Materials Literature
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A phase transition is the transformation of a thermodynamic system from one phase to another. The distinguishing characteristic of a phase transition is an abrupt sudden change in one or more physical properties. Typically the phase transition is driven by a change in the temperature of the system. However, change of…
Fréedericksz transitions between stationary planar deformation states, induced by cover surface interactions and by static external electric or magnetic field in a flat-parallel nematic liquid crystal cell, are studied theoretically in one-dimensional approximation. There is demonstrated that for initial stages of tra…
The complex cobalt and nickel oxide Sr2.25Y0.75Co1.25Ni0.75O6.84 has been synthesized by the citrate method. The oxygen content of the oxide has been determined by iodometric titration. The crystal structure of the compound has been refined using X-ray powder diffraction data (a = 3.7951(2) Å, c = 19.700(1) Å, χ2 = 1.…
A major limitation in fabricating a monolithic Bi2Te3-based thermoelectric thin film device is patterning poorly adhesive Bi2Te3and Bi0.5Sb1.5Te3thin films. In this paper, we present a simple wet etching process that can prevent the delamination of thermoelectric thin films. This process is compatible with standard IC…
SrRuO3-delta(SRO) films were deposited on SrTiO3substrates by an RF magnetron sputtering method and post-annealed in various conditions, and the relationship between their oxygen content, crystallinity, and the magnetic properties was studied. Oxygen content of SRO thin films was evaluated by a non-Rutherford elastic…
Using three kinds of graphites with different graphitization degrees as carbon source and Fe–Ni alloy powder as catalyst, the synthesis of diamond crystals is performed in a cubic anvil high-pressure and high-temperature apparatus (SPD-6 × 1200). Diamond crystals with perfect hexoctahedron shape are successfully synth…
The effect of the isocyanate index, which is the molar ratio NCO:OH, on the development of structural mechanical and fatigue characteristics of microcellular polyurethanes has been studied. The correlation between fatigue and mechanical characteristics of microcellular polyurethanes at an elevated temperature (100°C)…
We report tribological properties of diamond-like carbon (DLC) film of which surface has been nanostructured with femtosecond (fs) laser pulses. For this study, the fs-laser processing technology has been developed to produce a uniformly nanostructured DLC surface over a wide area of 15 x 15 mm 2 . The results have de…
Ultrafine substituted M-type barium ferrite BaTiCoFe10O19 powders were synthesised successfully by the sol-gel method. The hydroxide precursor particles were formed in a gel solution containing ethanol and water at a ratio of 1 : 1 and using NaOH as a co-precipitation agent. The effects of preheat treatments on format…
This paper deals with the static and dynamic characterisation of novel piezo resistive diamond like carbon layers which can be fabricated with high hardness and wear resistance. The advantage of these films, deposited in a plasma enhanced chemical vapor deposition process (PECVD), is the possibility to integrate them…
The realization of a body-area network demands innovative solutions to efficiently power the wireless sensor nodes that typically consume about 100µW of power. Thermoelectric generators (TEGs) harvesting energy from wasted human body heat provide an attractive solution, potentially producing about 30µW per square cent…
We have investigated the history-dependent adsorption behavior of the diblock copolymer P2VP−PEO. The solution self-assembly of this polymer is pH-tunable such that micelles with a P2VP core and a PEO corona are formed above the polymer's p K a of 5.9. In-situ attenuated total reflection and atomic force microscopy we…
Two MHPOBC analogues, exhibiting ferroelectric and antiferroelectric phases, have been studied by means of frequency domain dielectric spectroscopy, time domain spectroscopy and electrooptic methods. Four relaxation processes at low frequencies and one broad spectrum at high frequencies have been revealed in the antif…
As well known, an inrush current of transformer reaches about several times larger than the rated current. When such a large inrush current flows into a superconducting transformer, it will induce a quench of superconducting windings. In this paper, we fabricated a small experimental superconducting transformer, and i…
Commercially available integrated compact fluorescent lamps (CFLs) use self-resonant electronic ballasts on grounds of cost. To improve ballast efficiency, it is necessary to quantify the losses. The losses occurring in these ballasts have been directly measured using a precision mini-calorimeter. In addition, a PSPIC…
During the last decade, Very Low Frequency (VLF) testing for extruded distribution cables has gained interest among the North American utilities. The increasing interest is evidenced by recent research publications and discussions inside the expert community in which standards are being proposed and continuously discu…
Decreasing the length of thermoelectric (TE) module legs results in a significant increase in power density, both for cooling applications and electricity generation. However, this reduction also results in a significant increase of mechanical stress in the legs materials. Thus, it is important to implement an effecti…
The electric and thermogravimetric properties of oxygen-deficient perovskite-like complex oxides Ba 2 HoGaO 5 , Ba 2 YGaO 5 , Ba 2 ScInO 5 , and Ba 2 Sc 2 O 5 are studied. It is found that these phases are capable of intercalating water from a gas phase; however, the total water amount is smaller than the supposed nom…
Robust room temperature ferromagnetism is obtained in single phase Gallium Phosphide doped with Cu2+prepared by simple solid state reaction route. The saturation magnetization at 300 K is 1.5times10-2emu/g and the coercivity was found to be 125 Oe. A strong ferromagnetic resonance signal confirms the long range magnet…
The effects of (NH4)2Sx treatment on the surface electronic properties of the thin indium tin oxide (ITO)-doped ZnO films have been examined in this study. According to the experimental results, we found that the formation of S-metal bonds and the removal of oxygen vacancies near the (NH4)2Sx-treated ITO-doped ZnO sur…