Influence of magnetic fields on the Curie temperature of the some perovskite type ferroelectrics and antiferroelectrics

Influence of the external magnetic fields on the Curie temperature Tc of the ferroelectrics(FE): BaTiO3, Pb(Sc1/2Nb1/2)O3, Pb(F1/2Nb1/2)O3, Bi0.4Pb0.6(Fe0.7Nb0.3)O3, and antiferroelectrics(AFE) PbZrO3 and Bi0.7La0.3FeO3 has been investigated. The prediction of the vibronic theory of ferroelectricity of a displacement of Tc in the magnetic fields has been confirmed. It was found that in the magnetic fields an increase of the Curie temperature of the ferroelectrics takes place (ΔTc > 0). For the first time displacement of the antiferroelectric Tc in the magnetic field was observed, and it was shown that contrary to FE, in AFE crystals the magnetic field lowers the Curie temperature (ΔTc > 0).