Ferromagnetism evidence and size dependence in ferroelectric PZN-4.5PT nanoparticles

Abstract

In this work we show the size-dependent ferromagnetic behavior of undoped and Mndoped PZN-4.5PT single crystals, consequently their multiferroic one. Undoped single crystals were tamisized and three different sizes powders were investigated showing a size dependence in such ferroelectric materials while no magnetism is observed for the non-oriented and oriented bulk single crystals. The results show the existence of an optimized grain sizes range (45 μm ≤ D ≤ 63 μm) in which the magnetism is the highest (around 0.08 emu/g). It is found that the maximum value of the relative strain decreases from 0.25% for undoped crystals to 0.20% for Mn-doped ones. The remanent magnetization Mr and coercivity (Hc) were found equal, respectively, to 2 × 10 −4 emu/g and 63 Oe for undoped and, 7 × 10 −4 emu/g and 66 Oe for Mn-doped PZN-4.5PT, indicating that PZN-4.5PT particles possessed weak ferromagnetic behavior. Mn doping increases highly the spontaneous magnetization from 7.5 × 10 −3 emu/g to 1.0 × 10 −3 emu/g, respectively for undoped and Mn-doped nanoparticles.

Realization of High Efficient Ferroelectric Perovskite Nanoparticles in Biopolymer-Matrix Solar Cells under Low Lighting

“…The PZN-PT single crystals were ground in a silicon carbide mortar to obtain perovskite nanopowders [8]. The biopolymer (CC) solution, which is the organic matrix in which the nanoparticles are dispersed, is obtained by organic extraction procedure.…”

“…Most recently, the inorganic PZN-PT perovskite materials have been investigated for their excellent and stable properties. This ferroelectric material shows other properties such as magnetism when reduced into nanopowder form [8]. PZN-PT single crystals showed properties up to 10 times more interesting than those of the ferroelectric perovskite ceramics currently used as actuators and sensors.…”