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Scott Ramsay
Canada
Приєднався 21 вер 2012
This channel aims to help you to understand solids. Solids are all around us and are largely the focus of the field of study known as materials science. By understanding the way solids are put together (their microstructure) we can understand why various materials behave as they do. In many cases we can even use our understanding of solids to change the way they behave.
c to a ratio for hexagonal close packed (HCP)
Proving that the ideal c/a ratio for HCP is 1.633 is actually relatively simple once you understand the positions of the mid-plane atoms and if you understand the tetrahedral geometry. If you aren't comfortable with the tetrahedral interstitial site take a look at my video explaining that. Hope this is helpful.
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Відео
Cation to anion radius ratio for tetrahedral interstitial site
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Shows how to calculate the Rc-to-Ra ration for the tetrahedral interstitial site, that is, the minimum size of a cation that can occupy the tetrahedral (CN=4) interstitial site.
Tetrahedral symmetry, tetrahedral interstitial site, bond angle in methane, diamond cubic, silicon
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Description of the tetrahedral symmetry found in the tetrahedral interstitial site, methane, diamond cubic, etc. I show how I like to approach this important piece of geometry by fitting it within a cube. As an example, I show how you can quickly calculate the C-C bond angle from this approach.
76 The iron carbon system (screen only)
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This video is about 76 The iron carbon system
75 Deriving the Lever Rule (screen only)
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This video is about 75 Deriving the Lever Rule
73 A first look at phase diagrams (screen only)
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This video is about 73 A first look at phase diagrams
59 The diamond cubic crystal structure
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59 The diamond cubic crystal structure
My Teaching from home video set-up
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This is a little video that I put together to share with some colleagues a description of the video recording set-up that I have moved home, from my office. My videos are certainly not perfect, and I'm far from a video expert, but some people were curious, so here it is! I had a little fun making this, so I hope its interesting, if not useful. I hope you're not scared off by my singing. Let me ...
HCl Cannon, short
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This is a cool demonstration where I detonate a mixture of chlorine gas and hydrogen gas using a blue laser. A red laser and a green laser don't have high enough photon energy to break the Cl_2 double bond, but the blue photons do. This is probably my current favourite demonstration, combining discussions of the electromagnetic spectrum, the quantization of energy, covalent bond strengths and d...
34 Mechanical behaviour of polymers
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34 Mechanical behaviour of polymers
30 The Boltzmann Distribution and vacancies
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30 The Boltzmann Distribution and vacancies
31 Lattice strain around Dislocations
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31 Lattice strain around Dislocations
26 Mechanism for plastic deformation in metals
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26 Mechanism for plastic deformation in metals
25 Yield, tensile strengths and necking
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25 Yield, tensile strengths and necking
10 Materials Selection for Helicoptor Rotor
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10 Materials Selection for Helicoptor Rotor
This is a fantastic lecture. I understood from the very first example. Thank you. 🎉
Thank you very much for your kind comment. I’m glad it helped you understand the topic!
Well-explain
16 =√4 is not √8 !
U should be ashamed for being from such a great university and giving wrong information.
This can be a challenging crystal structure to picture so I can understand your frustration. My depiction is correct, but I'm guessing that you are more familiar with this structure represented as an FCC lattice of cations with anions occupying the tetrahedral interstitial sites. I demonstrate how to visualize calcium fluorite using both approaches in another video (ua-cam.com/video/AZ_tHBIBQWU/v-deo.html) I hope this is helpful to you. I always welcome feedback. Good luck with your studies.
Thankyou so much it helped a lot
Why lever rule is only applicable to binary phase system not tertiary phase system?
boss thank you
thanks for this 🙏🏻
WOW finally understand in what angle the calculation is! What drawing board do you use?
I use Sketchbook Pro. It’s pretty good. The layers are handy and it’s relatively simple, which works well for me!
Hi Scott. GREAT description, Thanks! If the Cation can be about 23% of the Anion, we're describing its maximum size that can occupy the interstitial.... (FYI: description above reads "minimum").
Thanks for your kind words! The cation can be larger than the size where it just touches its nearest neighbor anions. If it’s smaller, then it would occupy the next smaller interstitial site. The maximum size for the tetrahedral site corresponds to the minimum size for the octahedral site.
You explained it super differently clear
Thank you, that was helpful. I know you touched on it at the end, but just to confirm. So the parallel planes (the other three sides of the cube), they aren't required because they are just 'translations' of the planes you did shade in?
boss thanks so much
respect for fighting through the dry throat attack to inform us about crystal structures
beautifully explained.
This guy lowkey looks like walter white but shaved
Cliffhanger - how do we find the volume of the unit cell?
Thank you sir
really helpful
Well that was easy, simple to follow - to the point discussion on planes.
I'm majoring in Metallurgical and materials Engg. , I have been watching your video lectures for past 2 years. You have been a great help.
Thanks for letting me know! That’s great to hear. I’m planning to add some new videos soon.
bhai is branch m nhi krna tha yar. badi jhantu branch h
Awesome video, but there is something confusing me , for C alpha and C liquid how they can be used as percentages of solid component or liquid component, as i understand the definition of C alpha or C liquid as they are compositions ratios in which at a particular temperature they are at solidus line or liquidus line , so if can any one clarify for me this confusion and thanks
You really made me understand this very well thank you 💗💗
how do you find the radius from the ratio?
viah hogaya tumra
We calculate % w on isotherms always?
Well done Scott
You are one of the greatest professors i've ever had. Thank you so much
For aluminum/aluminium, 143 pm is metallic radius (used in video). Other value (in pm) are: 118 (calculated radius), 125 (empirical), 126 (covalent radius in single bond, coordination number =3), 113 (covalent double bond), 111 (covalent triple bond) and 184-225 (various van der Waals radius, depend on method used).
how did you get 4r?
Great❤❤
Thank u sir. Clearly explained. Love from india
Thank you so very kindly professor, please take care! Thank you!!!
Thank you so much for the explanation. I was really confused by the diagrams in the text and Google. Your video helped a lot.
So glad you found it helpful!
Thanks for the wonderful video. Just would like to ask, is it a similar concept to how lattice mismatch creates piezoelectric polarization through internal strain?
thank you so much 🙏❤
you've proven that not everyone can deliver this kind of information as logical and clear as you just did. you have my gratitude sir
Is that diffraction or reflection? diffraction happens when X-ray goes through a slit ?
You’re right that it is diffraction, but we can model it like simple reflection.
It is a real pleasure to be one of your students, be well and hope to see you on campus next year after the break!
Thanks
Where is the previous video (74)? Could you please share the link?
Thank you sir
From India very helpfull video sir
Professor I have a question .Maximum solubility of carbon in FCC iron is 2% but steel is produced below 1.4% carbon and cast iron is produced between 3-4.5% carbon. Why?
Clear and simple, yet complete. Thank you for providing such resources.
Ty fam
this is side of BCC not APF.... u hve tot do more to find APF
Thank you
Can I rotate the coordinate system by 90 degrees in any direction? If my intercepts are correct, I should be fine, right?
If you mean just axes and not the plane also, then no. This would result in a different plane. For example, looking at the front face of a cube along the x-axis, you’d be looking at the (100) plane, but looking at a cube face along the y-axis you’d be looking at the (010) plane. If I rotated the whole thing, axes and planes, 90 degrees about the z-axis then the plane would remain the same but my perspective would have changed.
@@ScottRamsay Yes that's what I mean, effectively you're just changing the orientation of the piece of material whose properties' directions you are representing with miller indices right?
You are awesome! All of us appreciate the work you put in to supporting students and creating a lecture environment that is engaging and friendly, thank you Dr. Ramsay!
Thanks so much!