Subatomic microscopy as a key to materials design

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Subatomic microscopy as a key to materials design

Post by Cr6 on Sun Apr 29, 2018 8:46 pm

Subatomic microscopy as a key to materials design

Colorized sub-Angstrom scanning transmission electron microscope image clearly shows individual columns of atoms in the brick-and-mortar structure of Ruddlesden-Popper Sr7Ti6O19.

Overlaid simulated image shows close agreement between theory and experiment.

Credits/Names:
Greg Stone1, Colin Ophus2, Turan Birol3, Jim Ciston2, Che-Hui Lee1, Ke Wang1, Craig Fennie3, Darrell Schlom3, Nasim Alem1, Venkat Gopalan1
1Penn State, 2Molecular Foundry, Lawrence Berkeley National Lab, 3Cornell University

Layered complex oxides offer an unusually rich materials platform for emergent phenomena through many built-in design knobs such as varied topologies, chemical ordering schemes and geometric tuning of the structure. A multitude of polar phases are predicted to compete in Ruddlesden–Popper An+1BnO3n+1 thin films by tuning layer dimension and strain. Using aberration-corrected scanning transmission electron microscopy with sub-Ångstrom resolution in Srn+1TinO3n+1 thin films, the IRG team demonstrated the coexistence of antiferroelectric, ferroelectric and new ordered and low-symmetry phases. The atomic rumpling of the rock salt layer, a critical feature in RP structures that is responsible for the competing phases, was directly imaged with exceptional quantitative agreement between electron microscopy and density functional theory down to 5pm (about 1/10th the size of a hydrogen atom). Such sub-atomic metrology can be transformative in bringing theory and experiments together for materials design at large

https://www.mrsec.psu.edu/content/subatomic-microscopy-key-materials-design
https://www.mrsec.psu.edu/sites/mrsec.psu.edu/files/IRG1%20Subatomic%20microscopy%20Revised.pdf

Cr6
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Re: Subatomic microscopy as a key to materials design

Post by Jared Magneson on Fri May 11, 2018 12:51 am

The atomic rumpling of the rock salt layer, a critical feature in RP structures that is responsible for the competing phases, was directly imaged with exceptional quantitative agreement between electron microscopy and density functional theory down to 5pm (about 1/10th the size of a hydrogen atom).

So they alleged to have "directly imaged" this structure but can't supply the direct image? They have a blurry one, then a "zoom-in" showing obvious inlaid colored circles. Which means they're still nowhere near the Hydrogen level, and not even close to the claimed 1/10th below that. Wouldn't they show such an image if they had one? Or show both at the least, to demonstrate said accuracy? I would.

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Re: Subatomic microscopy as a key to materials design

Post by Cr6 Yesterday at 2:05 am

You know Jared everything I've seen in published papers on "nano" (and quantum for that what it means) ... is that it is difficult to "capture" and "replicate". I would imagine many photos showing "capture" in detail would require an enormous amount of interpretation without the charge field. They can get a fleeting piece of the C.F. but not a full picture in terms of "electron bonds" and "atoms". I think Miles' had a photo of a decent somewhat blurred "atom" but getting further detail would be a massive challenge. Could be wrong though as tech improves with this.

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Re: Subatomic microscopy as a key to materials design

Post by Jared Magneson Yesterday at 12:08 pm

Cr6 wrote: I think Miles' had a photo of a decent somewhat blurred "atom" but getting further detail would be a massive challenge. Could be wrong though as tech improves with this.

I recall that photo as well, but couldn't readily find it. Here's the best "photo" I could find myself, of helium (the Alpha):


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