell. Lattices are periodic repetitions of points in space. It's important to note that they must be periodic and that the space it occupies does not need to be threedimensional.