Multiferroic behavior of lanthanum orthoferrite (LaFeO3)

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO3−xBaTiO3 (0.0 ≤ x ≤ 0.25) solid solutions

“…The noted bond angle increases with increasing x, which indicate the doping of BaTiO 3 in LaFeO 3 reduce the unit cell volume and straightening Fe-O 1 -Fe bond angle. 3 Lattice parameters Crystallite size (nm) T 6, 1650031 (2016) which behaves as a weak temperature-dependent plateau with a high value ( > 2550) at RT, then it decreases stepwise to a flat value of 20 at 80 K. Worthwhile these observation are well agreed with previous reports by Chen et al 16 Further for x ¼ 0.10 (shown in Fig. 4(b)) solid solution also exhibit similar behavior which decreases stepwise, where the low temperature dielectric constant is > 40 (at 80 K) and at RT it was > 4000.…”

“…1,2 The cross coupling between electric field by magnetization or magnetic field by polarization leads to accomplish large number of magnetic, electric and magnetoelectric properties to meet the desperate urge for miniaturized and integrated devices. Among reported single-phase multiferroics, BiFeO 3 and BiMnO 3 are most prominent room temperature (RT) multiferroics. Recently, LaFeO 3 ceramics also gained considerable attention for high potential applications in thermodynamics, mechanics and sensing applications due to its multiferroic character and colossal dielectric constant (CDC).…”

“…LaFeO 3 exhibit orthorhombic distorted perovskite unit cell with Pbnm space group. It contains only trivalent iron and exhibiting a high value of the Neel temperature (T N $ 477 C) and ferroelectric transition at 830 C. 3,4 As a fact most of the transition metal ions have been proved to be one of the most prominent CDC materials. Ever since, these material suffers multiple valance (Fe 3þ /Fe 2þ , Ti 4þ /Ti 3þ , Mn 3þ /Mn 4þ ) which can be correlated with oxygen vacancies is a common feature for the CDC effect in transition metal ions.…”

Caracterização óptica e estrutural de ortoferritas de lantânio dopadas com cromo e alumínio

“…A ortoferrita de lantânio, segundo a literatura, tem sido obtida por vários métodos, como mecânico-químico [9,10], reação no estado sólido [11], tratamento hidrotérmico [12], sol-gel [13,14], coprecipitação [15,16], método complexo polimerizável [17], método de sais fundidos [18] Os pós foram preparados pelo método sol-gel proteico [20,21]. Esse método consistiu em adicionar água, gelatina e nitratos metálicos em um béquer, sob agitação a 70 °C.…”

Structure, Ferromagnetic, Dielectric and Electronic Features of the $$\hbox {LaBiFe}_{2}\hbox {O}_{6}$$ LaBiFe 2 O 6 Material

“…The LaFeO 3 is a material that has been extensively studied and belongs to this family of ceramic oxides. This crystallizes in an orthorhombic structure at room temperature and therefore is known as orthoferrite [11]. Its most interesting features are: a) its antiferromagnetic response, due to the collinear arrangement of two pseudocubic subnets, consisting of octahedral FeO 6 in a magnetic symmetry type G, but additionally evidences weak ferromagnetic response as a result of canted spin order in some cations Fe 3+ [12]; and b) its electrical polarizability, with a high dielectric constant at low frequencies, caused by oxygen vacancies and the high capacitance in parallel with a high resistance, formed by contact between grains of the polycrystalline system [13].…”