Ion beam sputtering with ion assisted deposition for coatings on chamber components

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An article comprises a body and a conformal protective layer on at least one surface of the body. The conformal protective layer is a plasma resistant rare earth oxide film having a thickness of less than 1000 μm, wherein the plasma resistant rare earth oxide has a composition of 40-45 mol % of Y2O3, 5-10 mol % of ZrO2, 35-40 mol % of Er2O3, 5-10 mol % of Gd2O3, and 5-15 mol % of SiO2.