Searching for One of Nature’s Missing Crystal Structures

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Presentation transcript:

Searching for One of Nature’s Missing Crystal Structures Thomas McConkie, David Allred, Gus Hart, Brian Hicks

Overview What missing crystal structures? Setup and Preparation Experimental Methods Results Continuing the Search

What missing crystal structures? “Where are natures missing structures?” Gus Hart, Nov. 11, 2007 L13 Structure

Setup and Preparation Vacuum system Sputtering Gun Roughing, Turbo and Cryo Pumps. Leaked checked system to minimize unwanted interference by outside air. Base pressure of (~10-6 torr). Sputtering Gun

Process Sputtering Magnetron Sputtering Even coating on all surfaces Sputtering plasma: Ar+ Pt Cd Magnetron Sputtering Lower pressure (~10-3 torr). Better quality

EDAX Composition Crystal Structure STEM Substrate Analysis Energy dispersive X-ray spectroscopy Composition Crystal Structure STEM Scanning Transmission electron microscopy

Control Pure platinum TEM grid substrate Composition: Pt Crystal Structure: Face Center Cubic (FCC)

Pt Image

Bragg Diffraction Constructive Interference Destructive Interference Patterns of high and low intensities due to constructive and destructive interference of the incident beam (gives spacing in the crystal structure) Constructive Interference Destructive Interference

Branton Campbell's work FCC Peaks Super lattice peaks

Super lattice peaks

Co-Sputtering Platinum and Cadmium Very little Cadmium Substrate: More Cadmium More Platinum Co-Sputtering Platinum and Cadmium Very little Cadmium Substrate: TEM Grids Composition ratio: ~1 Cd : 3Pt on Cd rich side.

Results ~3 Pt : 1 Cd ratio was achieved. Were not able to detect any of the super lattice peaks.

L13 Where are you?

Continuing the Search Grow thicker sample and subject to bulk x-ray analysis ~8 μm thick Look for super lattice peaks. Check for Composition using EDAX and crystal structure using STEM.

Special thanks to : NSF Richard Vanfleet Jeff Farrer Liz Strein Branton Campbell Pictures borrowed from: www.gildergrids.co.uk/g100-moly-150.gif Dr. Hart www.tulving.com/bullion/CanadianMapleLeaf9995.jpg Wikipedia www.moosecreekforge.com/index2.html commons.wikimedia.org/wiki/Image:Magnetrongun.jpg www.microscopy.ethz.ch/bragg.htm www.nanocenter.umd.edu/new_facilities/NispLab.php www.microscopy.ethz.ch/images/ED_Pt.jpg www.gfe.rwth-aachen.de/seiteninhalte_english/geraete.htm