M. A. Zocher

Publications (2)1.03 Total impact

• Article: Study of cerium phase transitions in shock wave experiments

  M. V. Zhernokletov, A. E. Kovalev, V. V. Komissarov, M. G. Novikov, M. A. Zocher, F. J. Cherne
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  ABSTRACT: Cerium has a complex phase diagram that is explained by the presence of structural phase transitions. Experiments to measure the sound velocities in cerium by two methods were carried out to determine the onset of cerium melting on the Hugoniot. In the pressure range 4–37 GPa, the sound velocity in cerium samples was measured by the counter release method using manganin-based piezoresistive gauges. In the pressure range 35–140 GPa, the sound velocity in cerium was measured by the overtaking release method using carbogal and tetrachloromethane indicator liquids. The samples were loaded with plane shock wave generators using powerful explosive charges. The onset of cerium melting on the Hugoniot at a pressure of about 13 GPa has been ascertained from the measured elastic longitudinal and bulk sound velocities.
  Journal of Experimental and Theoretical Physics 05/2012; 112(2):212-219. · 1.03 Impact Factor
• Article: Measurement of sound velocities and shear strength of cerium under shock compression

  M V Zhernokletov, A E Kovalev, V V Komissarov, M G Novikov, M A Zocher, F J Cherne
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  ABSTRACT: Sound velocity in shock-compressed cerium was measured over the pressure range of 35-140 GPa using the rarefaction overtake technique. Indicator liquids carbogal and tetrachloromethane were used. The samples were loaded with planar shock wave generators using powerful high explosives (HE). Luminescence of the liquid indicators was recorded by optical gauges based on photodiode 'FD 256'. For the pressure range of 13-35 GPa, sound velocity was measured in cerium samples using the counter release method with manganin-based piezoresistive gauges. From the measured longitudinal and bulk sound velocities, Poisson's ratio and shear strength of cerium were determined. The melting boundary on the shock Hugoniot was estimated. Experimental data is compared with calculation results.
  Journal of Physics Conference Series 07/2008; 121(7):072003.