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I'm searching for the products to the following reactions: $$\ce{CoO + MgO -> } \small\text{(cobalt pink)}$$ $$\ce{CoO + SnO -> } \small\text{(cobalt green)}$$

I know that corresponding reactions with Zinc Oxide ($\small\ce{ZnO}$) and Aluminium Oxide ($\small\ce{Al2O3}$) form Cobalt Zincate ($\small\ce{CoZnO2}$) and Cobalt Aluminate ($\small\ce{CoAl2O4}$).

Following the same logic, I'm guessing the product would be $\small\ce{CoMgO2}$, or something like that? I tried google, but it doesn't return anything for tin or magnesium.

There was vague mention of a deposit of $\small\ce{CoO}$ on $\small\ce{MgO}$ forming $\small\ce{CoO-MgO}$, is that the product?

Thanks!

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Are you sure that you mean $\ce{SnO}$ and not $\ce{SnO2}$?

Isn't it likely that the first will disproportionate under the conditions of a solid state reaction?

The latter, on the other hand, forms the cobalt stannate spinel $\ce{Co2SnO4}$, which is the main component in the classical pigment Cerulean blue.

Cobalt green, also known as Rinman's green is $\ce{CoZnO2}$.

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I wouldn't have thought they'ed react at all (maybe with massive amounts of heat). Regardless, in a Hypothetical situation, Cobalt Oxide and either the Tin or Magnesium oxide would under go the reaction:

CoO+XO⟶CoXO2

to form either CoMgO2 or CoSnO2.

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