Materials Literature
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Abstract Silberfarbene, spröde Einkristalle von Cs 1,34 Rb 0,66 RbAu 7 und Cs 1,60 Rb 0,40 RbAu 7 wurden durch Umsetzungen von CsN 3 , RbN 3 und Goldschwamm bei 903 K erhalten. Die Strukturen wurden aus Röntgen‐Einkristall‐Diffraktometerdaten bestimmt: Cs 1,34 Rb 0,66 RbAu 7 , Raumgruppe Cmmm , Z = 2, a = 5,657(1) Å,…
An optical method for investigating the dynamics in free-standing films of ferroelectric liquid crystals in the range 10 to 105 Hz by means of optical reflectivity is presented. The experimental results were obtained in the linear-response regime applying electric a. c. fields of strengths less than 16 V cm 1. By meas…
The seminal theory of singular surfaces propounded by Hadamard and Thomas is examined within the context of the dynamics of a solid-liquid interface. It is shown that most of the hypotheses upon which Clapeyron’s equation is based can be weakened and two generalized versions of it are derived: with and without curvatu…
We consider the statics and dynamics of N identical magnetic dipoles, with inertia, pinned at the corners of a regular polygon with N sides. We show that at equilibrium all dipoles are aligned tangent to the circumscribed circle. We find the normal modes and frequencies for oscillations about equilibrium, and discuss…
The trend in pressurized water reactors (PWR) toward higher burnups, increasing lithium concentrations, and higher coolant temperatures imposes a demand for better fuel cladding corrosion and hydriding properties. There is a lack of reliable and fast in-situ techniques to investigate zirconium alloys in high-temperatu…
The effect of irradiation by 300-keV Ar + ions on the properties of electrochemically produced porous silicon is studied at doses of 5×10 14 –1×10 16 cm −2 . Raman scattering and photoluminescence data are used to show that the radiation hardness of porous silicon layers is substantially greater than that of single cr…
The compounds (trienH 2 )[Mn(H 2 O) 3 X 3 ]X · H 2 O(X = Cl,Br) crystallize at room temperature from equimolar solutions of triethylenediamine and MnX 2 · 4 H 2 O in 3M HX in the orthorhombic space group P2 1 2 1 2 1 with a =6.828( 1), b = 12.128(2), c = 18.367(4) Å, Z = 4 for the chloride, and a = 7.001 (1), b = 12.6…
Phase transformations from α– to ß–SiAlONs (i.e., from α′ to ß′) have been recently reported in a number of rare‐earth SiAlON systems during postsintering heat treatment. In the present work, this transformation process in a Sm (α+ß)‐SiAlON material is studied by using XRD, TEM, and EDS X‐ray mapping techniques. It is…
The binary mixture of cholesteryl nonanoate(CN) and 4,4′-hexyloxy azoxy benzene (HOB) exhibit a very interesting sesophases like blue phase, twisted grain boundary (TGB) phase, induced smectic A, smectic C and smectic B phases at different temperatures when the mixture is cooled from isotropic phase. The existence of…
In a previous study we describe a high flow, Cl2-rich dry etch (DE) process which yields fence-free Pt etch structures. In that work we identify the existence of a transient fence defect, and show that it can cause the formation of an extremely shallow sidewall in the fully etched structure. We now expand upon this ef…
Ferroelectric bismuth layer oxide SrBi2Ta2O9(SBT) thin films were deposited on Pt/Ti/SiO2/Si substrates by rf magnetron sputtering at 500°C and then, were annealed at 850°C for 1 hr in oxygen ambient. The remanent polarization(2Pr) and the coercive field(2Ec) of a 300nm thick SBT film deposited in 10mtorr were 18.5 μC…
Blends of NR with ENR have been prepared in full composition following the polymer blend technique. Basic properties (mastication behavior and thermal degradation of each rubber and Mooney viscosity, Flory-Huggins interaction parameters, and cure characteristics of the blends) of the uncured blends were determined, in…
Abstract Charging currents, J-V characteristics and electron conductivity have been measured in triglycine sulphate along three crystallographic directions: a, b and c. The measurements have been taken in a wide temperature range between −196°C and 80 °C. It is found that the charging currents have short relaxation ti…
Temperature dependent soft mode part of the complex dielectric constant has been measured as a function of bias electric field both in the smectic C* and smectic A* phases for a ferroelectrc liquid crystal (FLC) mixture. From the experimental data, soft mode relaxation frequency and dielectric strength have been deter…
A vibrational study of the local anesthetic procaine hydrochloride in the solid state and in aqueous solution was carried but. Assignment of the amino groups was performed using deuterated and non-deuterated samples. All the bands in the spectra were identified and assigned. The structure of the procaine cation was de…
Abstract Hydrogen-bonded columnar structures have been observed in tetrakis(t-butylammonium) diperoxotetramolybdate(4−) (1) and -tungstate(4−) (2). 1, [(CH3)3CNH3]4[Mo4O12(O2)2], crystallizes in the tetragonal space group with a = 16.312(2), c = 6.352(1) Å, V = 1690.2(5) Å3, Z = 2. 2, [(CH3)3CNH3]4[W4O12(O2)2], crysta…
This paper examines the topology of two-step braided fabrics incorporating rigid rods in the axial direction. Fabricated by pultrusion, the 1-mm diameter rods are composed of unidirectional Kevlar fibers and vinylester resin. A modified two-step braiding set-up designed to incorporate the rods is developed. In compari…
Summary Citrate forms strong complexes with A1 ions and may thus influence the stability and formation of Clay‐A1 hydroxide polymer systems (CAIHO). We studied the adsorption of citrate to CAIHO and the influence of citrate on the stability and formation of CAIHO at different A1:clay and A1:citrate ratios and pH value…
The enhancement of miscibility at the lower critical solution temperature (LCST) of the blends poly(vinyl chloride)/poly(ethylene-co-vinyl acetate) (PVC/EVA), poly(vinyl chloride)/poly(styrene-co-acrylonitrile) (PVC/SAN) and poly(vinyl chloride)/poly(ethylene-co-vinyl acetate)/poly(styrene-co-acrylonitrile) (PVC/EVA/S…
We present a new, extremely sensitive optical method to study the nematic-smectic-A (NA) phase transition in liquid crystals. In this new technique, we monitor nematic director fluctuations as a function of temperature as we approach the NA transition. We show that the NA transition in the liquid crystal 8CB (which ha…