Abstract
Single crystals of aluminum substituted barium hexaferrite were grown by the floating zone method with optical heating. Single crystals were produced from a melt of stoichiometric composition. The process was carried out under a pressure of 50atm of oxygen. In the system BaO–(x)Al2O3–(6−x)Fe2O3 the region of single phase crystal growth from the melt is limited by the value x=3. For higher substitutions single-phase crystallization is not observed. The grown single crystals are cylindrical boules with a diameter of 4–5mm and with lengths up to 50mm. To avert cracking the crystals have been annealed during the process of growth at 1100°C. The content of FeO in the composition of single crystals of barium hexaferrite, grown by zone melting under an oxygen pressure of 50atm, is approximately 0.3wt%. In the system of hexaferrite–aluminates the macroscopic magnetic moment of the material disappears at x=3.
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