Speaker
Dr
Mikhail EREMETS
(Max Planck Institute for Chemistry)
Description
X-ray diffraction of weak scattering materials at megabar pressures
M. I. Eremets, I. A. Trojan, S. A. Medvedev, T. Palasyuk
We will present recent results on X-ray diffraction in combination with optical and electrical studies of light elements: sodium [1], nitrogen [2] [3], and compounds with hydrogen and nitrogen: SiH4 [4], HN3, N2H4, LiN3 and others at pressures up to about 200 GPa.
X-ray diffraction experiment with weak scaterers at multimegabar pressures is challenging, therefore it requires a special techniques which we are constantly developing. In particular, we use cBN/epoxy mixture as a gasket material [5]. It produces only a weak background and allows us to work with very small <10 m sample required for multimegabar range. In addition, this gasket provides an enhanced thickness of the sample. We further significantly increased the sample volume in 5 times with toroidal shaped diamond anvils [6].
1. Ma, Y., et al., Transparent Dense Sodium. Nature, 2009. 458: p. 182-185.
2. Eremets, M.I., A.G. Gavriliuk, and I.A. Trojan, Single-crystalline polymeric nitrogen. Appl. Phys. Lett. , 2007. 90: p. 171904.
3. Eremets, M.I., et al., Single-bonded cubic form of nitrogen. Nature Materials, 2004. 3: p. 558-563.
4. Eremets, M.I., et al., Superconductivity in Hydrogen Dominant Materials: Silane. Science 2008. 319: p. 1506-1509.
5. Eremets, M.I., et al., Superconductivity in boron. Science, 2001. 293: p. 272-274.
6. Trojan, I.A., et al., Transformation of molecular to polymeric nitrogen at high pressures and temperatures. In situ X-ray diffraction studies. Appl. Phys. Lett. , 2008. 93: p. 091907.
Primary author
Dr
Mikhail EREMETS
(Max Planck Institute for Chemistry)
Co-authors
Dr
Ivan Trojan
(Max Planck Institute for Chemistry)
Dr
Sergij Medvedev
(Max Planck Institute for Chemistry)
Dr
Taras Palasyuk
(Max Planck Institute for Chemistry)
