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Science 5 March 1999:
Vol. 283. no. 5407, pp. 1510 - 1513
DOI: 10.1126/science.283.5407.1510
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Reports

Quartzlike Carbon Dioxide: An Optically Nonlinear Extended Solid at High Pressures and Temperatures

V. Iota, C. S. Yoo, * H. Cynn

An extended-solid phase, carbon dioxide phase V (CO2-V), was synthesized in a diamond anvil cell by laser heating the molecular orthorhombic phase, carbon dioxide phase III, above 40 gigapascals and 1800 kelvin. This new material can be quenched to ambient temperature above 1 gigapascal. The vibration spectrum of CO2-V is similar to that of the quartz polymorph of silicon dioxide, indicating that it is an extended covalent solid with carbon-oxygen single bonds. This material is also optically nonlinear, generating the second harmonic of a neodymium-yttrium-lithium-fluoride laser at a wavelength of 527 nanometers with a conversion efficiency that is near 0.1 percent.

Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, USA.
*   To whom correspondence should be addressed. E-mail: yoo1{at}llnl.gov

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