The specific volumes of Pd40Ni40P20 in the liquid, glass, and crystallized states
The specific volumes of Pd40Ni40P20 in the liquid, glass, and crystallized states
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DOI：
10.1063/1.355286
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发表时间：
1993-11
影响因子：
3.2
通讯作者：
K. Chow;S. Wong;H. Kui
中科院分区：
文献类型：
--
作者：
K. Chow;S. Wong;H. Kui
测定了液态、玻璃态和结晶态下Pd40Ni40P20的比容。结果发现，在熔融状态下，温度低于~ 1000 K时，只有对样品进行适当纯化，比容测量才能成功。这种纯化可以通过在脱水氧化硼中熔炼熔融试样来实现。观察到弛豫效应，这种弛豫效应表现为热膨胀系数随猝灭速率的变化。液体（稳定和亚稳）、玻璃和结晶的比体积曲线交点分别为573±80 K和492±80 K（外推值）。前者与量热法得到的577 K的玻璃化转变温度非常吻合，而后者根据自由体积理论表明，熔体在达到该温度之前就会坍缩到玻璃化。
The specific volumes of Pd40Ni40P20 were measured in the liquid, glass, and crystallized states. It was found that in the molten state, for temperatures below ∼1000 K, the specific volume measurement was successful only if the specimens were properly purified. Such purification could be achieved by fluxing the molten specimen in dehydrated boron oxide. Relaxation effects are observed and they manifested themselves in the variation of the thermal expansion coefficient with the quenching rates of the glassy specimens. The intersection points of the specific volume curves of the liquid (both stable and metastable), glass and crystallized are 573±80 and 492±80 K (extrapolated values), respectively. The former agrees very well with the glass transition temperature 577 K, obtained by the calorimetry method, while the latter implies that the melt, in accord with free volume theory, will have collapsed to the glass before that temperature is reached.