Showing papers in "Journal of Physics and Chemistry of Solids in 1989"

TL;DR: In this article, a single crystal of n -type Bi 2 Te 2..85 Se 0.15 with the composition of a useful thermoelectric cooling material was grown by the Bridgman technique.

TL;DR: In this article, the effect of anionic as well as cationic substitution on the electronic structure of the chromium ions is discussed and compared with previous results on the corresponding oxy-spinels.

TL;DR: In this paper, the defect structure of undoped CuInS2 was revealed by combining the studies of electrical, photoluminescence and stoichiometric analyses, and the ionization energies were determined to be 0.038, 0.68 and 0.145eV for the sulfur vacancy, indium interstitial and indium occupying the copper vacancy, respectively.

TL;DR: The phase transition in terbium vanadate (TbVO 4 ) was studied at room temperature by high-pressure Raman spectroscopy in a diamond anvil cell.

TL;DR: In this paper, the first detailed study of the valence band spectra of indium oxides is presented as part of an XPS examination of the surface chemistry of these systems, and features attributable to In2O3 (india) are analyzed and compared with those for other Group IIIA and IVA oxides.

TL;DR: In this paper, isothermal equations of state (EOS) with pressure, p, as the independent and relative volume, V/V 0, as the dependent variable are used for the pressure calibration of EXAFS data taken at p ⩽ 10 GPa.

TL;DR: In this paper, a comparative study of pure and chromium-doped rutile was performed by means of electrical complex impedance spectroscopy at T = 1273 K for both pure and doped rutsile in the oxygen partial pressure range from 10 −12 to 1 atm.

TL;DR: In this paper, the authors examined polycrystalline Ni-Ga and Ni-In intermetallic compounds for X-ray photoemission spectroscopy and observed valence-band spectra for all the compounds are very similar to those for elemental Ni; those for Ni 3 Ga and NiIn agree rather well with the bandstructure calculations of Kubo and Wakch.

TL;DR: In this article, the authors suggest that condensations of M 1 and M 2 phonon modes at the cubic Brillouin zone boundary X point are associated with the successive cubic-tetragonal-monoclinic phase transitions in ZrO 2.

TL;DR: In this article, the structure of dehydrated Na-exchanged LZ210 and hydrated KGaY zeolites were determined using X-ray powder diffraction methods, and it was inferred that the cation distribution at high cation loadings is largely determined by the interaction energy of the cations on adjacent sites I and I'.

TL;DR: In this paper, atomistic computer simulation techniques have been employed to study the non-stoichiometry of the alkaline earth titanates with excess alkaline Earth oxides.

TL;DR: In this article, the authors described the kinetics of surface segregation in a binary alloy by setting up and solving a system of rate equations using the change in Gibbs free energy between adjacent cells as atoms are interchanged between these cells.

TL;DR: In this article, the authors used the Electronegativity Equalization Method (EEM) for calculating the charge distribution and the average effective electronegativity for aluminophosphate-type framework structures and the results compared with those of silica-polymorphs.

TL;DR: In this article, the a.c. conductivity σ ac (ω), is found to be proportional to ω s in the low temperature region suggesting the validity of the tunneling model as reported in Part I.

TL;DR: In this paper, electrical conductivity measurements of pure and doped platinized titania were conducted to obtain a qualitative estimate of alterations of the Fermi energy level of electrons of the carrier upon doping.

TL;DR: In this paper, the luminescence spectra and decay curves of Te 4+ -doped A 2 ZrCl 6 (A = Cs, Rb, K) were reported and the vibrational frequency derived from the temperature dependence of the A band splitting is equal to the one obtained from the vibration progression in the emission band and corresponds to the frequency of the e g mode of the TeCl 2 6 − octahedron.

TL;DR: The results of ESR and DRS spectroscopies on zeolites are discussed for three themes: (1) the coordination of Cu2+ to oxygen six-rings; (2) the formation of Ni+; and (3) charged Ag-clusters as discussed by the authors.

TL;DR: In this article, chemical vapor deposition (CVD) techniques developed for the fine control of pore-openings of zeolite are reviewed, where Silicon methoxide is used to deposit ultra thin layers of silica on the external surface of the zeolites.

TL;DR: In this article, the luminescence of ScBO 3 −Pr 3+ is investigated and the emission consists of four spin-allowed transitions and one spin-forbidden transition from the 4 f ; 5 d to the 4 F ; 2 configuration.

TL;DR: In this article, the absorption, fluorescence and excitation spectra of CaWO4:Tb3+ single crystal were studied at 300 and 77 K, respectively, and the polarization studies on laser excited fluorescence spectra were also carried out at 77 K.

TL;DR: An extended version of the Mie scattering theory, which includes non-local effects as well as the size quantization of the excitonic states, is applied to the calculation of the extinction spectra of small semiconductor spheres as discussed by the authors.

TL;DR: In this paper, the authors studied the conductivity relaxation process of the (CeO 2 ) 1− x -(Y 2 O 3 ) x [where x = 0 to 0.2] system as a function of temperature.

TL;DR: Theta-1, ZSM-23 and ECR-1 have been reported in this article, as well as other zeolite structures such as Theta-2, Theta1 and ZSM23.

TL;DR: In this paper, the authors report 19 F NMR studies at 282 MHz on the single crystalline fast ionic conductor LaF 3 from 130 to 490 K. From their high resolution data and from a comparison with computer simulated dipolar spectra, they are able to identify the signals from different fluorine sublattices, and to analyse their motional behaviour and their chemical shifts as a function of temperature.

TL;DR: In this article, the luminescence properties of the Gd3+ ion in lanthanide borate glass were investigated and compared with those of Gd 3+ in crystalline LaB3O6:Gd3+.

TL;DR: In this paper, the ternary iron sulfides, monoclinic TlFeS2 (linear tetrahedral chains) and orthorhombic tl3Fe2S4 (folded tetrahedra), have been investigated by means of magnetic susceptibility measurements, powder neutron diffraction, and Mossbauer spectroscopy.

TL;DR: In this article, the thermodynamic and kinetics of the HS ⇌ LS equilibrium in the iron spincrossover complexes [Fe(2-pic)3]-PF6)2(2pic = 2-aminomethylpyridine) and [Fe (6-mepy)3tren]-PF 6 )2 ((6- mepy), tris[4]-(6-rmmethyl)-2-pyridyl]-3-aza-3-butenyl]amine) have been studied by pressure dependent Mossb

TL;DR: The magnetic susceptibilities of 25 isotypic lanthanoid (Ln) compounds were determined with a Faraday balance between 15 K and room temperature in this article, and the highest Curie temperatures were observed for those compounds with the highest magnetic moments.

TL;DR: In this paper, a method called constant stoichiometry cooling is presented to obtain homogeneous equilibrium samples with different stochastic parameters, where the samples obtained are very homogeneous as no bulk oxygen transport has to occur during cooling.

TL;DR: The Eu 3+ −F − charge transfer transition is expected at 60-65 kK and has been observed in CaF 2 at 66 kK as discussed by the authors, and the Eu 4+F −charge transfer transition was observed at 66kK.