Lawrence Livermore National Laboratory



Hyunchae Cynn

Research Staff
Physics Division


 +1 925-422-3432


Research Interests

I like to apply new experimental capabilities to measure physical and chemical properties of materials at extreme conditions using a diamond anvil cell. Recent advances in synchrotron radiation technology have brought to the DAC community experimental capabilities beyond the usual P,T conditions to examine new physical, chemical, thermodynamic, and mechanical properties of materials at extreme conditions.

I spend most of my research effort collecting x-ray diffraction at various synchrotron facilities (SSRL, NSLS, ESRF, APS, Spring-8) to understand material behavior at high pressure and high temperature. The types of material that I am interested in studying range from simple molecular solids, metals and alloys to complicated silicates.

Selected Publications

  1. H. Cynn, J.E. Klepeis, C.S. Yoo, D.A. Young, "Osmium has the lowest experimentally determined compressibility", Phys. Rev. Lett. 88, 135701 (2002) [pdf]
  2. H. Cynn, C.S. Yoo, B.J. Baer, V. Iota, A.K. McMahan, M. Nicol, S. Carson, "Martensitic fcc-to-hcp transformation of xenon at high pressure", Phys. Rev. Lett. 86, 4552 (2001) [pdf] 
  3. H. Cynn, C.S. Yoo, S.A. Sheffield, "Phase transition and decomposition of 90% hydrogen peroxide at high pressures", J. Chem. Phys. 110, 6836 (1999) [pdf]
  4. H. Cynn, C.S. Yoo, "Equation of State of Tantalum to 174 GPa", Phys. Rev. B 59, 8526 (1999) [pdf]
  5. H. Cynn, O.L. Anderson, D.G. Isaak, and M. Nicol, "Grüneisen ratios of MgO from the calculation of entropy", J. Phys. Chem. 99, 7813-7818 (1995)

    H. Cynn and A.M. Hofmeister, "High pressure IR spectra of lattice modes and OH vibrations in Fe-bearing wadsleyite", J. Geophy. Res. 99, 17717-17727 (1994)
  6. H. Cynn, O.L. Anderson, and M. Nicol, "Effects of cation disordering in a natural MgAl2O4 spinel observed by rectangular parallelepiped ultrasonic resonance and Raman measurements", Pure and Appl. Geophys. 141, 415-444 (1993)

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