Quantitative determination of Eu 2+ and Eu 3+ content in (Eu,Y)-Si-Al-O-N glasses by magnetic measurements
This paper describes a method to determine the oxidation state of europium by means of magnetic measurements. The feasibility of this method is demonstrated using Eu-doped Y-Si-Al-O-N glasses as a model system. Magnetic measurements at (Eu,Y)-Si-Al-O-N glasses show that Eu is completely present as divalent ion for low Eu concentrations (Eu 0.152Y 15.0Si 14.7Al 8.7O 54.1N 7.4). At high Eu concentrations (Eu 15.2Si 14.7Al 8.7O 54.1N 7.4) a maximum of 5 at.% could be present as Eu 3+.