| prov:value
| - ferrimagnetic filler comprising spinel ferrite having the general formula (AaO)1-x(BbO)xFe2O3, where Aa and Bb are divalent metal cations comprising Ba, Cd, Co, Cu, Fe, Mg, Mn, Ni, Sr or Zn, and x is a fractional number on the interval [0,1), and/or a ferro-electric filler comprising perovskite titanate of the type (CcO) TiO2, or a zirconate of the type (CcO)ZrO2, where Cc is a divalent metal cat
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