Thank you so much sir!! Really I saw many videos but this one cleared all the doubts. You not only cleared doubts but also presented it so well with a beautiful ending. ☺
Thank you very much professor. The way you have explained the concept is so good and crystal clear now. Also, I strongly believe that you are a good teacher as you not only explained the concept but also highlighted the discovery people.
Sir its really amazing its a very good lecture sir. especially the Bragg's assumption on diffracted beam as the reflected beam considering the lattice planes. And the Son and Father got noble prize in 1915 , for their studies[ i completed masters in material science till now i don't know this fact]. Thank you so much sir for updating me.
Sir if you could upload your video on neutron diffraction method and electron diffraction method... That will be immensely helpful... Your lecture are something which I can say getting upto infinity by adding 1+1.... I am proud we have such lecturer in India too
Respected sir, about 8-10 months ago, I have seen your lecture on XRD. Unfortunately, it is not showing on youtube at this time. Can you send me the link related to that lecture?
We see a lot of scientists who made made path breaking discoveries, were not too brilliant. Instead, they thought outside the box..!! Similar case can be observed but in theory of relativity.
Sir the beginning of the class u r mention lave diffraction method [as said in last lecture] but the last lecture is inter planar spacing d hkl and not mention any lave technique.
Sir, according to extinction rules, all reflections are allowed in monoatomic simple cubic crystal. Will 100 reflection be present in CsCl crystal which has a simple cubic lattice with two atom motif ?
🙏🙏👍Wow... Very deep knowledge and explaination... Isiliye mai sirf apke jaise Talented teachers ka hi Video dekhna psnd krta hu nhi to book se pdhta hu. kisi aise vaise teacher ka video nhi dekhta hu... Lekin dukh ki baat ye hai ki apke jaise deep knowledge vale teachers ki youtube pr kmi hai aur JHOLACHP teachers ki bhrmar hai
Well, it really depends on what the heat treatment is doing to the microstructure. If some phase disappears then the peaks of that phase will also disappear. If some new phase appears the corresponding peaks will appear. If residual strains are relieved then the peak width will decrease. If grain size increases then also the peak width will decrease.
Sir, if the direction of incident beam is fixed then for a given set of lattice planes there is only one direction in which the specular reflection can occur. Then sir what is the significance of higher order reflections from a given set of planes. Sir if we keep indicent ray direction fixed shouldn't we get only we reflection direction for each set of planes? Also sir the laue's condition says that for every direction which satisfies the condition K' - K = G, we get a diffracted / reflected beam. That means for fixed incident direction we should get a large number of diffracted beams. I'm confused sir. I hope i'm able to convey my doubt clearly.
For a given plane in a SINGLE CRYSTAL (fixed d), and a given incident beam direction (fixed theta say theta_1) you may or may not get a diffraction depending upon whether Bragg's law is satisfied. And if the Bragg's law is satisfied for n=1, it is the first order diffraction. For the same incident beam in the same direction, you cannot get a second order (n=2) diffraction as it comes at a higher angle theta_2=cos^-1(2*lambda/2d) instead of theta_1=cos^-1(lambda/2d). For a POLYCRYSTALLINE sample (powder) the situation is different. There are many crystals with different orientations. So, some crystal may satisfy the condition for 1st order and some for second or higher order. In effect, you are changing theta by changing the orientation of the crystal even for a fixed incident beam. You may like to check following videos Ewald's sphere: ruclips.net/video/hUWkaxTY3sI/видео.htmlsi=u0dsTHe0B1pn-xxb X-ray Diffraction: ruclips.net/video/Z5aCuGxUPpI/видео.htmlsi=5YCB342PEeZq4hMu
Thanks a lot for asking this question. In fact, there is no proof for the first part. It was an imaginative jump by WL. Bragg (son). The fact that we can explain the diffraction phenomena by this assumption (postulate) can be taken as proof. But there is no simple mathematical derivation like that for the second part.
this is the best explanation on bragg's law that i have seen online ever.. most of the professors don't tell part 1. thank you sir..
The best lecture I have seen on braggs Law...Sir u are a great donor of education 🙏🙏
Thanks to you sir for letting me know the part 1 of Bragg's law. The way you give lecture really amazing.
Thank you so much sir!! Really I saw many videos but this one cleared all the doubts. You not only cleared doubts but also presented it so well with a beautiful ending. ☺
What an eloquent exposition of Bragg's law!
Thank you very much professor. The way you have explained the concept is so good and crystal clear now. Also, I strongly believe that you are a good teacher as you not only explained the concept but also highlighted the discovery people.
Please upload the lecture on xray-diffraction
found it
ruclips.net/video/Z5aCuGxUPpI/видео.html
Sir its really amazing its a very good lecture sir. especially the Bragg's assumption on diffracted beam as the reflected beam considering the lattice planes. And the Son and Father got noble prize in 1915 , for their studies[ i completed masters in material science till now i don't know this fact]. Thank you so much sir for updating me.
Just the explanation i needed!
Sir if you could upload your video on neutron diffraction method and electron diffraction method...
That will be immensely helpful... Your lecture are something which I can say getting upto infinity by adding 1+1.... I am proud we have such lecturer in India too
Now I understand braggs law !!thank you!
❤Thunkyou very much sir
Respected sir, about 8-10 months ago, I have seen your lecture on XRD. Unfortunately, it is not showing on youtube at this time. Can you send me the link related to that lecture?
Yes bro i also want...
ruclips.net/video/Z5aCuGxUPpI/видео.html
Were you looking for this?
We see a lot of scientists who made made path breaking discoveries, were not too brilliant. Instead, they thought outside the box..!! Similar case can be observed but in theory of relativity.
It is well explained lecture. Thanks sir for such videos.
Best explanation.Thank you sir
Very very informative lecture
Sir the beginning of the class u r mention lave diffraction method [as said in last lecture] but the last lecture is inter planar spacing d hkl and not mention any lave technique.
I am only mentioning the historical fact that Lave was to show that crystals diffract x-ray. I have not discussed Laue technique in this channel.
Laue*
@@kuldipkunghadkar6802 ??
Yes brother
Sir, according to extinction rules, all reflections are allowed in monoatomic simple cubic crystal. Will 100 reflection be present in CsCl crystal which has a simple cubic lattice with two atom motif ?
Yes. It will be a weaker reflection than 200. It is called a superlattice reflection.
@@introductiontomaterialsscience
Thank you very much Sir.
Sir, in Bragg's law (part 2)
Angle (Q -theta) lies between normal plane and incident ray
Whatever it may be ... The remaining angle must be equal.. if in your case it's theta.. then 90-theta is going to be equal.
I cannot seem to find part 2.. Do you have a link or some way i can find it?
🙏🙏👍Wow... Very deep knowledge and explaination... Isiliye mai sirf apke jaise Talented teachers ka hi Video dekhna psnd krta hu nhi to book se pdhta hu. kisi aise vaise teacher ka video nhi dekhta hu... Lekin dukh ki baat ye hai ki apke jaise deep knowledge vale teachers ki youtube pr kmi hai aur JHOLACHP teachers ki bhrmar hai
Nice explanation....thnk u sir....
Mai to aapka fan ho gya hun I took geology as my optional paper still your l3ctures are much helpful for me
Thankyou sir..best explanation
If material undergone heat treatment, than what is change in XRD pattern?
Well, it really depends on what the heat treatment is doing to the microstructure. If some phase disappears then the peaks of that phase will also disappear. If some new phase appears the corresponding peaks will appear. If residual strains are relieved then the peak width will decrease. If grain size increases then also the peak width will decrease.
thank you so much Sir , you help me a lot
Sir, if the direction of incident beam is fixed then for a given set of lattice planes there is only one direction in which the specular reflection can occur. Then sir what is the significance of higher order reflections from a given set of planes. Sir if we keep indicent ray direction fixed shouldn't we get only we reflection direction for each set of planes? Also sir the laue's condition says that for every direction which satisfies the condition K' - K = G, we get a diffracted / reflected beam. That means for fixed incident direction we should get a large number of diffracted beams. I'm confused sir. I hope i'm able to convey my doubt clearly.
For a given plane in a SINGLE CRYSTAL (fixed d), and a given incident beam direction (fixed theta say theta_1) you may or may not get a diffraction depending upon whether Bragg's law is satisfied. And if the Bragg's law is satisfied for n=1, it is the first order diffraction. For the same incident beam in the same direction, you cannot get a second order (n=2) diffraction as it comes at a higher angle theta_2=cos^-1(2*lambda/2d) instead of theta_1=cos^-1(lambda/2d).
For a POLYCRYSTALLINE sample (powder) the situation is different. There are many crystals with different orientations. So, some crystal may satisfy the condition for 1st order and some for second or higher order. In effect, you are changing theta by changing the orientation of the crystal even for a fixed incident beam.
You may like to check following videos
Ewald's sphere: ruclips.net/video/hUWkaxTY3sI/видео.htmlsi=u0dsTHe0B1pn-xxb
X-ray Diffraction: ruclips.net/video/Z5aCuGxUPpI/видео.htmlsi=5YCB342PEeZq4hMu
@@introductiontomaterialsscience thank you sir. My doubt is clear now
what is the first law of bragg x ray diffraction why is it called x ray reflection
Respected sir, If in question diffraction angle is given , then do we have to take 2Theta as diffraction angle or will we take theta only ?
Diffraction angle is actually a vague phrase and should be avoided. it is better to use theta or 2 theta.
@@introductiontomaterialsscience ok sir
This was soo deep
Can we distinguished semiconducting and conducting nature of the material by XRD?
I do not know if it is possible.
Thanks a lot Respected Sir.... 🙏🙏🙏 Such an interesting series of lectures....
"the Best"
Respected sir, where is the proof of 1st part of Bragg's law?
Thanks a lot for asking this question. In fact, there is no proof for the first part. It was an imaginative jump by WL. Bragg (son). The fact that we can explain the diffraction phenomena by this assumption (postulate) can be taken as proof. But there is no simple mathematical derivation like that for the second part.
Very much helpful😊
Plz upload more lecture
👍👍👍👍👍
thankyou sir🙏
@7:06, can be explained by elastic scattering?
👍🙏🙏🙏🙏
Thnku sirrrr
Thank you sir
Thank you sir.. best explanation