Materials Literature
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Lead magnesium niobate titanate is an important ferroelectric material. In this study, the terahertz ( TH z) transmission properties of a 0.73 Pb ( Mg 1/3 Nb 2/3 ) O 3 –0.27 PbTiO 3 single crystal were investigated using a time‐domain spectroscopy method. Complex refractive index and dielectric dispersion functions we…
A simple interferometric technique for measurement of the internal field (IF) in a ferroelectric crystal has been proposed. This technique has several advantages over the other methods used previously for evaluation of IFs in ferroelectric crystals. Here, the electro-optic property of lithium niobate is exploited for…
A three dimensional nano-SQUID (Superconducting Quantum Interference Device) has been realized in a vertical configuration (with the loop in the same plane of Josephson Tunneling Junctions, JTJs). The loop area is 0.25 μm 2 corresponding to a modulation period of about 5 mT, the square JTJs have a side length of 0.3 μ…
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The pinning mechanism of MOCVD-grown YBCO coated conductors with Y 2 O 3 precipitates was investigated by angle-resolved transport measurement of J c in a wide range of temperature and magnetic fields. Aside from the Y 2 O 3 nanoprecipitates, a -axis grains and threading dislocation along the c-axis were found in the…
High crystalline layers of InN were grown on MgO(100) substrates by gas source molecular beam epitaxy. Good quality films were obtained by means of an in-plane rotation process induced by the annealing of an InN buffer layer to minimize the misfit between InN and MgO. In situ reflection high-energy electron diffractio…
We present results demonstrating directed self-assembly of nanometer-scale mounds during molecular beam epitaxial growth on patterned GaAs (001) surfaces. The mound arrangement is tunable via the growth temperature, with an inverse spacing or spatial frequency which can exceed that of the features of the template. We…
We study the optimal temperature to obtain YBa 2 Cu 3 O 7-δ epitaxial films grown onto SrTiO 3 substrates by direct solution deposition. The samples received heat treatment at 820, 840 and 860 °C, then characterized by XRD, observing the (00l) profiles; and magnetic susceptibility measurements. The T C-onset for all t…
In the paper optical properties of 40TeO2 – 20GeO2 – 30(PbO – PbF2)– 10(BaO – Nb2O5 – LaF3) glass system co-doped with Er3+/Tm3+ ions were investigated. The maximum of phonon energy at 790cm-1 in fabricated tellurite glass which was determined by FTIR measurements. Optimisation of glass composition led to the emission…
Solar panels are expected to play a major role as a source of sustainable energy. In order to evaluate solar panels, non-destructive tests, such as defect inspections and response property evaluations, are necessary. We developed a DC current distribution mapping system of the solar panels using a High Critical Temper…
In order to understand the all-chemical-solution-deposition (CSD) processes for manufacturing coated conductors, we investigated the phase evolution of YBa2Cu3O7 (YBCO) films deposited by a low-fluorine metal-organic solution deposition (LF-MOD) method on CSD derived Ce0.9La0.1O2/Gd2Zr2O7/NiW. It is shown that the pha…
We report on successful fabrication of superconducting FeSe wire using hot gas extrusion (HGE) ex-situ PIT (powder in tube) method. Length of the obtained wire was about 60cm with cross-sectional superconducting core area nearly 2.5 × 10 −3 cm 2 . For the wire sample we observed superconducting transition temperature,…
The effect of BaZrO 3 (BZO) dopant concentration (0-9 wt-%) on magnetically obtained irreversibility field B irr and upper critical field B c 2 is investigated in YBa 2 Cu 3 O 6+ x (YBCO) thin films prepared by pulsed laser deposition on SrTiO 3 (001) (STO) substrates. It is found that the magnetic determination of B…
Abstract Corrosion is causing partial or total destruction of the material in general, and of metals in special due to a reaction with the environment. This destruction is in fact a natural process because of the metals in processed form, have a high energetic level and there is a normal tendency to revert back at ini…
Abstract While downhole chemical squeeze treatments are common practice for deploying scale inhibitors to protect wellbores and downhole production tubulars from inorganic deposits, their adoption for corrosion inhibitor treatments (CISQ) is much less commonplace. Historically they have often not been considered an op…
In the article the upconversion luminescence ofTeO2– GeO2 – PbO – PbF2– BaO – Nb2O5 – LaF3 glass system co-doped withYb 3+ /Tb 3+ under 976 nm laser diode excitation was investigated. The influence of Tb2O3concentration on the luminescent properties was determined. Measured strong luminescence at492, 547, 588, 622 nm…
In the present study, shear response of the Al (001) symmetrical tilting � 5 (310) grain boundary (GB) was investigated by a three dimensional bicrystal at 500∼750 K. It was found that the GB gradually rotated around the (001) tilt axis during the shear deformation due to the combination of surface strain, GB sliding…
The effect of BaCeO 3 (BCO) dopant concentration on magnetically obtained irreversibility field B irr and upper critical field B c 2 is investigated in YBa 2 Cu 3 O 6+x (YBCO) thin films prepared by pulsed laser deposition on SrTiO 3 (001) substrates. The unchanged values of B irr and B c 2 are connected to the struct…
An approach to the problem of shear localization is proposed. It is based on energy minimization principles associated with micro-structure developments. Shear bands are treated as laminates of first order. The micro-shear band is assumed to have a zero thickness, leading to an unbounded strain field and the special f…
The selected InGaAsN/GaAs T-shaped quantum wire (T-QWR) fabricated by metal organic vapor phase epitaxy has been investigated by microphotoluminescence (µ-PL) and excitation-power-dependent µ-PL. The optical characteristics of one-dimensional structure were taken at low-temperature (4 K) and room temperature (RT) to c…