Hydrothermal synthesis and magnetic properties of multiferroic rare-earth orthoferrites

Influence of Cr substitution on structural, magnetic and electrical conductivity spectra of LaFeO3

“…The region I of LaFe 0.7 Cr 0.3 O 3 and LaFe 0.5 Cr 0 5. O 3 were independent of frequency, which gets thermally activated on increases in temperature.The dc activation plot of LaFe 0.7 Cr 0.3 O 3 and LaFe 0.5 Cr 0.5 O 3 are 0.176 and 0.35 eV, this is due to the role of Cr ions, which induce hole carriers Cr +4 in the grain boundary[21,32] and an increases in the conductivity and a high value of activation energy for LaFe 0.5 Cr 0.5 O 3 may be due to the reduced particle size and these activation energy values 0.24, 0.176 and 0.35 eV signifies the polaronic hole conduction behaviour caused by Cr substitution[20,30].…”

“…Rare-earth orthoferrites possess antiferromagnetic (AFM) property with Neel temperature (T N ) ranging from 620 K to 750 K [5,6]. Among the various rare-earth orthoferrites, the Lanthanum ferrite (LaFeO 3 ) has a distorted pervoskite (ABO 3 ) structure of the orthorhombic unit cell (a ≠ b ≠ c, α,β and γ = 90) and a space group of Pbnm, with a high Neel temperature, T N = 750 K [6].…”

Hydrothermal synthesis and magnetic properties of Fe3+-doped multiferroic hexagonal rare-earth manganates

“…9 gives the ZFC and FC magnetization curves of ErMnO 3 under 2-350 K. A small transition at 81 K was observed on the curve, and it was more obvious on the 1/M$T curve as shown in the embedded figure. The AFM transition temperature T N was determined to be 81 K. [31]. It is obvious that, Fe 3+ doping has elevated the T N of YbMnO 3 and LuMnO 3 .…”

“…Er 3+ is just at the ''crossroad'' of forming into hexagonal or orthorhombic structures. As we reported previously [31], single-phased orthorhombic ErFeO 3 was synthesized via the low-temperature hydrothermal technique. We speculate that Fe 3+ doping here promoted the formation of orthorhombic structure.…”

Manganese substitution effects in SmFeO3 nanoparticles fabricated by self-ignited sol–gel process

“…Recently, a number of methods have been used to prepare ultrapure and ultrafine ReFeO 3 nanoparticles, such as high-energy ball milling [6], solid-state reaction [14], thermal decomposition [15], sonochemical method [16], hydrothermal process [17], and self-ignited sol-gel method [18]. The structure and properties of these materials are strongly influenced by the synthesis processing of its precursor particles, so much attention has been paid on the improvement of preparation method.…”