硫酸钾的固态相变
The solid state phase transformation of potassium sulfate
摘要：
从水溶液中生长的硫酸钾单晶在第一次加热时损失高达1%的质量，假定为水。这种质量损失发生在附近的PT从斜方晶系到六方晶系K2 SO 4。只有在尚未释放水的K2 SO 4的第一次加热运行中，才能在DTA曲线中观察到预过渡热效应。如果K2 SO 4晶体从含有4 wt.% Cd、Cu或Fe，只有Cu或Fe可以显著结合，浓度为0.1%。对于这种固溶体测量的相变温度取决于加热速率。对于纯K_2SO_4，相变温度与升温速率无关581.3 ℃。相变焓为（5.8 ± 0.2）kJ/mol。
英文摘要：
Potassium sulfate single crystals that are grown from aqueous solutions lose upon the first heating up to 1% of mass that is assumed to be water. This mass loss occurs in the vicinity of the PT from orthorhombic to hexagonal K2SO4. Only in the first heating run of K2SO4 that has not yet released water, pretransitional thermal effects can be observed in the DTA curve. If K2SO4 crystals are grown from solutions containing 4 wt.% Cd, Cu, or Fe, only Cu or Fe can be incorporated significantly with concentrations of several 0.1%. The phase transformation temperature measured for such solid solutions depends on the heating rate. For pure K2SO4, the phase transformation temperature is independent on heating rate 581.3 deg. C and the enthalpy of transformation is (5.8+/-0.2) kJ/mol.
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