Abstract
Sound propagation in the molten alkali nitrate single salts, LiNO3, NaNO3, RbNO3 and CsNO3 and the binary melts, NaNO3–LiNO3, −RbNO3 and −CsNO3, have been studied over the frequency range of 5–25 Mhz and 3–8 GHz by means of pulse and Brillouin scattering methods, respectively. A dispersion of sound propagation is observed at the frequency between ultra- and hyper-sound region for KNO3, RbNO3 and CsNO3. The thermodynamic properties derived from the sound velocity are approximately additive for the binary melts investigated. The bulk viscosity, ηB was derived from the absorption coefficient determined. The value of ηB/dT is negative and temperature dependence of ηB/ηS is insignificant for the molten alkali nitrate single salts. The bulk viscosity of the binary melt decreases rapidly with the addition of the component having smaller bulk viscosity in pure salt.
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