期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 83, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4730595
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SG0001057]
A new method for measuring melting temperatures in the laser-heated diamond cell is described. This method circumvents previous problems associated with the sample instability, thermal runaway, and chemical reactions. Samples were heated with a single, 20 milliseconds rectangular pulse from a fiber laser, monitoring their thermal response with a fast photomultiplier while measuring the steady state temperature with a CCD spectrometer. The samples were recovered and analyzed using scanning electron microscopy. Focused ion beam milling allowed to examine both the lateral and the vertical solid-liquid boundaries. Ambient pressure tests reproducibly yielded the known melting temperatures of rhenium and molybdenum. Melting of Re was measured to 50 GPa, a 5-fold extension of previous data. The refractory character of Re is drastically enhanced by pressure, in contrast to Mo. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4730595]
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