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1994 (1)
1Author    E. Rejek, J. Richter, A. Stark, M. VogtRequires cookie*
 Title    Ultrasonic Velocity and Absorption in 3 Melts Measured by the Pulse Transmission Method  
 Abstract    (L i,A g)N 0 3, (N a,A g)N O a, (K ,A g)N 0 3, (C s,A g)N 03, (L i,R b)N 0 3, and (N a ,R b)N 0 Ultrasonic velocity and absorption have been measured in molten (L i,A g)N 0 3, (N a,A g)N 03, (K ,A g)N 0 3, (Cs,A g)N03, (L i,R b)N 0 3, and (N a,R b)N 0 3 as functions of composition in the tem­ perature range 230 to 300 °C. An improved pulse transmission device was applied. The obtained accuracy was 2%o for the velocity and 2-4% for the absorption data. The ultrasonic velocity and absorption coefficient (25 MHz) were found to depend linearly on temperature. The dependence of the velocity on the mole fraction could be represented by a cubic polynomial. For the absorption values (referred to the square of frequency) a reasonable general dependence on composition could not be given. The adiabatic compressibility of all mixtures has been calculated from the measured sound velocity. The ratio bulk/shear viscosity and the bulk viscosity itself follow from the measured absorption values together with the velocity values. The conclusion from these data is that ultrasonic absorption in the six investigated systems is governed by the bulk viscosity and that structural rearrangements rather than structural relaxation of the molecules, are the reason for high bulk viscosities in ionic melts. 
  Reference    Z. Naturforsch. 49a, 481—489 (1994); received November 15 1993 
  Published    1994 
  Keywords    Molten salts, Thermophysical properties, Ultrasonic velocities and absorption, Pulse transmission method 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0481.pdf 
 Identifier    ZNA-1994-49a-0481 
 Volume    49