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Chromium's Bonding Angles Let Oxygen Move Quickly

The result is a novel material with potential applications in fuel cell technology

August 2014

By taking advantage of the natural tendency of chromium atoms to avoid certain bonding environments, scientists have generated a material that allows oxygen to move through it very efficiently, and at relatively low temperatures. Specifically, they found that their attempts to make metallic SrCrO3 lead instead to the formation of semiconducting SrCrO2.8. Because chromium as an ion with a charge of +4 does not like to form 90-degree bonds with oxygen, as it must in SrCrO3, SrCrO2.8 forms instead with a completely different crystal structure. This material contains oxygen deficient planes through which oxygen can diffuse very easily.

To Protect and Serve

PNNL's Multiscale Graph Analytics Framework for cyber security featured at GraphLab Conference

August 2014
During GraphLab Conference 2014, Sutanay Choudhury, a research scientist with PNNL’s Data Sciences group (ACMD Division), hosted a demonstration showcasing M&Ms4Graphs, a graph analytics framework for cyber security. M&Ms4Graphs uses graph-theoretic models to provide continuous updates on system states as part of enabling a resilient (a system’s ability to function in the face of impediments) cyber infrastructure. The project is one of many backed by PNNL’s Asymmetric Resilient Cybersecurity Initiative and features a diverse team of computer scientists and mathematicians from both PNNL’s Fundamental & Computational Sciences and National Security directorates, including major contributors Peter Hui, Kiri Oler, Chase Dowling, Emilie Hogan, and Mahantesh Halappanavar.

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