Materials Literature
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In this paper a procedure for the identification of the parameters of the Jiles–Atherton (JA) model is presented. The parameters of the JA model of a material are found by using a neural network trained by a collection of hysteresis curves, whose parameters are known. After a presentation of the Jiles–Atherton model,…
Patterned SmCo thin films were electroplated from an aqueous solute containing glycine by using dc and pulse dc current on the beaker level. Micromolds prepared by photolithography allow an accurate pattern transfer for patterned deposition of the material. A flux guide of a magnetic microactuator was chosen as a patt…
La0.5Ba0.5CoO2.87 has been characterized with neutron and synchrotron powder diffraction and magnetization measurements. This compound was shown to have a cubic crystal structure at temperatures above 200 K whereas slightly above the Curie point T c ∼ 170 K the structural separation into two different pseudocubic phas…
This paper presents the fabrication and characterization of parylene-bonded isotropic Nd–Fe–B powder micromagnets with dimensions in the range of 100–1000 μm. The batch fabrication process involves dry-pressing of magnetic powders into microstructured cavities in a substrate followed by conformal vapor deposition of p…
Single crystals of Eu 5 (BO 3 ) 3 Cl were obtained by serendipity by reacting Eu 2 O 3 and Mg with B 2 O 3 at 1300 K in the presence of an NaCl melt for 13 h in silica-jacketed Nb ampoules. Ba 5 (BO 3 ) 3 X (X = Cl, Br) crystals were formed by direct synthesis from appropriate amounts of Ba(OH) 2 , H 3 BO 3 and the re…
This review deals with recent progress on the development of composite materials based on cojugated polymers (CPs) and carbon nanotubes (CNTs), both from fundamental and applied point of view. In the first part of the manuscript, we present the different types of composites, the new protocols used in their synthesis a…
The tensile and compressive strength of raffia palm fiber-cement composites for low cost roofing tiles was investigated. The composites were prepared at varying sand-to-cement ratios (1-5), water-to-cement ratios (0.4-0.8) and fiber volume fraction (0-4%). The tensile and compressive strengths of the samples were dete…
Metallographic analysis can be used to determine the microstructure of platinum alloys in order to set up working cycles and to perform failure analyses. A range of platinum alloys used in jewellery and industrial applications was studied, including several commonly used jewellery alloys. Electrochemical etching was u…
Electronic structures and optical properties of hexagonal boron nitride (h-BN) under hydrostatic pressure are studied using density functional theory calculations. Charge density difference, density of states, band structures, and dielectric functions are calculated to reveal the evolution of the electronic structures…
Horseradish peroxidase (HRP) is proved being effective in eliminating oil from aqueous solutions, but the elimination is expensive because free HRP can not be reused. In present work, HRP was successfully immobilized on cordierite porous ceramics support with a novel method of N-beta-aminoethyl-gamma-aminopropyl-trime…
Abstract The solvothermal reaction of manganese(II) acetylacetonate [Mn(acac) 2 ], 1,1,1‐tris(hydroxymethyl)ethane (H 3 thme), 1,1,1‐tris(hydroxymethyl)propane (H 3 thmp), and (CH 3 ) 3 CCO 2 H leads to a series of mixed‐valence Mn III 4 Mn II 8 clusters, [Mn III 4 Mn II 8 (μ 5 ‐O) 2 (μ 3 ‐OMe) 2 (thme) 4 (Me 3 CCO 2…
The first-order character of the transition from the low-to-intermediate spin state in the system (Pr1−yYy)0.7Ca0.3CoO3 (y = 0.075–0.15) has been verified by magnetization measurements. For y = 0.075, the transition manifests itself in χ(T) steps at temperatures depending on external fields. In this case, isothermal m…
Hydrotalcite-like compound (HTlc) with a Mg/Al molar ratio of 2:1 was synthesized by using a coprecipitation method and the sorption removal of Cu(II) by the Mg-Al HTlc sample from CuSO4 solution was investigated. It was found that the Mg-Al HTlc showed a good sorption ability for Cu(II) from CuSO4 solution, indicatin…
Abstract Double perovskites with the structural formula A 2 BB′O 6±δ , especially the strontium ferromolybdate Sr 2 FeMoO 6–δ , have attracted a lot of attention due to their unique magnetic and electrical properties and a possible application in spintronic devices. However, a strict correlation between the functional…
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Rakovanite, Na 3 {H 3 [V 10 O 28 ]}·15H 2 O, is a new mineral species from the Sunday and the West Sunday mines, Slick Rock district, San Miguel County, Colorado, USA; the mineral is the natural analog of the previously synthesized phase. Rakovanite is orange, with an orange-yellow streak. Crystals of rakovanite are u…
A radio frequency argon plasma reactor with a stirrer was employed for the surface treatment of polypropylene (PP) powders. The changes in the superficial contact angle and the superficial composition of the un-treated and treated PP powders were analyzed by means of water contact angle (WCA) measurement, X-ray photoe…
A procedure for optimizing a field-emission cathode based on carbon nanotubes (CNTs) is developed. An array of identical equidistant vertical CNTs is considered. The optimization procedure takes into account the effect of screening of an electric field by neighboring nanotubes by solving a Laplace equation and the the…
A large experimental campaign has been developed in order to study the passivity of steel embedded in mortar. Mortar samples, containing steel pill (initially polished or precorroded), have been placed in various conditions [relative humidities of 80, 90 and 95%; solution simulating the clay rock underground water of…
Nondoped ZnO film on a polyethylene terephthalate film was successfully grown by conventional spray pyrolysis at 100 °C using a diethylzinc-based solution under air atmosphere. The samples had an average optical transmittance of more than 80%, a flat surface, and an a -axis orientation from the optical transmittance,…