Ultrasonic Absorption Coefficient in NaNO3-MNO3(M: Li,K,Rb,Cs) Binary Melts.

概要

論文の詳細を見る
The ultrasonic absorption coefficient, α in NaNO3-MNO3 (M: Li, K, Rb, Cs) binary melts has been measured by means of the pulse transmission method in the frequency range of 15-65MHz with the precisions of 5%. The values of αf-2 showed no frequency dependence for all binary melts. The bulk viscosity of binary melts determined from the absorption coefficient shows the negative temperature dependence. The bulk viscosities of NaNO3-KNO3, NaNO3-RbNO3 and NaNO3-KNO3 binary melts decrease steeply with increasing NaNO3 content at MNO3 (M: K, Rb and Cs) rich sides. A calculation based on the relaxation theory has been applied for bulk viscosity of the binary melts. The bulk viscosity of the mixture was calculated by using the values of isentropic compressibilities and bulk viscosities of the component salts. The calculated values agreed well with the experimental values. It has been concluded that the structural rearrangement in the binary melts is controlled by the motion of the constituent having cations with smaller size and corresponding the shorter relaxation time in pure component melt.
日本熱物性学会の論文