METHOD FOR PREPARING PYROELECTRIC SINGLE CRYSTAL

摘要

Disclosed is a method for preparing a large-size high-homogeneity manganese-doped pyroelectric single crystal. The chemical composition of the manganese-doped pyroelectric single crystal is as follows: Mn-(1-x-y)Pb(In1/2Nb1/2)O3-yPb(Mg1/3Nb2/3)O3-xPbTiO3, wherein x＝0.35-0.42, y＝0.30-0.45, and 1-x-y＝0.20-0.29. The doping amount of Mn is 0-5%. The preparation method for the material is an improved Bridgman method, which comprises raw material synthesis, seed crystal selection, growth process control, defect regulation and control, etc. The present invention overcomes the disadvantages in the prior art that it is difficult to dope the Mn element, the crucible easily leaks, and a defect is easily generated in the [001] direction, and provides an implementation method for the industrial growth of large-size pyroelectric single crystals.