Barium titanate as a ferroelectric material

Claim 1

THE METHOD OF PREPARING SINGLE CRYSTALS CONSISTING ESSENTIALLY OF BARIUM TITANATE, MODIFIED BY THE SUBSTITU TION, IN THE LATTICE STRUCTURE, OF IRON ATOMS FOR SMALL MINORITY OF THE TITANIUM ATOMS, WHICH COMPRISES MIXING BARIUM TITANATE WITH A POTASSIUM FLUORIDE FLUX IN THE PROPORTIONS OF ABOUT 40 PARTS OF THE TITANATE TO 100 PARTS OF THE FLUX BY WEIGHT, AND WITH FERRIC OXIDE IN AN AMOUNT SUCH AS TO INCORPORATED FROM 2 TO 100 IRON ATOMS PER 1,000 TITANIUM ATOMS, HEATING THE MIX TO A TEMPERATURE IN THE RANGE 1150*C. TO 1225*C., HOLDING SAID TEMPERATURE FOR A PERIOD SUFFICIENT TO MELT SAID FLUX AND TO DISSOLVE SAID TITANATE AND SAID OXIDE THEREIN, GRADUALLY COOLING THE MELT UNTIL CRYSTALLINE PLATES ARE FORMED AT THE BASE OF THE MELT, AND DECANTING THE LIQUID OVERLYING THE CRYSTALS.