Heavy-ion beam heated tantalum and tungsten near meltingстатья

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[1] Heavy-ion beam heated tantalum and tungsten near melting / D. N. Nikolaev, A. A. Fedenev, A. D. Fertman et al. // High Temperatures - High Pressures. — 2011. — Vol. 40, no. 3-4. — P. 281–290. At the GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Darmstadt, Germany) intense focused beams of energetic heavy ions are used to generate high-energy-density states in matter [1]. In recent experiments, initially solid tantalum and tungsten samples (50-90 mu m thick foils) were uniformly heated in a quasi-isobaric way by a microsecond ion-beam pulses. The temperature of a sample has been observed by a fast multi-channel optical pyrometer during and after the heating. The isobaric heat capacity of the melted metals as well as the enthalpy of fusion have been obtained from the temperature - enthalpy dependence, calculated from measured temperature-time data. A good measurement statistics has been achieved by carrying out a large number of the same experiments with identical targets. The obtained experimental results for liquid tantalum and tungsten heated up to 5000 K are presented and discussed.

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