What aspects should be considered to evaluate the stability of solids at high temperatures?
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Dear sea friends, I want to study the stability of a solid substance (an inorganic material) at high temperatures. What aspects should I consider? ? What else is there besides oxidizing property? Thank you!
What temperature is considered high? 1000 degrees? From what I understand: generally, at high temperatures, complex compounds tend to decompose into simpler compounds; for example, CaCO3 → CaO. Metal oxides tend to exist in lower oxidation states, such as Fe2O3 → Fe3O4 → FeO. Specific values for this phenomenon are not commonly available; perhaps it is possible to analyze the situation by calculating the enthalpy of formation at different temperatures. For instance, for the reaction CaCO3 → CaO, the temperature at which the enthalpy of formation is zero can be considered as a point where the two substances coexist, representing a clear turning point.
What if it can’t be broken down? For example, aluminum chloride (as far as I know, it doesn’t decompose. . ) What does such a substance examine? Thank you
For something like this, it’s necessary to look up information; you can’t just assume things. At least as far as I know, the molecular formula of aluminum chloride at lower temperatures is Al2Cl6, while it is AlCl3 at higher temperatures