论文部分内容阅读
对Cd-Sb体系高压下的非品形成过程进行了研究,并详细地从理论上分析了压力对冷却过程的形核自由能、临界冷速的影响。发现高压亚稳相的形成是非晶形成的先决条件,而一般只有那些体积随着温度的升高而减小的体系能形成高压亚稳相。对于此类体系,压力能促进形核,抑制生长,极大地降低临界冷却速度,从而促使高压亚稳相的形成。另外,高压亚稳相的形成存在一临界压力,压力必须大于临界压力方可形成亚稳相。最后,高压亚稳相由于动力学条件的抑制而转变为非晶。
The non-product formation process under high pressure of Cd-Sb system was studied, and the effect of pressure on the nucleation free energy and critical cooling rate of the cooling process was analyzed theoretically in detail. It was found that the formation of high-pressure metastable phases is a prerequisite for the formation of amorphous forms, whereas generally only those systems whose volume decreases with increasing temperature form a high-pressure metastable phase. For such systems, pressure can promote nucleation, inhibit growth, greatly reduce the critical cooling rate, which led to the formation of high-pressure metastable phase. In addition, the formation of high-pressure metastable phase there is a critical pressure, the pressure must be greater than the critical pressure to form a metastable phase. Finally, the high-pressure metastable phase changes to amorphous due to the inhibition of kinetic conditions.