Materials Literature
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Results of optical birefringence, ultralow-frequency elastic, dilatometric, and dielectric measurements of lawsonite crystals are presented in a wide temperature range including two successive phase transitions $\mathrm{Cmcm}\ensuremath{-}{(T}_{1}=273 \mathrm{K})\ensuremath{\rightarrow}\mathrm{Pmcn}\ensuremath{-}{(T}_…
The elastic moduli of the C15 Laves-phase materials TaV2, TaV2H(D),x and ZrCr2 have been measured using the technique of resonant ultrasound spectroscopy. The temperature dependences of the shear modulus and Young's modulus of TaV2 were found to be anomalous; the moduli increase with increasing temperature over the en…
The purpose of this study is to investigate the preparation and properties of two types of SrBi 2 Ta 2 O 9 ceramics, SrBi 2 Ta 2 O 9 ceramics with excess Bi 2 O 3 , and two-phase ceramics formed with SrBi 2 Ta 2 O 9 and BiTaO 4 . The samples were prepared by a conventional ceramic technique at 900 to 1300°C for 2 h. T…
The heavily doped single-phase polycrystalline ${\mathrm{La}}_{0.825}{\mathrm{Sr}}_{0.175}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{O}}_{3}(0.20<~x<~0.40)$ has been prepared. Above paramagnet to cluster--spin-glass transition temperature, the electron spin resonance measurement suggests that ther…
The effect of partial ${}^{16}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{O}\mathrm{}}}^{18}\mathrm{O}\mathrm{}$ isotope substitution on electrical resistivity and ac magnetic susceptibility was studied for $({\mathrm{La}}_{0.25}{\mathrm{Pr}}_{0.75}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ ceramic samples. The…
Ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS) are used to study the oxidation of a ZrC(100) surface. When the surface is exposed to O 2 at room temperature, carbon atoms in the surface region are found to be depleted and the substrate zirconium atoms are oxidized. The Zr oxide…
A new varistor system of SnO2-Bi2O3-Nb2O5 was reported in this paper. The electrical field-current density characteristics of this system were investigated by doping different amounts of Bi2O3 and sintering the samples at various temperatures. It is found that adding 0.75 mol% Bi2O3 to Nb-doped SnO2 ceramic resulted i…
A single-crystal deuterium NMR study of the phase transition of the incommensurate organic inclusion compound of n-nonadecane in urea is presented. In agreement with diffraction measurements, we found that the urea host sublattice is not significantly modulated in the high-symmetry phase. Whereas at room temperature t…
JAERI is carrying out R&D for constructing the facility of high intensity neutron spallation source which may bring us innovative science fields. A high power proton beam will be injected into the liquid mercury target for the neutron spallation. The mercury container will be subjected to the pressure waves generated…
We report on the linear and nonlinear-optical properties of 4-dimethylamino-4′-nitrostilbene (DANS), 4-diethylamino-1-nitrobenzyl (DANB), and 4-[N-ethyl-N-(2-hydroxyethyl)]amino-4′-nitroazobenzene) (Disperse Red 1;DR1) side chain polymers whose second-harmonic generation at the telecommunication wavelength of 1.55 μm…
High-field antiferromagnetic-resonance (AFMR) spectra were obtained in the frequency range $40 \mathrm{GHz}<\ensuremath{\nu}<700 \mathrm{GHz}$ and for magnetic fields up to 8 T in twin-free single crystals of ${\mathrm{La}}_{0.95}{\mathrm{Sr}}_{0.05}{\mathrm{MnO}}_{3}.$ At low temperatures two antiferromagnetic…
Cs3Sb7 und Cs4Sb2 wurden aus den Elementen dargestellt und ihre Kristallstrukturen auf der Basis von Röntgeneinkristalldaten ermittelt. Cs3Sb7 kristallisiert monoklin in der Raumgruppe P21/c (a = 1605.7(1) pm, b = 1571.1(1) pm, c = 2793.9(2) pm, β = 96.300(2)°, Z = 16) und enthält Anionen Sb73–. In der Kristallstruktu…
We have studied the ground-state properties of Ge-related paramagnetic defect centers in Ge-doped silica. Hartree-Fock and density functional theory calculations have been performed to determine the structure, charge, and spin distribution of paramagnetic defects in Ge-doped silica, in particular a trapped electron at…
In this study, the effect of bismuth content on phase-transition behavior, ferroelectric property, and crystal structure of strontium–bismuth–tantalate (SBT) ceramics was explored with the aid of εr(T), ferroelectric hysteresis loop, x-ray diffraction (XRD), and Raman spectroscopy. Both the phase-transition behavior a…
A number of woven fabrics are selected and their rustling sounds recorded. The spectra forms of these recorded sounds are then obtained by FFT. The level pressure of total sound (LPT) is calculated to evaluate sound loudness of specimens. Level range (Δ L) and frequency differences (Δ f) are used to quantify sound spe…
A gold contact with polypyrrole (PPy) doped with the copper phthalocyanine toluenesulfonate (CuPcTS) anion (Au/PPy-CuPcTS) was studied using complex impedance spectroscopy, current density voltage ( J - V ) and capacitance voltage ( C - V ) measurements. The J - V characteristics of these junctions are asymmetrical an…
A well characterized homogeneous ceramic sample of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{M}\mathrm{n}(}^{57}{\mathrm{C}\mathrm{o})\mathrm{O}}_{3}$ shows two ferromagnetic phases below ${T}_{c}$ in contrast to the 20% Ca compound where only one is observed. One of the phases exhibits stronger exchange interac…
Using Monte Carlo simulations we study the dynamics of three-dimensional Ising models with nearest-, next-nearest-, and four-spin (plaquette) interactions. During coarsening, such models develop growing energy barriers, which leads to very slow dynamics at low temperature. As already reported, the model with only the…
Abstract Analytical electron microscopy of representative smectites from soils and sediments revealed that K was present in significant proportions. It was the major interlayer cation in soils from pelitic rocks, continental and marine sediments, independent of their diagenetic grade. Sodium was predominant only in so…
The effect of Cu substitution for Mn in layered manganese oxides ${\mathrm{La}}_{1.4}{\mathrm{Sr}}_{1.6}{\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{O}}_{7}$ on magnetic and transport properties has been investigated. It is interesting that the undoped samples undergo complex transitions with lowing tempe…