| Summary: | NaClO<sub>3</sub> and NaBrO<sub>3</sub> are believed to form a complete solid solution from RT to fusion. The unique solid phase can thus be written: NaClO<sub>3(1−x)</sub>-NaBrO<sub>3(x)</sub> with: 0 ≤ x ≤ 1. This study shows that at high temperatures, this statement might be valid. Nevertheless, up to 50 °C, probably up to 160 °C, and even higher temperatures, this is not true when the system is in thermodynamic equilibrium. A large miscibility gap exists at room temperature (RT). This gap could be reduced up to a complete disappearance by fast crystallization, for instance, spray-drying. The necessary conditions to access equilibrium, including homochirality, are also discussed.
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