Free surface or external surface of a crystal

Free surface or external surface of the crystal

[@monemore-animations.9018]

This guy is legendary

[@bestcakesdesign]

He is professor.

[@deepikasingh5785]

Sir aap toh book print krdo ek .......lajabab lecture sir wth great explaination wth best ppsble diagrams sir,🙏

[@anupaglawe5371]

Precise and Perfect Explanation....

[@sexychantu5066]

HANJI BILKUL LOVE FROM IIT ROORKEE THANKS AND REGARDS SEXY CHANTU

[@sexychantu5066]

KYA PADHATE HO SIRJI AAP YOUR VOICE IS SO SOOTHING AND SEDUCTIVE THANKS AND REGARDS LOVE FROM IIT ROORKEE SEXY CHANTU

[@eylulZZ]

Sir, how to calculate surface energy per unit area for a plane in a crystal using that formula, let's say for BCC Crystal (110) plane? I'm getting 5 Dangling bonds...

[@akashtiwari78059]

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[@jarjarbinks9937]

sir is this formula applicable for polycrystalline crystals as well?

[@introductiontomaterialsscience]

No, in a polycrystalline sample, different grains will expose different free surfaces.

[@jarjarbinks9937]

@@introductiontomaterialsscience Okay sir. Thank you

[@pailasaisravan5423]

sir if the atoms require energy to break the bonds , the bonds are already broken so the energy is dissipated . so why again the atoms will have the extra energy sir ??

[@introductiontomaterialsscience]

The energy spent in breaking the bond gets stored in the surface atoms. So the energy of surface atoms is higher compared to that of inside atoms. You can look at it another way also. Formation of each bond lowers the energy of the system. Since surface atoms have less number of bonds their energy is higher.

[@openargument5285]

@@introductiontomaterialsscience Sir my query is same, the energy is utilized to break the bonds of two surfaces which were joined previously so how that energy is stored in surface atoms again.

[@introductiontomaterialsscience]

@@openargument5285 Don't you find the explanation given above satisfactory?

[@openargument5285]

@@introductiontomaterialsscience I understood most of your content, you explained each and every point very well, but this is a little bit confusing.

[@introductiontomaterialsscience]

@@openargument5285 All I can do is to repeat what I have already said. An atom at the surface has a lesser number of bonds as compared to an inside atom. Thus the surface atom is at a higher energy level than the inside atom. This additional energy can be thought of as the surface energy per atom.

[@KanikaBijalwan-pr9oi]

What is free surface?

[@introductiontomaterialsscience]

As the title of the video says, free surface is the external surface of any body.