Abstract
Nd 2− x Ce x CuO 4 crystals have been grown by the TSFZ process at an oxygen partial pressure in the growth atmosphere of about 2.0, 0.2 and 0.1 atm. The corresponding values of the cerium effective distribution coefficient are 9.1, 3.4 and 2.4. It has been found that the Ce concentration in the central part of the crystals is slightly lower than that in the peripheral part, although the average Ce concentration has the same value as that in the feed rods. This phenomenon is discussed from the point of view of the different stirring conditions in the corresponding parts of the molten zone. The difference in the Ce concentration between the central and peripheral parts of the crystals becomes lower at decreased oxygen partial pressure in the growth atmosphere. Optimization of the growth conditions at the air atmosphere (oxygen partial pressure 0.2 atm) is pointed out as the promising way for quality improvement of the Nd 2− x Ce x CuO 4 single crystals.
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