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.
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.
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?
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.
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.
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.
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
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.
@@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 ....
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
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.
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.
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?
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
@@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.
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.
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.
Oh great! I am sorry I took it that way. Could you please explain it better or give me any textbook references
Your videos are like TV series 😂👌 Forcing me to watch nxt episode
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.
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....
Hello sir ur videos helped me to clear course work during my research... Even m dealing wid nanobiosensors
Aapka bahut bahut dhanyavaad yah series banane me liye
Ab hum log BHI aap Jaise great professor se pad sakte hai....
End of the video i found the answer. Beauty!!!!. I am in IITD. Hope to meet you.
Me today at 2:00 AM
Feeling sad for M.L. Frankenhein😭😢😵😷
Me today at 4:02 feeling sad for feankenheim
Me today at 12:30 am feeling sad for the fella as well😢
I feel for Bravais .. no one is acknowledging his work
Me today at 2:34 AM feeling sad for Frankenhein :)
Frankenhein lattices
Thankyou so much sir!!🙏🙏🙏 for putting this much effort, I'm a lot more confident in material science after watching your videos
Very clear explanation sir. Thanks a lot .
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?
Exactly my question.
History can be harsh sometimes 😂😂
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.
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.
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.
It gets explained in later videos. Please look at the playlist.
thank u so much for the lecture sir
sir finally you said bravi also over count it but why there are 14 lattices. Iam totally confused
Just Beautiful!
Thank You :-)
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
Please don't be so harsh. Different people have different learning styles. No teacher or teaching style can suit all students.
@@introductiontomaterialsscience yes sir u are right ....
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.
@@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 ....
@@akashdeep5088 brother, as professor said it's their right. I love it but I can't say everyone should like it.
sir, my question is show different types of bravis lattices
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).
Thank you so much sir this series
At 2:57 magic.
very helpful. . .
Thank you so much sir
Ye sir humare college me aaye h padhane 👀👀🙂🙂
Thanks alot sir for your wonderful videos😊
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
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.
Sir I don't understand the 15:18 to 15:20.😢
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.
What if unit cell has spherical shapes🤔
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?
Sorry, I did not mean this.
I didn't get why cubic F and Tetragonal I was kept in the Bravis Lattices
This is explained in later videos in the playlist.
Justice for frank!!
what is difference between lattice and unit cell?
watch previous video
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
@M Qamar thank you so much
@@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.
@@jejjiz6162 exactly
I didn't understand anything