This Part of EN 725 describes a method for the determination of impurities in barium titanate powders, using inductively coupled plasma atomic emission (ICP-AES).
The method is applicable only to stoichiometric barium titanate. The maximum concentrations measured for each impurity are as follows:
- Sr: 4 000 ppm
- Ca: 500 ppm
- K : 200 ppm
- Na, Mg, Al, Fe, Nb: 100ppm
The minimum concentration or detection limits are from ppm to 5 ppm.