Key points are not available for this paper at this time.
By means of the quadratic magnetoelectric effect the components of the non-linear magnetoelectric susceptibility tensor β i j k of the antiferromagnetic ferroelectric ferroelastic phase of BiFeO 3 have been determined at 4 K: β₁11 =5. 0·10^-19sA^-1, β₁13=8. 1·10^-19sA^-1, β₃11 =0. 3·10^-19sA^-1, β₃33=2. 1·10^-19sA^-1
Tabares‐Muñoz et al. (Tue,) studied this question.