Yttrium(II) oxide
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| Properties | |
| YO | |
| Molar mass | 104.9 g/mol | 
| Appearance | Dark brown solid | 
| Structure | |
| Tetragonal | |
| Related compounds | |
| Related compounds | Yttrium(III) oxide | 
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
Yttrium(II) oxide or yttrium monoxide is a chemical compound with the formula YO. This chemical compound was first created in its solid form by pulsed laser deposition, using yttrium(III) oxide as the target at 350 °C. The film was deposited on calcium fluoride using a krypton monofluoride laser. This resulted in a 200 nm flim of yttrium monoxide.