METHOD OF DETERMINATION OF TEMPERATURE AND MOMENT OF START OF CRYSTALLIZATION OF SOLUTION-MELT Russian patent published in 1996 - IPC

FIELD: physicochemical analysis. SUBSTANCE: melt of element of III group is cooled and simultaneously moved along surface of crystal A″′B^vC with constant speed V_x.. Distance from edge of substrate to point of transfer of crystal solution into crystallization of solution-melt is registered and quantity of dissolved crystal A″′B^v. is determined. Temperature T of crystallization of solution- melt is found by equilibrium phase diagram and moment t_o of start of crystallization is calculated proceeding from speed V_x and length of solved surface of crystal A″′B^v. Repeat measurement is conducted for which additions of compound A″′B^v are injected into melt of element of III group in amount sufficient to form saturated solution-melt at temperature T. Solution-melt is moved again beginning from time moment V_x<V1x

≅L/2Δt, with speed A″′B^v, where L is length of crystal Δt in direction of movement; t_y= t_o-Δt is precision of determination of moment of crystallization. Moment of start of crystallization is found from relation , where L′ is distance from origin of crystal to boundary of region of transfer from solution up to crystallization during repeat movement of solution-melt; Δt is precision of determination of moment of start of crystallization during repeat measurement. EFFECT: increased accuracy of determination of moment of start of crystallization of solution-melt.