We have investigated the multiferroic properties of PbTiO3 substituted on the A-site with Sm3+ and Fe2+ magnetic ions. We show that the ceramic material with composition (Pb0.845Sm0.08Fe0.035)(Ti0.98Mn0.02)O3 has a spontaneous ferroelectric polarization of about 14 ?C/cm2 and weak ferromagnetism (remanent magnetization ?2.3 emu/g) which persists even at room temperature. The dielectric constant is 190, tan ? ? 0.005, and the piezoelectric g33 constant is 25 mV × m/N. Temperature dependence of dielectric permittivity shows a strong anomaly at 662 K, at the paraelectric-ferroelectric transition, and a broader anomaly below 140 K where magnetization also increases, probably due to magnetoelectric coupling between ferroelectric and magnetic states.
Multiferroic perovskite (Pb0.845Sm0.08Fe0.035)(Ti0.98Mn0.02)O3 with ferroelectric and weak ferromagnetic properties
2013
Abstract
We have investigated the multiferroic properties of PbTiO3 substituted on the A-site with Sm3+ and Fe2+ magnetic ions. We show that the ceramic material with composition (Pb0.845Sm0.08Fe0.035)(Ti0.98Mn0.02)O3 has a spontaneous ferroelectric polarization of about 14 ?C/cm2 and weak ferromagnetism (remanent magnetization ?2.3 emu/g) which persists even at room temperature. The dielectric constant is 190, tan ? ? 0.005, and the piezoelectric g33 constant is 25 mV × m/N. Temperature dependence of dielectric permittivity shows a strong anomaly at 662 K, at the paraelectric-ferroelectric transition, and a broader anomaly below 140 K where magnetization also increases, probably due to magnetoelectric coupling between ferroelectric and magnetic states.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
