[3] In modern research, thin films can be manufactured by molecular beam epitaxy directly from europium atoms and oxygen molecules.

[4][5] Europium(II) oxide is a violet compound as a bulk crystal and transparent blue in thin film form.

[3] EuO crystallizes in a cubic sodium chloride structure with a lattice parameter a = 0.5144nm.

[citation needed] Europium(II) oxide is ferromagnetic with a Curie Temperature of 69.3 K. With the addition of about 5-7% elemental europium, this increases to 79 K.[2] It also displays colossal magnetoresistance, with a dramatic increase in conductivity below the Curie temperature.

[6] Europium(II) oxide is a semiconductor with a band gap of 1.12 eV.