Materials Literature
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The properties of Pr0.7Ca0.3MnO3 resistance random access memory devices have been studied in terms of electrical pulse width, pulse polarity, film thickness, resistivity distribution, temperature dependence, device impedance, and dynamics property. Based on the experimental data it is concluded that the resistance in…
Ba 0.6 Sr 0.4 Ti O 3 (BST) thin films were prepared on MgO buffered Pt(111)∕Ti∕SiO2∕Si substrates by pulsed laser deposition. The crystallographic structure, interface characteristics, and dielectric properties of BST thin films are strongly dependent on MgO thickness. BST thin films exhibit (111) preferred orientatio…
Mg x Zn 1 − x O (x=0.0–0.20) ternary alloy thin films have been deposited by sol-gel technique and the composition related structural, microstructural, electrical, and optical properties are investigated. All the films have the hexagonal wurtzite structure. In the composition range of 0.05<x⩽0.20, a deviation f…
Using a tolerance factor approach, it was predicted that xBiScO3–(1−x)BaTiO3 will have a morphotropic phase boundary that should enhance both the polarizability and permittivity, relative to the BiScO3 end member, near a composition of x=0.4. To verify this prediction, pulsed laser deposition was used to grow xBiScO3–…
Spin polarizations (P) of polycrystalline Co2MnGe and Co2MnSi films that were sputter deposited on thermally oxidized Si substrates at various substrate temperatures (Ts) were measured by the point contact Andreev reflection technique. While continuous films were grown at Ts=500°C with the L21 structure, Mn-deficit is…
Hohle Kapseln leicht gemacht: Polymerkapseln mit einem Durchmesser von etwa 100 nm wurden in Abwesenheit von präorganisierten Strukturen oder Templaten direkt synthetisiert. Die Methode scheint auf jedes Monomer mit einem flachen Kern und mehreren polymerisierbaren Gruppen an der Peripherie anwendbar zu sein (siehe Bi…
Microbiological processes were used for chitin and chitosan productions by Cunninghamella elegans (UCP 542) grown in a new economic culture medium. The assay was carried out to evaluate the growth of C. elegans using yam bean (Pachyrhizus erosus L. Urban) medium, in different times of growth (24, 48, 72 and 96 hrs), i…
Purpose The research work in this paper aims to focus on understanding the corrosion inhibition of 6061‐8 (vol.%) SiC in 3.5 per cent NaCl solution using different concentrations (250, 500, 750 and 1,000 ppm) of cerium and lanthanum chloride. Design/methodology/approach The corrosion inhibition of 6061‐SiC in 3.5 per…
Phosphors of SrnMgSi2O5+n(1⩽n⩽2) singly doped with Eu2+ or doubly doped with Eu2+ and Nd3+ were prepared by using a solid state chemical reaction method. X-ray diffraction spectra revealed that the SrnMgSi2O5+n(1⩽n⩽2) compounds have the same crystal structure as Sr2MgSi2O7. The samples showed a strong blue emission at…
Purpose The target of the current work is the creation of a model for the prediction of the air permeability of the woven fabrics and the water content of the fabrics after the vacuum drying. Design/methodology/approach There have been produced 30 different woven fabrics under certain weft and warp densities. The valu…
The present work studies the incorporation of hydrogen in chemical vapor deposited polycrystalline diamond films with different grain sizes. Scanning electron microscopy and secondary ion mass spectroscopy were applied to investigate the film microstructure and hydrogen retention in the films, respectively. The presen…
This paper presents a constitutive model for shape-memory alloys that builds on ideas generated from recent micromechanical studies of the underlying microstructure. The presentation here is in one dimension. It is applicable in a wide temperature range that covers both the shape-memory effect and superelasticity, is…
The study investigated on medium optimization for production of exopolymer by a newly isolated bacterium, Halobacterium sp. SM5, using the mixture design and response surface method. The mixture experiment was designed by setting five parameters at the lowest and highest of concentrations: pseudo components design con…
The size dependence of the piezoelectricity in ZnO nanofilms is investigated using ab initio density-functional theory calculations. The effective piezoelectric constant of ZnO nanofilms increases monotonically with increasing film thickness in the nanoscale simulated in the present work, and surprisingly, exceeds tha…
Pseudobinary RCo7−xMx intermetallic compounds with TbCu7-type structure have been synthesized, and their structural and magnetic properties have been investigated using powder x-ray diffraction and magnetic measurements. Based upon the structural analysis, the stabilized element M occupies the 2e or the 3g position de…
In this work, we present the results obtained in fabrication and characterization of single-crystalline lead titanate nanowires synthesized by surfactant-free hydrothermal method at 200°C. The as-prepared samples were characterized by means of x-ray diffraction, field emission scanning electron microscopy, transmissio…
Aufgefädelt: Die Poren eines mesoporösen Siliciumoxidpartikels wurden mit Gastmolekülen gefüllt und anschließend durch das Auffädeln von Cyclodextrinmolekülen (CDs) bei pH 11 auf an der Oberfläche fixierte Polyethylenimin(PEI)-Ketten blockiert. Bei pH 5.5 wurden die Gastmoleküle aus den Partikelporen durch reversibles…
Low-temperature growth of self-organized ZnO nanorods on Si substrate is achieved using anodic aluminum oxide and atomic layer deposition at 250°C without catalyst or seed layer. Photoluminescence spectrum indicates that the ZnO nanorod arrays exhibit a blue∕green luminescence at 480nm. In addition, the nanorod arrays…
The temperature–stress dependence of thermoelastic martensitic transformations in shape memory alloys is a critical design tool for applications of these alloys in smart structures. This dependence has been most fundamentally expressed in a Clausius–Clapeyron linear relationship. This paper presents a theoretical anal…
The mesoscopic scale response of low-density pressings of granular sugar (sucrose) to shock loading has been examined in gas-gun impact experiments using both VISAR and a line-imaging, optically recording velocity interferometer system in combination with large-volume-element, high-resolution, three-dimensional numeri…