论文部分内容阅读
Differential scanning calorimeter combined with flux(dehydrated B2O3) processing was used to realize and precisely measure the undercooling of germanium melts.The highest undercooling obtained in this way was 190 K.Relations between the undercooling and cooling rate or overheating tem-perature are analyzed respectively.The undercooling obtained is found to be increased with increasing of the cooling rate in the range from 5 to 40 K/min.At a given cooling rate,the undercooling reached is increased with the increasing of the overheating temperature of the melt,but tends to be constant at last.Crystallization of the undercooled germanium melt is investigated at the same time.It is clearly shown that,the higher the cooling rate,the shorter time is needed for crystallization.
Differential scanning calorimeter combined with flux (dehydrated B2O3) processing was used to realize and precisely measure the undercooling of germanium melts. The highest undercooling obtained in this way was 190 K. Relationslations of the undercooling and cooling rate or overheating tem-perature are The undercooling obtained is found to be increased with increasing of the cooling rate in the range from 5 to 40 K / min. At a given cooling rate, the undercooling reached is increased with the increasing of the overheating temperature of the melt, to be constant at last. Crystallization of the undercooled germanium melt is investigated at the same time. It is clearly shown that the higher the cooling rate, the shorter time is needed for crystallization.