Holmium(III) oxide

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What Wikipedia says

Holmium(III) oxide, or holmium oxide is a chemical compound of the rare-earth element holmium and oxygen with the formula Ho2O3. Together with dysprosium(III) oxide (Dy2O3), holmium oxide is one of the most powerfully paramagnetic substances known.

Excerpt from the Wikipedia article “Holmium(III) oxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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