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Chris Tulk, SNS

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New high P-T devices for neutron diffraction

Hydrogen-dominated materials will be studied by neutron diffraction at SNS (Oak Ridge). Two new type diamond cells will be developed : a) “belt”-type diamond cell with sample volumes of about ½ mm3 ; b) DAC with modified culets with neutron diffraction capabilities to near 1 Megabar.

"belt"-type large volume diamond cell



Hydrogen at High P-T Conditions

Study of the phase diagram of hydrogen above one megabar using modified anvil designs with enhanced chemical resistance (with C.S. Zha). An Excimer laser is used to cut dishes into the culets of the diamond anvils, which will then partly be filled with a material that reduces the chemical/physical interaction between hydrogen and diamond.


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