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Polymerization of Formic Acid under High Pressure
Phys. Rev. Lett. 94, 065505 (2005)
Alexander F. Goncharov,1 M. Riad Manaa,1 Joseph M. Zaug,1 Richard H. Gee,1 Laurence E. Fried,1 and Wren B. Montgomery2
1Lawrence Livermore National Laboratory, University of California, Livermore, California 94551, USA 2Department of Planetary Sciences, University of California, Berkeley, California 94720, USA
We report Raman, infrared, and x-ray diffraction (XRD) measurements, along with ab initio calculations on formic acid (FA) under pressure up to 50 GPa. We find an infinite chain Pna21 structure to be a high-pressure phase at room temperature. Our data indicate the symmetrization and a partially covalent character of the intrachain hydrogen bonds above approximately 20 GPa. Raman spectra and XRD patterns indicate a loss of long-range order at pressures above 40 GPa, with a large hysteresis upon decompression. We attribute this behavior to a three-dimensional polymerization of FA. The American Physical Society
Highlighted by Nature 434, 36 (03 March 2005)
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