Multiferroic Pb1-xSrx(Fe0.012Ti0.988)O3 nanoparticles: Room temperature dielectric relaxation, ferroelectricity and ferromagnetism

摘要

The effect of particles size and lattice parameters on dielectric constant, ferroelectricity, ferromagnetism and dc resistivity of Pb1-xSrx(Fe0.012Ti0.988)O3 (PSFT) nanoparticles has been studied at room temperature. The PSFT nanoparticles were prepared by a chemical synthesis route. The X-ray diffraction patterns confirm the phase structure of PSFT nanoparticles. The tetragonal distortion (c/a) and particles size have been reduced with increasing Sr2+ ion substitution. The microstructural behaviour shows the average particle’s size of PSFT specimens which lie in the range of 4-13 nm. The Sr-doped PSFT specimens show higher value of dielectric constant than undoped PFT. At 30 mol% of Sr concentration, the PSFT specimen shows dielectric relaxation up to 18 MHz with ε = 101 and tan '/image/spc_char/delta1.gif' border=0 = 0.075. Also, the maximum value of saturation magnetization, Ms = 64.4×10-3 emu/g with low magnetic coercive field, Hc = 35.9 Oe, and spontaneous polarization, Ps = 20.7 μC/cm2, remanent polarization, Pr = 13.3 μC/cm2 and electric coercive field, Ec = 5.7 kV/cm have been observed. Compositional plots between average particle’s size and dc resistivity, and dielectric constant and saturation magnetization have been given.