应用反应速率分析方法,在高真空金属系统中测定了金属铀在恒容体系和150~300℃范围内吸收氘和氚的p-t曲线.由p-t曲线可知,在同一温度下,铀吸氚的速率与铀吸氘的速率基本相同;而随着温度的升高,由于解吸逆反应的影响,铀吸氚(氘)的反应速率降低.根据p-t曲线计算了吸气反应在不同温度的速率常数,得到铀吸氘和氚的表观活化能分别为(-42.8±0.3)和(-43.2±1.2) kJ·mol-1.从活化能数据可以看出,铀吸氘和氚的反应动力学同位素效应不明显.
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