“…Various external fields have been proved to successfully promote solute diffusion and nucleation in crystallization of highly viscosity systems, such as ultrasonic irradiation [29] , [30] , [31] , shear [32] , [33] , [34] , magnetic field [35] , [36] , laser [37] and so on. Among these, ultrasonic irradiation as a simple and effective method has been used by CAEP to address the above issue.…”