86.
The binary phase diagram of KNO
3-KClO
3 is studied by means of differential scanning calorimetry (DSC) and high-temperature X-ray diffraction. The limited solid solutions, K(NO
3)
1−x(ClO
3)
x (0<
x<0.20) and K(NO
3)
1−x(ClO
3)
x (0.90<
x<1.0), were formed in the KNO
3-based solid solutions and KClO
3-based solid solutions phase, respectively. For KNO
3-based solid solutions, KNO
3 ferroelectric phase can be stable from 423 to 223 K as a result of substituting of NO
3 by ClO
3-radicals. The temperatures for solidus and liquidus have been determined based on limited solid solutions. Two models, Henrian solution and regular solution theory for KNO
3-based (α) phase and KClO
3-based (β) phase, respectively, are employed to reproduce solidus and liquidus of the phase diagram. The results are in good agreement with the DSC data. The thermodynamic properties for α and β solid solutions have been derived from an optimization procedure using the experimental data. The calculated phase diagram and optimized thermodynamic parameters are thermodynamically self-consistent.
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