SAED, Selected Area Electron Diffraction Pattern: A Single Vs. Poly-crystalline Material

How to interpret Selected Area Electron Diffraction (SAED) graphs and HR-TEM/SAED graphs in your research paper or thesis?
SAED gives information whether your material is mono-crystalline, poly- crystalline or amorphous.
It gives the following information about the materials (Nanostructured Materials)
i. TEM is basically a nano size characterization tool.
ii. Shape and particle size (morphology, crystallite size, grain size, particle size, lattice information, plane indices, dislocations, and diffraction patterns)
iii. Grain boundaries

[@anusingh2009]

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[@qamarwali]

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[@qamarwali]

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[@kjh32789]

it's a best video for me studying about SAED. thanks.

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[@qamarwali]

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[@qamarwali]

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[@qamarwali]

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[@qamarwali]

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[@wahidurrahman2498]

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[@qamarwali]

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[@imamhussain6832]

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[@qamarwali]

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[@qamarwali]

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[@arunbabuktkmce]

X-Ray diffraction analyses would tell you whether the material is single-crystalline or poly-crystalline. In fact, in single-crystalline material, only one peak would be present. The peak intensity of the peaks also varies from powdered sample if texture is present. Similarly, in TEM analyses, if the beam covers multiple grains, which we usually observe during the diffraction of nanocrystalline material, we get spots from different grains and it may form rings.

[@qamarwali]

Agreed. Single crystalline material gives sharp dots pattern while polycrystalline material gives sharp ring pattern. If the material is amorphous, it gives thick diffuse ring pattern.

[@arunbabuktkmce]

Bro, poly-crystalline material also would give spot patterns. It often happens when the diameter of the grains falls within the micro-meter range, and those micron grain sized materials could be referred to as poly-crystalline. I agree if the grain size is smaller than the beam diameter or spot size which often leads to the diffraction of various grains simultaneously and produce rings. We often see rings in the case if nano sized precipitates are homogeneously distributed in the matrix.

[@qamarwali]

@@arunbabuktkmce Agreed, good explanation. I just explained in broad the difference among the single and poly crystalline.

[@arunbabuktkmce]

It is misguiding. If you use nano-crystalline instead of poly-crystalline, the result may be acceptable broadly

[@qamarwali]

@@arunbabuktkmce I don't understand nono crystalline? Both single crystalline and polycrystlline are nanomaterials?? So what do you mean by that

[@elasticman8868]

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[@qamarwali]

You are always welcome.

[@LearnwithAasma]

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[@ToanNguyen-1990]

Thank you very much for your useful explanation.

[@qamarwali]

You are welcome

[@pravinbendle4082]

Thank you sir for a very nice explanation.

[@qamarwali]

I am happy it helps. Welcome

[@adrianarocha400]

Thanks a lot for the explanations 😊

[@qamarwali]

I am happy you like it. Thanks for watching my videos

[@rashmi1906]

Very Useful information, Thanks for the video. Please make videos for the characterization data interpretation

[@qamarwali]

Thank you very much. Please see a lot of videos on this channel on characterization

[@mukheshk.g.1850]

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[@sachinpotdar1158]

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[@-dyah_purwaningsih5752]

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[@qamarwali]

I am happy it helps

[@mariamhasany5250]

Superb explanation

[@qamarwali]

Thankful. I am so happy it helps

[@arnauldroberttapa2139]

Thanks for the video. Can you also make a video on how to index the SAED using Gatan. Especially SAED of single crystal.

[@qamarwali]

Thank you sir. Sure I will prepare

[@prasadmattipally]

@@qamarwali am waiting for gatan microsuit for saed nd TEM image analysis. Howto download it??? Help me sir

[@fazilasaddique648]

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[@qamarwali]

Many thanks 😊

[@mohiniverma9710]

awesome lecture video

[@kknives_switzerland]

Very helpful, thank you.

[@qamarwali]

You are always welcome Sir

[@risingchemistry7434]

Sir I have one question if only circle is appear not in dots form then its crystalline or amorphous

[@qamarwali]

If circled appear, then it's sure that the material is *polycrystalline*
If diffuse rings appear, then the material is *Amorphous*
Diffuse means the rings look blurred and not too visible
If dots appear but sharp dots, then it's sure the material is *Single-crystal*
If

[@decalogians9321]

Thanks for this video

[@qamarwali]

You are welcome Sir.

[@AnwarAli-ee3ch]

Amazing sir g.....

[@gauravpandey7681]

Thanks

[@ubaidahmed6621]

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[@qamarwali]

Exactly. Thanks for watching

[@hassanalkhabbaz6977]

Thank you Mr
I need to know how to measure d spacing

[@qamarwali]

Very easy. Will make video on it

[@rinivarghese949]

Thank you Sir

[@qamarwali]

You are welcome

[@valentinamarin2875]

Thanks for the video. How can I identify the crystallographic plane in a IFFT image? Since I don't have a SAED pattern image.

[@qamarwali]

Welcome. FESEM can not tell us the crystallographic plan. Only SAED or XRD can confirm.
BTW what is IFFT?

[@KumarGaurav-yy6wh]

Hi, You can do that using digital-micrograph software for IFFT and plane information. Just check any TH-cam video for downloading and using this software. Several videos are available! Thanks

[@gauravbassi5871]

Dear sir, looks-wise polycrystalline and amorphous SAED pics are very similar, how we differentiate them, please make on it also

[@qamarwali]

Good question!. I think the SAED we uses for the crystalline materials whether it is single or polycrystlline. I am not sure about amorphous because in amorphous there is a complete disorder so I don't think this characterization tool will help.

[@kamalmustafa6054]

How amorphous sturcture look likes in a picture?

[@qamarwali]

The amorphous materials do not have any structure because the atoms are distributed in a complete disorder form as a result of no definite shape or structure

[@AnkitaSingh-go7cz]

How to explain SAED pattern if it is diffused? Can we calculate lattice planes from it?

[@qamarwali]

Yes sure. You can explain from it but I have just shown in this video just the difference between them

[@AnkitaSingh-un3sj]

@@qamarwali Can you suggest me some reference on how to do it?

[@qamarwali]

To be honest, I am not an expert of it. I have just shown in this video the difference between single and polycrystalline.
I am sure that there are a lot of materials and sources online.

[@cevattayyar7924]

zoom zoom zoom

[@bilimeow7717]

Hi sir
How are you??
I am facing a problem in interpretation of SAED can you please provide your email? So i can discuss my problem with you

[@qamarwali]

[e-mail]