Abstract
A study of the phase relations in the system Fe2O3B2O3 to aid in finding the optimum conditions to grow single crystals of iron borate was made. The compositions of the system Fe2O3B2O3 studied were with 20, 30, 40, 50, 60, 70 and 80 mole% of Fe2O3, at temperatures of 670, 800, 860 and 900°C. At all compositions and at low temperatures (670−800°C), FeBO3 is the prevalent stable phase. FeBO3 is stable up to 800°C for 0.25 ≤ Fe2O3/B2O3 ≤ 2.6. At 750°C and for 1 ≤ Fe2O3/B2O3 ≤ 2.6, two phases are present, FeBO3 and Fe3BO6. When Fe2O3/B2O3 > 2.6, FeBO3 disappears and Fe3BO6 and α-Fe2O3 are found. Thus, FeBO3 is obtained at low temperatures and with an excess of B2O3. Single crystals of borate FeBO3 with maximum dimensions of up to 8 mm are obtained from the flux with a mixture containing 1 Fe2O35 B2O31 Bi2O3. To avoid the formation of α-Fe2O3 and Fe3BO6, the mixture was cooled rapidly between 1135 and 860°C.
Published Version
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