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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Phase barograms-phase diagrams of vapor pressure: Eutectoid phase formation in binary systems
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Phase barograms-phase diagrams of vapor pressure: Eutectoid phase formation in binary systems

机译：蒸气压的相图-相图：二元体系中共析相的形成

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摘要

Phase barograms are specific representations of conventional (x, T) phase diagrams considering the vapor pressure as additional thermodynamic parameter. Thus, the determination of the vapor pressure is complementary to conventional DTA or DSC measurements. A stringent relationship between the phase diagram and the corresponding phase barogram is derived by thermodynamic considerations of phase relations for complex heterogeneous equilibria. For that purpose, a derivative of the three-dimensional Clausius-Clapeyron equation is utilized. As a result, a validation of DTA/DSC measurements becomes feasible by the transformation of characteristic effects of vapor pressure measurements into thermal effects in conventional phase diagrams. The system CsBr/SeO _2 is presented as a case study of systems with a eutectoid phase formation. CsSeO _2Br is formed from the binaries at _f = 180(5)°C; the compound decomposes peritectically at _p = 470(10)°C.
机译：相柱状图是常规（x，T）相图的特定表示，将蒸气压作为附加热力学参数。因此，蒸气压的确定是对传统DTA或DSC测量的补充。相图和相应相柱状图之间的严格关系是通过对复杂非均质平衡的相关系的热力学考虑得出的。为此，利用了三维克劳修斯-克拉佩隆方程的导数。结果，通过将蒸汽压测量的特征效应转换为传统相图中的热效应，DTA / DSC测量的验证变得可行。提出了CsBr / SeO _2系统作为具有共析相形成系统的案例研究。 CsSeO _2Br由_f = 180（5）°C下的二元化合物形成;该化合物在_p = 470（10）°C时发生蠕变。

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