Bridgman growth of Rb₂MnCl₄ via accelerated crucible rotation technique

The Accelerated Crucible Rotation Technique (ACRT) was applied to the Bridgman growth of (incongruently melting) Rb₂MnCl₄ from non-stroichiometric melts. ACRT mixing allowed us to increase the crystal growth rates by at least a factor of four compared to the maximum growth rate, in order to obtain inclusion-free crystals, without stirring. The existing analytical data do not allow a prediction of the optimum ACRT parameters and it is possible that even higher growth rates could still be achieved. The ACRT-induced changes of the fluid flow velocity past the growing face and of the thickness of the diffusion boundary layer were calculated.