The thermal expansions along b - and c -directions can be analyzed according to the structure of YFeO 3 crystal. As we know, the distances of ionic interlayer are the same along a -axis, b -axis and c -axis for cubic pervoskite. The structure of YFeO 3 crystal is orthorhombic pervoskite, with distortions along two axes.
Yttrium orthoferrite (YFeO3) powder was prepared by a mechanochemical synthesis from a mixture of Y2O3 and α-Fe2O3 powders in a planetary ball mill for 2.5 h. The obtained YFeO3 powder sample...
The YFeO 3 NPs were characterized by micro-Raman and Fourier-transform infrared spectroscopy. Their crystalline structure and average diameter of 30 nm was …
2.1. Preparation of solid electrolyte RbAg 4 I 5. RbAg 4 I 5 was synthesized by high-energy ball milling process in Ar atmosphere. Pure powders of β-AgI and RbI were used as raw materials.Desired amounts of β-AgI and RbI (molecular ratio was 4:1) were weighed and mixed in an agate mortar.First, the mixture was ground by an agate pestle for 5 min …
Ball milling for 1.5 h induced defibrillation with an average diameter of 33 nm. The impact force, shear force, compression, and frictional force resulted in the reduction of size. After 3.0 h of ball milling, the diameter again was reduced to around 26 nm.
SiO x-based anodes have attracted tremendous attention owing to their low cost, higher theoretical capacity than graphite and lower volume expansion than pure silicon.In this work, a simple and cost-effective two-step ball-milling method was proposed to fabricate Si/SiO x /C composites by using commercial SiO and graphite carbon as raw materials. The two …
Since YFeO 3 experiences a canting angle between magnetic sub-lattices, anisotropic effects are well-defined. However, spin-flip transition effects are more difficult to identify as only magnetic Fe ions exist in each sub-lattice. Hence the magnetization of each ion in the system must be equal in magnitude. However, the ABO 3 structure of Yttrium
of yfeo ball milling. Dielectric, ferroelectric and magnetic properties of Mn, The raw powders with the stoichiometric ratio were mixed by ball milling with zirconia media in de-ionized water for 24 h The mixtures were calcined at 1373 K in air for 3 h and then ball milled for 24 h again The dried powders, with 5 wt % PVA (polyvinyl alcohol) added, …
The ball mill Ball milling is a mechanical technique widely used to grind powders into ne particles and blend materials.18 Being an environmentally-friendly, cost-effective technique, it has found wide application in industry all over the world. Since this mini-review mainly focuses on the conditions applied for the prep-
Synthesized YFeO 3 nanoparticles have strong absorption in the UV–Vis regions ( λ = 200–400 and 400–600 nm) and are soft ferromagnetic materials with high magnetization. Additionally, YFeO 3 nanoparticles with a low energy bandgap ( Eg ≈ 2.4 eV) are suitable for photocatalysis and can be recovered by magnets. Introduction
The two-step ball-milling synthesis of the Si/SiO x /C composites can avoid the generation of an inert SiC phase and realize the uniform dispersion of Si/SiO x in graphite carbon, which offers good electrical conductivity and relieves the volume expansion of …
Among transition metal nitrides, molybdenum nitrides have been much less studied even though their mechanical properties as well as their electrical and catalytic properties make them very attractive for many applications. The δ-MoN phase of hexagonal structure is a potential candidate for an ultra-incompressible and hard material and can be compared …
All results show that YFeO3 synthesized by high-energy ball milling assisted with annealing possess a multiferroic behavior. AB - © 2018 Elsevier Ltd and Techna Group S.r.l. We …
Yttrium orthoferrite of the composition YFeO3, which adopts a distorted orthorhombic perovskite-related structure (space groupPnma), is of interest due to its attractive physical and chemical properties that are associated with a variety of applications including fast latching optical switches, sensors and catalysts [1–7].
The hexagonal ferrites MFeO 3(M = Y, Yb, In) have been studied using a combination of neutron and X-ray powder diffraction, magnetic susceptibility, dielectric measurements and 57Fe Möss spectroscopy. This study confirms the previously reported crystal structure of InFeO 3(YAlO 3structure type, space group P6 3/mmc), but YFeO 3and …
WebIn summary, the high energy ball milling process is shown to be efficient in the preparation of YFeO 3 nanoparticles. The analysis of the X-ray diffraction data indicates that the …
The morphology of Fe 2 O 3 powders was controllable during ball milling, so it was used as an additive for mechanical alloying [57, 58]. Similarly, in the liquid metal forming process, oxides with thermal stability or melting points lower than Y 2 O 3 can be added into the liquid steel containing Y as oxygen carriers.
During the high-energy ball milling process, the powder particles are subjected to high energetic impact. Microstructurally, the mechanical alloying process can be divided into four stages: (a) initial stage, (b) …
As they explained, two effects coexisted in the milling process. On one hand, large particles were crushed and divided into small pieces. On the other hand, small particles tended to join together to form large agglomerates. After 8 h of milling, a dynamic equilibrium might be achieved between the two effects.
In this work, we report the effects of calcination temperature on structural, dielectric, semiconducting and optical properties of YFeO3 nanoparticles prepared by a …
On the other hand, ball-milling process provides an original strategy to modify materials at the nanometer scale. This methodology represents a smart solution for the fabrication of MoS2 ...
A kind of preparation method of ferrous acid yttrium ceramics of the present invention, weighs YFeO 3 Powder, oxidation bait and deionized water, the YFeO 3 The mass ratio of powder, oxidation bait and deionized water is 100:0.5~2:100 ~ 210, by YFeO 3 Powder, oxidation bait and deionized water are put into ball milling mixing in ball …
used to prepare the material conventionally. The bulk and surface crystal structure of the nanoparticles is studied with X-ray diffraction, Möss spectroscopy, Atomic Force …
The YFe 1-x Mn x O 3 series ( x = 0, 0.05, 0.1, 0.15, and 0.2) orthorhombic nanomaterials were prepared by the citric acid sol–gel method and annealing of the precursor at 800 °C for 2 h [ 11 ], showing the domination of YFeO 3 hexagonal structure when the calcination temperature (T°) < 800 °C or x > 0.2.
In this work, we report the effects of calcination temperature on structural, dielectric, semiconducting and optical properties of YFeO 3 nanoparticles prepared by a …
Y 3 Fe 5 O 12 (YIG) was successfully obtained by high energy ball milling (5 h) and subsequent annealing at 900 °C for 3 h. Results of ball milling set out the …
Ball milling is a simple, fast, cost-effective green technology with enormous potential. One of the most interesting applications of this technology in the field of cellulose is the preparation and the chemical modification of …
The typical microstructures of oxide dispersion strengthened (ODS) steel include: sub-micron grain size, defect sink strengths near or greater than 10 16 m −2, nano-oxides with average diameters ≈ 1–5 nm, number density N ≈ 10 23−24 m −3 and volume fraction f ≈ 0.5%–1%, coherent and semi-coherent interface relationships, and misfit …
The structural properties of the pristine and milled powders, which have different particle sizes were examined with X-ray diffraction, soft X-ray absorption spectroscopy, and transmission electron microscopy …
The size of the ball mainly depends on the particle size of the material to be ground, and the diameter and speed of the mill can be considered appropriately. Formula (1-15) is an empirical formula for spherical diameter and feed size. dmax — The maximum diameter of steel ball, mm; amax — the maximum size of feeding granularity, mm.
We report a dielectric study in wide frequency and temperature ranges of yttrium orthoferrite, YFeO 3, in order to obtain the temperature-frequency dependence of the dielectric relaxation processes.A mixture of oxide powders (Y 2 O 3 and Fe 2 O 3) was activated by high-energy ball milling.The mechanically activated powders were pressed and ...
Layered LiNi 0.4 Mn 0.4 Co 0.18 Ti 0.02 O 2 cathode powders were ball-milled for various lengths of time. The structural properties of the pristine and milled powders, which have different particle sizes were examined with X-ray diffraction, soft X-ray absorption spectroscopy, and transmission electron microscopy to determine the effect …
A variety of chemical methods have been reported for the synthesis of semiconducting materials including perovskites, spinels, or illminites which include ball-milling [ 6, 7 ], combustion synthesis [ 8 – 10 ], co-precipitation [ 11 ], sol–gel [ 12 – 15 ], radio frequency sputtering [ 16 – 19 ], solid-state reaction [ 20 – 22 ], and molten-salt …