| http://www.w3.org/ns/prov#value | - (III) Perovskites of the general formula (A1???aA???a)(BbB???1???b)O3???c, wherein A is selected from lanthanides, La, Y, Pb and mixtures thereof, A??? is selected from alkaline earth metals such as Ba, Ca, Sr and mixtures thereof, B is selected from transition elements such as Fe, Co, Cr, Ni and mixtures thereof, and B??? is selected from Al, Co, Cr, Mg, Nb, Ti, Zr and mixtures thereof, wherein 0
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