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.
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?
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. ☺
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
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 ?
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 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: th-cam.com/video/hUWkaxTY3sI/w-d-xo.htmlsi=u0dsTHe0B1pn-xxb X-ray Diffraction: th-cam.com/video/Z5aCuGxUPpI/w-d-xo.htmlsi=5YCB342PEeZq4hMu
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.
🙏🙏👍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
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.
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 🙏🙏
Mai to aapka fan ho gya hun I took geology as my optional paper still your l3ctures are much helpful for me
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.
Please upload the lecture on xray-diffraction
found it
th-cam.com/video/Z5aCuGxUPpI/w-d-xo.html
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...
th-cam.com/video/Z5aCuGxUPpI/w-d-xo.html
Were you looking for this?
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. ☺
Thanks to you sir for letting me know the part 1 of Bragg's law. The way you give lecture really amazing.
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
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
Very very informative lecture
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.
Thanks a lot Respected Sir.... 🙏🙏🙏 Such an interesting series of lectures....
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.
All the 15 videos have been very helpful. Thank you, Sir
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: th-cam.com/video/hUWkaxTY3sI/w-d-xo.htmlsi=u0dsTHe0B1pn-xxb
X-ray Diffraction: th-cam.com/video/Z5aCuGxUPpI/w-d-xo.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
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.
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?
Can we distinguished semiconducting and conducting nature of the material by XRD?
I do not know if it is possible.
Just the explanation i needed!
This was soo deep
🙏🙏👍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
Best explanation.Thank you sir
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.
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
What an eloquent exposition of Bragg's law!
❤Thunkyou very much sir
Thankyou sir..best explanation
thank you so much Sir , you help me a lot
👍👍👍👍👍
Now I understand braggs law !!thank you!
It is well explained lecture. Thanks sir for such videos.
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.
Thank you sir.. best explanation
Plz upload more lecture
Nice explanation....thnk u sir....
thankyou sir🙏
👍🙏🙏🙏🙏
"the Best"
Very much helpful😊
Thnku sirrrr
@7:06, can be explained by elastic scattering?
Thank you sir