Photoexcited-carrier transport properties at the surface and the interface of barium strontium titanate/strontium titanate heterostructures are reported. Under a 365 nm light irradiation, the surfaces of barium strontium titanate films exhibit a metal-to-insulator transition, while the interfaces favor the metallic conduction with increasing ...
Magnetic measurement shows that the barium strontium hexaferrite sample sintered at 1,150 °C has the coercive field of 1,998 Gauss, remnant …
Barium and strontium sulfates are highly resistant to the acids that are generally used as scale dissolvers. In this work, a new chelating-agent-based alkaline barium- and strontium-sulfate scale dissolver named SA-209 has been developed. Many of its important parameters such as salt concentration, reaction time, pH value, …
Crystalline magnesium, strontium, and barium L-glutamate complexes containing the dianion L-Glu 2− have been prepared as the tetrahydrate (Mg) and hexahydrates (Sr, Ba), respectively. Their aqueous solutions have pH values of 10.45, 11.05, and 10.93, respectively. The solid state structures of the Mg and Sr complexes have been …
The present paper deals with the study of microwave absorption properties of cobalt- and indium-doped M-type barium–strontium (Ba0.5Sr0.5CoxInxFe12−2xO19) hexagonal ferrites. The standard ceramic method is used to synthesize Ba0.5Sr0.5CoxInxFe12−2xO19 hexagonal ferrite of varying compositions (x = 0.0, 0.2, …
Polysiloxanes polymer coatings were formed on carbon fiber-reinforced silicon carbide (C/SiC) composites at 100°C in air with barium–strontium aluminosilicate (BSAS) as fillers. After the polymeric coatings were pyrolyzed at 1350°C under argon, a dense SiOC–BSAS-coated C/SiC composite was obtained.
The saturation magnetization reached the optimum value of Ms=∼67 emu/g with coercivity of 2596 Oe, under sintering temperature up to 1100°C for 4.5 h. ... Barium hexaferrite and strontium ...
An intrinsically switchable and frequency reconfigurable bulk acoustic wave filter bank based on ferroelectric barium strontium titanate (BST) is presented. Ferroelectric BST possesses electric-field-induced piezoelectricity, enabling the design of voltage-controlled acoustic devices, including thin-film bulk acoustic resonators and …
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Higher remanent magnetic induction of barium ferrite was reflected in higher remanent magnetization of the equivalent composites. ... Ni/Mn doped Barium Strontium Ferrite nanoparticles (Ba0.25Sr0 ...
Spontaneous magnetization and magnetic domain texture of strontium hexaferrite same polarity but different chirality can be called "double- vortex", "two-vortex" or "vortex pair" [ 26 ...
Request PDF | Raman and magnetization studies of barium ferrite powder prepared by water-in-oil microemulsion | Micro-Raman spectroscopy was used to study the formation of BaFe12O19 (BaM) powders ...
Estimation of iron ion distribution at various sites contributing to saturation magnetization in barium hexaferrite at different sintering temperatures ... This work shows that the magnetic properties of M-type hexagonal strontium ferrite could be significantly improved by optimizing the pre-sintering temperature, which helps the …
A superlattice of the composition Ba 0.8 Sr 0.2 TiO 3 /Ba 0.4 Sr 0.6 TiO 3 has been grown by rf cathode sputtering on a MgO(001) substrate. The unit cell parameters of the superlattice layers along the normal to the substrate, modulation period, and orientation relationships between the film and the substrate have been determined using X-ray …
Mentioning: 4 - Summary Scale inhibitors have been widely used as one of the most efficient methods for sulfate-scale control. To accurately predict the required minimum inhibitor concentration (MIC), we have previously developed several crystallization and inhibition models for pure sulfate scales, including barite, celestite, and gypsum. …
According to the data in Fig. 3, the total out-of-plane polarization P 3 in BST graded films as a function of concentration gradient x is computed and exhibited in Fig. 4.Since only c phase and paraelectric phase could exist in all layers, P 3 is always above zero, meaning that the graded films may obtain ferroelectric properties. This …
In this study, the powders of the Ba0.75Sr0.25TiO3 (BST) nanoparticles were directly synthesized by milling of Ba(OH)2·8H2O, Sr(OH)2·8H2O, and Ti(BuO)4 in ethanol at room temperature. They have homogenous grains of ~ 15 nm and high sintering activity. The dense ceramics with the density > 90% can be obtained at a sintering temperature …
In Equation, χ i j is the dielectric susceptibility and γ k l is a constant material tensor, while the symbols e and a represent the electron charge and atomic dimension of the unit cell. Thus, ferroelectric materials are expected to display much larger flexoelectric coefficients and stress induced polarization. Our group has previously demonstrated …
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This paper describes the investigation of Ba 0.6 Sr 0.4 TiO 3 bulk ceramics with different porosity and grain sizes, as well as of Ba 0.6 Sr 0.4 TiO 3 thick films with …
Rejection of heavy metal ions (i.e., barium and strontium) in crossflow experiments at different feed pH, concentration and pressure was investigated and Spiegler–Kedem model was fitted for a fully aromatic polyamide (1,3–benzenediamine (m–phenylenediamine) with trimesoyl chloride, i.e., MPD – TMC chemistry) [42], [43] NF …
We assessed the spatial distribution of 35 elements in aquifer sediments and groundwater of a crude-oil-contaminated aquifer and show evidence of the dissolution of barium (Ba), strontium (Sr), cobalt (Co), and nickel (Ni) during hydrocarbon oxidation coupled to historic microbial Fe(III)-reduction near the oil. Trace element plumes occur in the crude-oil …
Spontaneous magnetization and magnetic domain texture of strontium hexaferrite in equilibrium state ... also found that the anisotropy could be changed by doping rare-earth Sc into M-type barium hexaferrite. The competition between magnetic dipole interaction and magnetic anisotropy will produce noncollinear or noncoplanar magnetic moment ...
M-type Hexaferrites B0.5Sr0.5Fe12−2x Ni x Zr x O19 were synthesized and investigated. The XRD patterns show single phase of the magnetoplumbite barium …
Barium strontium titanate (Ba x Sr 1−x TiO 3) films were deposited by sol–gel technique on platinized silicon substrate for the composition range x = 0.0 to 1.0 in steps of 0.1. The as-deposited films were found to be amorphous. The films crystallize on annealing in air at 700 °C for 1 h. Dielectric constant ( ε ′) and loss tangent (tan ...
Here, the water vapor reaction mechanism for barium strontium alumino-silicate (BSAS), an early generation EBC candidate, was determined from the time and temperature dependences of material loss. BSAS water vapor exposures were performed at 1200 °C, 1300 °C, and 1400 °C for 24, 48, and 72 h, at maximum gas velocities of ~ 240 …
Solvay has reached an agreement with Latour Capital to sell its technical-grade barium and strontium business in Germany, Spain and Mexico as well as its sodium percarbonate business in Germany. Solvay's barium and strontium business includes a joint venture with Chemical Products Corporation (CPC), which is part of the transaction.
M-type Hexaferrites B0.5Sr0.5Fe12−2x Ni x Zr x O19 were synthesized and investigated. The XRD patterns show single phase of the magnetoplumbite barium strontium ferrite and no other phases were present. The samples exhibit well defined crystallization; all of them are hexagonal platelet grains. As the substitution level …
The sintered MnZn ferrites have a density of 4.81 ± 0.01 g/cm 3 and is hardly affected by the BST content. In the meantime, the saturation magnetic induction (B s) …
The advent of horizontal hydraulic fracturing and its implementation for unconventional shale gas development in the Marcellus Shale region in the northeastern United States have created a uniquely challenging wastewater stream, termed produced (or flowback) water. The salinity or the total dissolved solids (TDS) of this wastewater …
Magnetocaloric Effects of Barium-Strontium Ferrites for Magnetic Refrigeration System. Hasan Khaled Rouf. 2018, Advanced Materials & Technologies. See Full PDF Download PDF.
A complete tunability electromagnetic simulation model for the Ba 0.6 Sr 0.4 TiO 3 (BST), with ɛ r ≈ 2000, and Mg 2 B 2 O 6 (MBO), with ɛ r ≈ 7, composites is …
Strontium ferrite saturation magnetization strength of about 1.35 T, higher than barium ferrite about 1.1 T. This is because the strontium atomic radius is larger, so that the ferrous ion spacing increases, reducing the antimagnetic exchange of ferrous ions, which is conducive to improving the saturation magnetization strength. 2.
