Oxygen-releasing material at ≤ 200 °C [closed]








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I have to anneal a ceramic in high oxygen pressure, in an autoclave. For this purpose I need a chemical which can release oxygen at temperature less than or at 200 °C. Would appreciate any suggestion.


I am aware of $\ce{KClO3},$ but it seems that it releases $\ce{O2}$ at 300 °C.




Some ideas, looking around at some potassium salts:


* Potassium permanganate, $\ce{KMnO4}$: [decomposes at 240°C](https://en.wikipedia.org/wiki/Potassium_permanganate), probably the most readily available as I commonly see it in chemical laboratories.
* Potassium manganate, $\ce{K2MnO4}$: [decomposes at 190°C](https://en.wikipedia.org/wiki/Potassium_manganate). Tends to disproportionate with water, but can be made from the permanganate plus concentrated potassium hydroxide solution.
* Potassium ferrate, $\ce{K2FeO4}$: [decomposes at 198°C](https://en.wikipedia.org/wiki/Potassium_ferrate). Breaks down readily in the presence of water. Listed as "Danger" is the GHS safety classification.


All such compounds should be handled with care and especially avoiding contact with organic material which they may cause to combust.


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