Scott Ramsay
Scott Ramsay
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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.
Переглядів: 2 905

Відео

Cation to anion radius ratio for tetrahedral interstitial site
Переглядів 2,6 тис.Рік тому
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
Переглядів 834Рік тому
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)
Переглядів 7 тис.3 роки тому
This video is about 76 The iron carbon system
75 Deriving the Lever Rule (screen only)
Переглядів 5 тис.3 роки тому
This video is about 75 Deriving the Lever Rule
73 A first look at phase diagrams (screen only)
Переглядів 5 тис.3 роки тому
This video is about 73 A first look at phase diagrams
59 The diamond cubic crystal structure
Переглядів 9 тис.3 роки тому
59 The diamond cubic crystal structure
My Teaching from home video set-up
Переглядів 2,2 тис.4 роки тому
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
Переглядів 1,5 тис.4 роки тому
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
Переглядів 2,4 тис.4 роки тому
34 Mechanical behaviour of polymers
30 The Boltzmann Distribution and vacancies
Переглядів 1,1 тис.4 роки тому
30 The Boltzmann Distribution and vacancies
29 Point Defects
Переглядів 1,4 тис.4 роки тому
29 Point Defects
31 Lattice strain around Dislocations
Переглядів 3,1 тис.4 роки тому
31 Lattice strain around Dislocations
28 Introduction to Imperfections
Переглядів 9464 роки тому
28 Introduction to Imperfections
26 Mechanism for plastic deformation in metals
Переглядів 3,6 тис.4 роки тому
26 Mechanism for plastic deformation in metals
32 Interfacial defects
Переглядів 2 тис.4 роки тому
32 Interfacial defects
33 3 Dimensional defects
Переглядів 6124 роки тому
33 3 Dimensional defects
25 Yield, tensile strengths and necking
Переглядів 7 тис.4 роки тому
25 Yield, tensile strengths and necking
27 Dislocation Movement
Переглядів 6 тис.4 роки тому
27 Dislocation Movement
24 From Crystals to Properties
Переглядів 1,3 тис.4 роки тому
24 From Crystals to Properties
21 Simple Cubic Interstitial Site
Переглядів 1,3 тис.4 роки тому
21 Simple Cubic Interstitial Site
23 Coordination Number for FCC
Переглядів 6 тис.4 роки тому
23 Coordination Number for FCC
22 PbSe Crystal Structure Predicition
Переглядів 3594 роки тому
22 PbSe Crystal Structure Predicition
18 2 Hexagonal Close Packed
Переглядів 2 тис.4 роки тому
18 2 Hexagonal Close Packed
18 The Octahedral Site
Переглядів 8974 роки тому
18 The Octahedral Site
20 APF in FCC and BCC
Переглядів 7444 роки тому
20 APF in FCC and BCC
16 Ceramic Density Calculations
Переглядів 5 тис.4 роки тому
16 Ceramic Density Calculations
17 Body Centred Cubic BCC
Переглядів 2,1 тис.4 роки тому
17 Body Centred Cubic BCC
14 Theoretical Density of Al
Переглядів 11 тис.4 роки тому
14 Theoretical Density of Al
10 Materials Selection for Helicoptor Rotor
Переглядів 1 тис.4 роки тому
10 Materials Selection for Helicoptor Rotor

КОМЕНТАРІ

  • @anthonyjnr.alakpa2135
    @anthonyjnr.alakpa2135 2 дні тому

    This is a fantastic lecture. I understood from the very first example. Thank you. 🎉

    • @ScottRamsay
      @ScottRamsay 2 дні тому

      Thank you very much for your kind comment. I’m glad it helped you understand the topic!

  • @paingsoekhant8731
    @paingsoekhant8731 4 дні тому

    Well-explain

  • @user-bu3uc8ew7j
    @user-bu3uc8ew7j 13 днів тому

    16 =√4 is not √8 !

  • @sanskarsoven3762
    @sanskarsoven3762 14 днів тому

    U should be ashamed for being from such a great university and giving wrong information.

    • @ScottRamsay
      @ScottRamsay 14 днів тому

      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.

  • @SahanPerera-vo3xd
    @SahanPerera-vo3xd Місяць тому

    Thankyou so much it helped a lot

  • @WISEMANYT
    @WISEMANYT Місяць тому

    Why lever rule is only applicable to binary phase system not tertiary phase system?

  • @adamshenk9970
    @adamshenk9970 Місяць тому

    boss thank you

  • @anjishnupurkait2918
    @anjishnupurkait2918 Місяць тому

    thanks for this 🙏🏻

  • @justme8488
    @justme8488 2 місяці тому

    WOW finally understand in what angle the calculation is! What drawing board do you use?

    • @ScottRamsay
      @ScottRamsay Місяць тому

      I use Sketchbook Pro. It’s pretty good. The layers are handy and it’s relatively simple, which works well for me!

  • @realbartonjames
    @realbartonjames 2 місяці тому

    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").

    • @ScottRamsay
      @ScottRamsay Місяць тому

      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.

  • @factnie24
    @factnie24 2 місяці тому

    You explained it super differently clear

  • @BioPhys92
    @BioPhys92 2 місяці тому

    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?

  • @adamshenk9970
    @adamshenk9970 2 місяці тому

    boss thanks so much

  • @timecode37
    @timecode37 3 місяці тому

    respect for fighting through the dry throat attack to inform us about crystal structures

  • @chimwemwemagolowondo4556
    @chimwemwemagolowondo4556 3 місяці тому

    beautifully explained.

  • @yourstudypalhp215
    @yourstudypalhp215 3 місяці тому

    This guy lowkey looks like walter white but shaved

  • @Surfsailwaves
    @Surfsailwaves 3 місяці тому

    Cliffhanger - how do we find the volume of the unit cell?

  • @msuproduction5472
    @msuproduction5472 4 місяці тому

    Thank you sir

  • @user-hy7wl9sz5d
    @user-hy7wl9sz5d 5 місяців тому

    really helpful

  • @EkaraLibrae
    @EkaraLibrae 5 місяців тому

    Well that was easy, simple to follow - to the point discussion on planes.

  • @faisalbashir4563
    @faisalbashir4563 5 місяців тому

    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.

    • @ScottRamsay
      @ScottRamsay 5 місяців тому

      Thanks for letting me know! That’s great to hear. I’m planning to add some new videos soon.

    • @suyashsrivastav312
      @suyashsrivastav312 4 місяці тому

      bhai is branch m nhi krna tha yar. badi jhantu branch h

  • @mohamedibrahim1023
    @mohamedibrahim1023 5 місяців тому

    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

  • @jayasrijaishankar6727
    @jayasrijaishankar6727 5 місяців тому

    You really made me understand this very well thank you 💗💗

  • @Aidanryry
    @Aidanryry 5 місяців тому

    how do you find the radius from the ratio?

  • @nitinnitrourkela7461
    @nitinnitrourkela7461 5 місяців тому

    viah hogaya tumra

  • @user-qj3rv2mo1b
    @user-qj3rv2mo1b 5 місяців тому

    We calculate % w on isotherms always?

  • @vincebatt86
    @vincebatt86 5 місяців тому

    Well done Scott

  • @yeah2646
    @yeah2646 6 місяців тому

    You are one of the greatest professors i've ever had. Thank you so much

  • @donghuanix8455
    @donghuanix8455 6 місяців тому

    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).

  • @jastejpabla3639
    @jastejpabla3639 6 місяців тому

    how did you get 4r?

  • @madri00
    @madri00 6 місяців тому

    Great❤❤

  • @rakhik2910
    @rakhik2910 6 місяців тому

    Thank u sir. Clearly explained. Love from india

  • @morisg99
    @morisg99 6 місяців тому

    Thank you so very kindly professor, please take care! Thank you!!!

  • @malavikamanoj003
    @malavikamanoj003 6 місяців тому

    Thank you so much for the explanation. I was really confused by the diagrams in the text and Google. Your video helped a lot.

    • @ScottRamsay
      @ScottRamsay 6 місяців тому

      So glad you found it helpful!

  • @Ahmad-py7wz
    @Ahmad-py7wz 6 місяців тому

    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?

  • @jelysun
    @jelysun 6 місяців тому

    thank you so much 🙏❤

  • @rez8o352
    @rez8o352 7 місяців тому

    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

  • @nightshade9186
    @nightshade9186 7 місяців тому

    Is that diffraction or reflection? diffraction happens when X-ray goes through a slit ?

    • @ScottRamsay
      @ScottRamsay 7 місяців тому

      You’re right that it is diffraction, but we can model it like simple reflection.

  • @tomchen6990
    @tomchen6990 8 місяців тому

    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!

  • @asif7240
    @asif7240 8 місяців тому

    Thanks

  • @user-bb6ys4rj5p
    @user-bb6ys4rj5p 8 місяців тому

    Where is the previous video (74)? Could you please share the link?

  • @sanjayprajapat1665
    @sanjayprajapat1665 8 місяців тому

    Thank you sir

  • @integration2494
    @integration2494 8 місяців тому

    From India very helpfull video sir

  • @yigitcan824
    @yigitcan824 8 місяців тому

    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?

  • @kianhelali2073
    @kianhelali2073 8 місяців тому

    Clear and simple, yet complete. Thank you for providing such resources.

  • @ashwalker1
    @ashwalker1 8 місяців тому

    Ty fam

  • @roumanfirdous8707
    @roumanfirdous8707 8 місяців тому

    this is side of BCC not APF.... u hve tot do more to find APF

  • @beratalkan9115
    @beratalkan9115 9 місяців тому

    Thank you

  • @vijy9980
    @vijy9980 9 місяців тому

    Can I rotate the coordinate system by 90 degrees in any direction? If my intercepts are correct, I should be fine, right?

    • @ScottRamsay
      @ScottRamsay 9 місяців тому

      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.

    • @vijy9980
      @vijy9980 9 місяців тому

      @@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?

  • @me-hr3ej
    @me-hr3ej 9 місяців тому

    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!