Dysprosium oxide (Dy2O3) is a sesquioxide compound of the rare earth metal dysprosium.

It is a pastel yellowish-greenish, slightly hygroscopic powder having specialized uses in ceramics, glass, phosphors, lasers, dysprosium metal halide lamps, and as a Faraday rotator.

[3] It can react with acids to produce the corresponding dysprosium(III) salts:

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