Showing papers in "Journal of Physics and Chemistry of Solids in 1997"

TL;DR: In this paper, hot-pressed samples of the semiconducting compound β-Zn4Sb3 were prepared and characterized by X-ray and microprobe analysis.

TL;DR: The electrical properties and defect structure of selected compositions in the SrTi1−xFexO3−y system (x = 0-0.8) have been studied using van der Pauw 4-point conductivity measurements and electron energy loss spectroscopy (EELS) as mentioned in this paper.

TL;DR: The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties, and it appears to play a major role in the physics of the high-Tc superconductors, particularly since recent photoemission studies have found that the VHS is close to the Fermi level in most of the cuprates near the composition of optimum Tc as mentioned in this paper.

TL;DR: The Young's modulus and the shear modulus are comparable to that of the diamond, but the bulk modulus is almost twice as large as the diamond's as mentioned in this paper.

TL;DR: In this article, the decay times of Eu 2+ in several host lattices have been studied, and it is shown that the radial integral varies by 20% from the mean value of 0.81 A. This is in agreement with the large Stokes shifts or a low energy position of the 4f 6 5d state.

TL;DR: In this paper, the structure of multilayer carbon nanotubes is studied using digital image analysis to interpret high resolution TEM lattice images containing 002 and 100 fringes, in comparision with very thin vapour-grown carbon fibres with nanometer-sized diameter (nanofibres).

TL;DR: In this paper, the electrical conductivity and thermopower properties of undoped oriented TiO 2 single crystals were investigated using a Jonker-type analysis and the energy gap was determined (E g = 3.09 − 1.33 × 10 − 3 T/eV).

TL;DR: In this article, high pressure diffraction studies were carried out at high pressure on AlN, GaN and InN in a diamond-anvil cell using synchrotron radiation and an imaging plate detector.

TL;DR: In this article, the lattice parameters of hexagonal graphite-like boron nitride (hBN) have been measured in the temperature range from 300 to 1800 K up to 7 GPa using energy-dispersive powder diffraction of synchrotron radiation.

TL;DR: In this paper, the carbon particle structures which are transformed by ejection of pentagonal and neighboring carborn rings, under high electron irradiation, are flexible and can be moulded via energy minimization into quasi-spherical arrangements.

TL;DR: In this paper, the authors used laser desorption mass spectrometry to produce thin films of C60 in which up to 50% of the fullerenes contain an alkali ion.

TL;DR: In this article, completely textured ZnO thin films were achieved on (001) α-SiO2 single crystalline substrates at moderate substrate temperatures of 225-500°C.

TL;DR: In this article, the heat capacities of cerium and lanthanum zirconate (Ce 2 Zr 2 O 7 and La2 Zr O 7 ) were measured from 4 to 400K by adiabatic calorimetry.

TL;DR: In this article, the authors used an automatic iterative procedure to calculate the electromechanical coupling factor of the thickness mode resonance from X-ray diffraction data of thin ceramic disks.

TL;DR: In this article, the nanostructure of nanowders is divided into a crystalline component and a disordered component, and the results show that the particles can be divided into disordered and orthorhombic SnO 2 phases.

TL;DR: In this article, phase behavior of strontium and lead carbonates under quasi-hydrostatic conditions has been studied in a diamond-anvil cell up to 420 kbar at room temperature.

TL;DR: By using the chemical bond theory of dielectric description and electronic structure of 3D elements, the mechanism of nephelauxetic effect is studied, and the main factors responsible for this effect are identified as mentioned in this paper.

TL;DR: In this article, the crystal structure and magnetic properties of a new modification of copper molybdate (γ-CuMoO 4 ) are reported, which is stable below 200 K.

TL;DR: In this paper, a comprehensive study of the partial replacement of tellurium by molybdenum in Ag 2 O was carried out through X-ray diffraction, differential scanning calorimetry, electrical conductivity, Xray photoelectron spectroscopy and infrared spectrograph measurements.

TL;DR: In this article, the conditions under which the thermal pressure, PTH, is independent of volume in solids were investigated, and it was shown that PTH is independent at ambient conditions for NaCl and Mg2SiO4, but not for MgO, gold, or Al2O3.

TL;DR: The role of Mn cations in the magnetic coupling process has been discussed in this paper, where the cation distribution over the tetrahedral and octahedral sites in the spinel structure has been determined; the inversion parameter v = 0.87.

TL;DR: In this article, the multiphonon relaxation rates for the 5 D 2 level of Eu 3+ have been analyzed with a point charge nonlinear relaxation mechanism proposed recently.

TL;DR: In this article, the effect of substitution and hydrostatic pressure on lithium ion conductivity in polycrystalline Ln 1 2 Li 1 2 TiO3 was investigated and the ion conduction mechanism in perovskite-type oxides was elucidated.

TL;DR: In this article, the anomalous optical responses and structural variations of Fe 2 O 3 nanoparticles coated with a layer of stearates are correlated, which are originated from the quantum confined polaronic state evidenced by spectroscopic characteristics.

TL;DR: In this article, Clausius-Mossotti's formula has been used to fit the observed optical values to the calculated ones using a strict solution of Maxwell equations, which shows good correspondence, in peak positions and intensities to that of solution in hexane, except for the structure from 2.3 to 3.0 eV.

TL;DR: In this paper, the Raman spectrum of defect-fluorite yttrium niobium oxide solid solutions Y 100− x Nb x O 150+ x (20 ≤ x ≤ 25) was characterized.

TL;DR: In this article, the formation and characterisation of rare gas C 60 interstitial compounds of Ar, Kr and Xe was reported, which were produced by hot isostatically pressing (HIP) the fullerene solid at temperatures between 200 and 550 °C and under rare gas pressures in the range 170-200 MPa.

TL;DR: In this paper, the authors used a combination of a synchrotron white X-ray source and a large volume press (MAX80) to investigate the compressive behavior of FeS at room temperature up to 15 GPa.

TL;DR: In this article, the wavevector and frequency dependent dielectric functions of zincblende and wurtzite GaN were calculated based on empirical pseudopotential band structures.

TL;DR: In this paper, the band structures of FeS and FeS 2 including the S 3 s and 3 p and the Fe 3 d and 4 s states are calculated in the tight-binding approach.