Materials Literature
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Electrostrictive effects in the potassium tantalate niobate solid solution (K(Ta0.55Nb0.45)O3) have been investigated. The electrostrictive coefficients were determined by a strain gauge technique and by the measurement of hydrostatic pressure dependence of dielectric constant near the Curie temperature. The Q values…
The properties of glow discharge µc Si have been investigated by conductivity, Hall effect and field effect measurements as a function of crystallite size and phosphorus doping ratio. It is concluded that the large increase in σ over a-Si is almost entirely caused by an increased carrier density resulting from delocal…
The efficiency of channel electron multipliers (CEM) falls drastically at energies of the incident electrons greater than a few KeV. For conversion Electron Mössbauer Spectroscopy (CEMS) the conversion electron energies are far greater than a few KeV, and the CEM efficiency at 7 KeV, for example, is about 10% determin…
Earlier studies1-3 have shown that in Pb(Sc1/2Ta1/2)O3 PST and Pb(Sc1/2Nb1/2)O3 which are simple cubic perovskites, the degree of ordering of the different B site cations in the ABO3 structure can be controlled thermally. Quenched disordered crystals and ceramics show diffuse dispersive dielectric properties, while we…
Samples of C62500 aluminum bronze were treated by a continuous wave CO2laser to rapidly melt and quench the surface. This processing transformed the surface layer from multiphase\beta' + \gamma_{2} +primary and secondary iron-rich δ to homogeneous, supersaturated single-phase\beta'solid solution. The cavitation erosio…
Abstract The interfacial reaction of NiO and α‐Al 2 O 3 to NiAl 2 O 4 is investigated by means of Rutherford backscattering spectrometry (RBS) using 2.95 MeV He + ions. The NiO is obtained by oxidation at 800°C of a nickel film vapour deposited on to alumina substrates. The reaction of NiO and Al 2 O 3 does not procee…
Successive ferroelectric phase transitions were discovered in CsLiMoO4, CsLiWO4 and RbLiMoO4 single crystals. Strong elastic and no dielectric anomalies were found with temperature lowering in the initial cubic phases. The phase transitions are qualitatively described as pseudoproper ferroelectric ones.
The effects of co-existing atomic and magnetic clustering on electrical resistivity are considered. It is shown that in Cu-Ni alloys such clustering produces competing effects and that while atomic clustering dominates the behaviour in alloys containing more than about 25% Ni, the magnetic clustering effects are predo…
Under a LOCA transient in LWRs, ruptured Zircaloy clad tubes would be oxidized at the inner surface as well as outer surface by steam flowing in reactor core. In order to determine whether the inner-surface oxidation influences mechanical properties of clad tubes during the reflood stage of a LOCA, the ring compressio…
Pyridinoline is a non-reducible crosslink of collagen. The changes in the content of this crosslink during in vitro aging of bone collagen were studied. The pyridinoline content of bone collagen of 6-week-old chick was very low. When the collagen was incubated with physiological saline in air at 37 degrees C, the pyri…
The T,E-diagram of three ferroelectric phases of BaTiO3 crystals in the temperature range from 0°C to −170°C has been experimentally determined up to 600 kV/cm.
The influence of crystallinity and stereoregularity on the infrared (IR) spectrum of atactic PVC in the solid state has been studied by many researchers [1-12]. Although the molecules in commercial PVC consist of both syndiotactic and isotactic sequences, the bulk polymer is not highly stereoregular, having approximat…
The results of magnetic measurements performed on (Gd x Y 1-x )Fe 3 compounds, in the temperature range 4.2K-1300K, are reported. The YFe 3 compound is ferromagnetic. Replacing Y by Gd, the iron magnetisation is oriented antiparallel to that of the gadolinium. The two magnetisations compensate at the composition x app…
Abstract Core electron binding energies E B with respect to the vacuum level and their chemical shifts are calculated for the least bound core levels of cations and anions of cubic A N B 8− N semiconductors. Starting from the HF‐binding energy of the free atom absolute values of E B are obtained by adding core level s…
Abstract A hydrate of cellulose II can be formed by swelling Fortisan fibers in hydrazine and then washing in water. The hydrate is stable at 93% relative humidity and has a monoclinic unit cell with dimensions a = 9.02 Å, b = 9.63 Å, c = 10.34 Å, and γ = 116.0°; the space group is P 2 1 . The unit cell contains disac…
MSbO4, (M = Cr, Fe) are tetragonal, rutile-type compounds, P42/mnm (No. 136); Z = 1. M and Sb are randomly distributed in 2(a) positions and O in 4(f). For CrSbO4, Dm = 5.31, Dx = 5.35 Mg m−1, a = 4.5899 (2), c = 3.0525 (2) Å, U = 64.307 (8) Å3, x = 0.318, R = 4.6; Cr and Sb are coordinated with two O atoms at 2.064 a…
A PVC plastisol is a suspension of fine particles of poly(viny1chloride) in a plasticizer [1]. The particle size varies typically in the range from 15 to 0.2 um, but it may contain larger and smaller particles also. The sizes in the order of 1 urn and smaller are the primary particles produced by polymerization. The l…
Observations of cleavage fracture in some fcc materials are briefly described. The results suggest that cleavage fracture is not an ‘atomically brittle’ process but occurs by alternate slip at crack tips in conjunction with formation of very small voids ahead of cracks. It is proposed that environmentally induced clea…
The electronic transport properties of chalcogenide glasses of the type Ge-Se and Ge-Te to which foreign elements such as Bi, As, Cu and In are added, were investigated. Glasses of the (GeSe3.5)100-xBix system show a transition from p to n-type conduction at x ≈ 7 at. % Bi as evidenced by thermo-power measurements. Th…
Abstract A study was made on the stress relaxation behavior at 25°C of poly(methyl methacrylate) in uniaxial tension as a function of physical aging at both room temperature and 60°C. Test specimens were compression molded at 165°C, then quenched to room temperature and allowed to age for up to 30 days prior to testin…