Synthesis and magnetic properties of PrFeO3 nanopowders by the co-precipitation method using ethanol

Abstract

Praseodymium orthoferrite nanoparticles were synthesized by a simple co-precipitation method via the hydrolysis of Pr (III) and Fe (III) cations in boiling ethanol with 5% aqueous ammonia. The single-phase PrFeO 3 product formed after annealing the precipitates at 650, 750, and 850 • C for 1 h had an average crystal size of 20-30 nm (XRD, SEM, TEM). The synthesized nanopowders were soft ferromagnetic materials with low coercive force and excessive magnetization values.

Sol-gel synthesis and the investigation of the properties of nanocrystalline holmium orthoferrite

“…Based on these calculations, we can conclude that the crystallite size does not exceed 30 nm for HoFeO 3 . The calculation of the unit cell parameters from the diffractometry data showed that an increase in the annealing temperature led to a slight increase in the unit cell volume (Table 1), which was also observed in studies [36,37]. As shown in the study [36], a reliable estimate of the crystallite size from the broadening of diffraction peaks is possible only in combination with additional structural data, for example, with the results of electron microscopy.…”

Personalized energy systems based on nanostructured materials

“…Current works in the field of development of nanostructured converters and storage devices are mainly focused on the problems of physical and chemical formation of structural and functional characteristics and the development of methods for technological support of the synthesis of nanodisperse and nanoporous materials [222][223][224][225][226][227][228][229][230][231][232][233][234]. Also their technological applications in different types of converters, in particular, thermoelectric, solar and wind generators, fuel cells, batteries and galvanic batteries, supercapacitors and other devices, up to systems of high-temperature superconductivity are being discussed [235][236][237][238][239][240][241][242][243][244][245][246][247][248].…”

“…The geometric associativity of P and RS blocks fragments can be estimated by the comparing of these blocks areas sizes or unit cell parameters, in particular, by the size ap, as shown in the scheme. 295], as well as to the sol-gel and hydrothermal technology with nanopowder deposition from the initial mixture and subsequent dehydration during heat treatment [195,196,198,200,229,231,[296][297][298]. It is used to produce layered calcium cobaltite Ca 3 Co 4 O 9 during the combustion of a glycine-nitrate gel precursor [299][300][301][302].…”

“…This method provides a higher dispersion and uniformity for the synthesized powders, including stoichiometric composition, which helps to solve the problem of their sinterability, and brings the properties of materials based on them closer to the properties of single-crystal samples. Examples of the structures of highly dispersed Ca Recently, the solution combustion (SCS) method has been used to obtain new nanostructured multiferroic materials with unique magnetic, electrical, and catalytic properties based on rare-earth element (REE) orthoferrites RFeO 3 (R = Y, Ln) [194,207,231,297,[303][304][305][306][307][308][309][310] with a perovskite-like structure, combining ferromagnetic and ferroelectric ordering. In some cases, it has been shown that the use of additional heat treatment of solution combustion products and other chemical precursors leads to the formation of metastable forms of REE orthoferrites and a significant change in the functional characteristics of materials based on them [231,311,312].…”

“…Examples of the structures of highly dispersed Ca Recently, the solution combustion (SCS) method has been used to obtain new nanostructured multiferroic materials with unique magnetic, electrical, and catalytic properties based on rare-earth element (REE) orthoferrites RFeO 3 (R = Y, Ln) [194,207,231,297,[303][304][305][306][307][308][309][310] with a perovskite-like structure, combining ferromagnetic and ferroelectric ordering. In some cases, it has been shown that the use of additional heat treatment of solution combustion products and other chemical precursors leads to the formation of metastable forms of REE orthoferrites and a significant change in the functional characteristics of materials based on them [231,311,312]. It has been shown that in this case, the chemical and structural background of the precursor exposed to thermal action plays an important role [313][314][315][316], while for other systems, for example, KNO 3 -BaTiO 3 -based ferroelectrics, the necessary properties can be achieved by simple mechanical mixing of the components and the background does not play a significant role [317].…”