Zr-Ti-Cu-Ni-Be大块非晶低温比热

LOW TEMPERATURE SPECIFIC HEAT ON BULK AMORPHOUS Zr-Ti-Cu-Ni-Be ALLOY

测量了Zr41 Ti1 4 Cu1 2 .5 Ni1 0 Be2 2 .5 大块非晶及不同退火条件的样品在液氦温区的比热 .低温下的比热数据可用电子比热和声子比热两部分的贡献来拟合 ,发现非晶的电子比热系数γ值比其他样品大 ,德拜温度从非晶到平衡相依次增大 ,并从电子态密度和德拜理论出发 ,初步解释了这种差异 .

Specific heat of the bulk amorphous Zr-Ti-Cu-Ni-Be alloy and different heat-treated samples has been measured in temperature range from 4.5 to 30K. The specific heat result can be well fitted by electronic and phonon contributions. The value of electronic specific coefficient gamma is much bigger than other samples and the Debye temperature Theta (D) increases regularly from amorphous to equilibrium crystallized phase. The different behaviors of different samples are interpreted primarily in terms of electronic density of states and Debye model.