APPEARANCE OF A BAROCLINIC WAVE IN CZOCHRALSKI SILICON MELT

Temperature fluctuations of a Si melt in a Czochralski crucible are me asured. Spectral analysis revealed that a baroclinic wave occurred abo ve a certain crucible rotation rate. Above the critical condition, the temperature fluctuation increased abruptly in amplitude. The fluctuat ion involved a characteristic frequency component that did not coincid e with the period of the crucible rotation. Examination of phase diffe rences among the data measured at different point revealed that the pe riodic motions were the result of azimuthal propagation of a temperatu re pattern. Experimental conditions based on the thermal Rossby number yielded wave motion which agrees with the theoretical value according to the theory of baroclinic instability.