Abstract
The segregation of charged components during the solidification of a polycomponent melt in an electric field is investigated. It is shown that the electric potential changes the values of dopant distribution coefficients and system equilibrium temperature. The appearance of a crystallization electromotive force during the growth is described. Growth under stationary and pulsed currents from an external source is investigated. The theoretical relations for the sensitivity of chromium effective distribution coefficient to current density for the case of lithium niobate crystallization agrees with experimental data. Theoretical estimates give the value of order 0.2 cm 2/mA, while experimentally measured sensitivity is about 0.075 cm 2/mA. Doping modulation under the pulsed current is caused by the change of the effective distribution coefficient and equilibrium temperature, while the contribution of the Peltier phenomenon is negligible.
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