Materials Literature
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A new microbolometer for far-infrared detection has been fabricated that allows an increase in sensitivity of a factor of 4 over the best previously reported bolometer. By suspending the detector in the air above its substrate a reduction in the thermal conductance out of the device by a factor of 5 has been achieved.…
Angle-resolved photoemission spectra of a black-phosphorus single crystal have been measured with very high angular resolution using He I and Ne I resonance lines. The experimentally determined band structure has been compared with the self-consistent pseudopotential calculations. Some special points and bands with al…
Heterojunctions have been prepared by the reactive rf, sputter deposition of n-ZnO on sputter-etched n- and p-type silicon substrates. Measurements of conductance show typical low-reverse breakdown at 18–25 V and forward currents of 2–10 mA at 3 V, both n-n and p-n diodes rectify. At low forward bias, 0–0.3 V, both ty…
We present a series of measurements of a fluctuating perturbation in the angular correlation of $^{111}\mathrm{Cd}$ in ${\mathrm{In}}_{2}$${\mathrm{O}}_{3}$ powder samples. We analyze the temperature dependence of the associated hyperfine parameters and conclude that this perturbation arises from "aftereffects" follow…
The electrical resistivity of thin gold films deposited on amorphous substrates is found to increase with decreasing film thickness. The temperature-dependent part of the resistivity, however, is independent of the film thickness. This observation cannot be reconciled with existing theories that deal with surface scat…
Hyper-Raman scattering from KTa${\mathrm{O}}_{3}$ is studied to obtain the frequencies and linewidths of the seven optical $\ensuremath{\Gamma}$ phonons with a high degree of accuracy. Particular attention is paid to the soft-mode region below 150 ${\mathrm{cm}}^{\ensuremath{-}1}$. We confirm and extend the data found…
Various experiments which involve the joint application of dc and ac driving fields, $V={V}_{\mathrm{dc}}+{V}_{\mathrm{ac}}cos(\ensuremath{\omega}t)$, are reported for the charge-density-wave (CDW) state of the linear-chain compound Nb${\mathrm{Se}}_{3}$. Steps are observed in the dc $I\ensuremath{-}V$ characteristics…
Thin films of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) develop low electrical resistivity (<10−3 Ω cm) after irradiation with 2-MeV Ar+ ions. Electron microscopy and diffraction show that vacuum-deposited films of this material consist, prior to ion-irradiation, of discrete crystalline grains (∼20–5…
The creation of a field-controlled variation of the index of refraction in a liquid crystal cell has been analyzed and experimentally verified. To obtain a spherical lens utilizing a simple electrode structure and capable of focusing arbitrary incoming polarizations requires four flat nematic liquid crystal cells. Wit…
Resonance and preresonance Raman spectra of Mn and Sc containing argon matrices are reported. For scandium, we assign the progressions to the diatomic and triatomic molecules. The former is found to have vibrational constants ω″e=239.9 cm−1 and ω″ex″e=0.93 cm−1. The latter is best described as an equilateral or near e…
In the present low-energy electron-diffraction (LEED) study of the copper (111) surface the inner potential and the surface relaxation are determined independently from the subthreshold effect and from Bragg-type diffraction. A "subthreshold effect" is a narrow LEED intensity structure occurring at a setting where new…
We define the concept of lattice match for any pair of crystal lattices in any given crystal direction, allowing for a periodic reconstruction of the interface. An algorithm for a systematic search for all possible matches is developed, and some examples of nonstandard lattice matches are given for CdTe on GaAs and sa…
Recent work on well-characterised iron-carbon alloys has shown that the attenuation characteristics of high frequency ultrasonic waves depend on the mean grain size, the grain size distribution and on a damping term that has been associated with dislocations. Methods of analysis of the attenuation spectra are presente…
The average internal magnetic field H i inside a multidomain (MD) grain is the sum of the applied field H o and a demagnetizing field involving the demagnetizing factor N of the grain. It is shown that N MD governing MD wall displacements is not the same as N SD for single‐domain (SD) rotations of the same grain when…
AC susceptibility and 57 Fe Mossbauer spectroscopy measurements are reported for Fe 2+ aluminosilicate glasses. The frequency dependence of T f (over a range from 10 to 10 8 Hz) is described by a Fulcher law. This indicates a progressive spin freezing at T f , comparable with results reported in Co and Mn aluminosilic…
To quantitate the concentration of fibronectin in blood components to determine if the fibronectin present in liquid and frozen stored blood products deteriorates in vitro, we measured the concentration of this opsonic protein at the beginning and at the end of storage. In addition, electroblotting studies were perfor…
In order to investigate the effects of environmental factors on the atmospheric corrosion of carbon steel in Toyosaka city, Niigata prefecture, the rate of corrosion and the cocentrations of chemical pollutants in atmosphere were determined at 15 sites and the data of some meteorological elements were obtained for thr…
The kinetics of the reaction of both the tetragonal and orthorhombic modifications of lead(II) oxide with hydrogen bromide at a pressure of 1.33 kN m–2 have been studied in the temperature range 398–548 K. Additionally, the reaction with the orthorhombic modification has been examined at HBr pressures of 0.67, 3.33 an…
Experiments have been conducted at ORNL with highly irradiated light-water reactor (PWR and BWR) fuel rod segments to investigate fission product release in steam in the temperature range 500 to 2000/sup 0/C. Objectives were to quantify and characterize the releases under conditions postulated for LOCA) and severe acc…
Commercially pure aluminum specimens were anodically oxidized in a 13M H2SO4 solution at 20°C by applying a constant current density of 1A·dm-2, the voltage attained being 36-38V. The composition and properties of the oxide formed were investigated by chemical analysis, electrochemical techniques, thermogravimetric an…