Germanium monoxide

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What Wikipedia says

Germanium monoxide (chemical formula GeO) is a chemical compound of germanium and oxygen. It can be prepared as a yellow sublimate at 1000 °C by reacting GeO2 with Ge metal. The yellow sublimate turns brown on heating to 650 °C. GeO is not well characterised.

Excerpt from the Wikipedia article “Germanium monoxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ShinRyu Forgers, CC BY-SA 4.0, via Wikimedia Commons.