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Jung-Fu "Afu" Lin, University of Texas, Austin

Diamonds, Earth's Core and Mineral Field Trip

Fourth graders from Austin independent school district at U of TexasDr. Lin at UT Austin participated in the UTeach Outreach Program by leading a theme presentation and a lab tour, “UTeach Outreach: Diamonds, Earth's Core and Mineral Field Trip”, to ten groups of fourth graders from the Austin Independent School District (AISD).

Gas loading system built in UT-Austin

Jung-Fu Lin constructs gas loading system Univ. of Texas AustinAfu Lin and Roger Gary have successfully built a HP gas loading system at UT-Austin's Mineral Physics Lab. at the Jackson School of Geosciences. It is packed into a small cart for flexibility and safety.

In photo are Afu Lin and Roger Gary showing off their gas loading system.

Elasticity of the superhard materials

Gadolinium gallium garnet Gd3Ga5O12, or GGG, transforms to a virtually incompressible phase above 120 GPa shock pressures in recent shockwave experiments. Here UT postdoc fellow Dr. Zhu Mao and her collaborators have studied the crystal structure and the equation of state of a high-pressure phase in GGG using synchrotron X-ray diffraction in a laser-heated diamond anvil cell. Results show that Gd3Ga5O12, in a garnet structure at ambient conditions, was observed to transform to a high-pressure phase after laser-heating. We are in the process of refining the crystal structure.

 

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Developments of novel high-pressure and synchrotron X-ray probes

Synchrotron-based inelastic X-ray scattering (IXS) spectroscopies at third-generation synchrotron sources such as the Advanced Photon Source (APS), Argonne National Lab are becoming powerful tools to investigate materials properties at extreme pressures and temperatures (P-T). Of particular highlights is our recent development in the High-Energy Resolution IXS (HERIXS), with energy resolution of ~2 meV at Sector 3 of the APS, to study longitudinal acoustic (LA) phonon dispersions of hcp-Fe in an externally-heated DAC.

Fig4-HERIXS setup at Advanced Photon Source

 

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