Showing papers in "Materials Research Bulletin in 1996"

TL;DR: In this paper, a straightforward combustion synthesis technique to prepare submicron calcium aluminates using the corresponding metal nitrates-urea mixtures, at low temperature and short reaction times, was discussed.

TL;DR: In this paper, the dielectric properties of the hexagonal perovskite oxides, La4BaTi4O15, La 4Ba2Ti5O18 and Ba5Nb4O5O15 have been characterized at microwave frequencies.

TL;DR: The electrical anisotropy of layer-structured bismuth titanate (Bi 4 Ti 3 O 12 ) has been investigated by measurements of Seebeck coefficient, dielectric permittivity, DC conductivity, and complex impedance on single and polycrystalline samples as mentioned in this paper.

TL;DR: In this article, the effects of grinding and sintering processes on the Seebeck coefficient, electrical conductivity, and thermoelectric figure of merit were investigated for different particle sizes.

TL;DR: In this paper, the deintercalation of calcium from the interlayer of CaSi 2 was performed by using concentrated HCl solutions at low temperatures, 0 and −30 °C.

TL;DR: The phase diagram of the nonstoichiometric oxide SrCo 0.8 Fe 0.2 O 3 − δ has been determined as a function of temperature (550 °C ≤ T ≤ 900 °C) and oxygen partial pressure (0.015 atm ≤ pO 2 ≤ 1 atm) by thermogravimetric analysis as discussed by the authors.

TL;DR: In this article, the thermal stability of stoichiometric spinel phases in the system Li{sub 1+{delta}}Mn{sub 2{minus}delta]O{sub 4} (0 {le} {delta}{le} 0.33) has been investigated by high-temperature powder X-ray diffraction, differential thermal analysis, and thermogravimetric analysis.

TL;DR: In this article, the effect of temperature on the plane-wave SE of a lightly doped (0.006 M p-TS) polypyrrole (PPy) film was also investigated.

TL;DR: In this article, the ion exchange properties of the sodium birnessite Na0.32MnO2,yH2O were investigated and compared with previous data obtained for some compounds and in relation with mechanism invoked for Li electrochemical insertion into solgel and chemical birnessites.

TL;DR: In this article, the photoluminescence spectra of Eu3+-doped lanthanide oxysulfide [Y2O2S, La2O 2S, and Gd 2O2 S] powder phosphors have been analyzed and the richness of the red color has been verified by determining their color coordinates from the CIE standard charts.

TL;DR: In this article, the structures and luminescent properties of a series of Eu2+ doped Ba and Sr borates have been investigated and a simple structural relationship is established that distinguishes violet and blue emitting compounds from those that emit at longer wavelengths (> 500 nm.

TL;DR: In this article, the insertion loss, return loss and electromagnetic shielding effectiveness of carbon-black and carbon-fiber-filled polypropylene composites were studied in the 8 to 12 GHz frequency range.

TL;DR: In this article, the luminescence properties of Y2SiO5 and energy transfer from Ce3+ to Tb3+ were studied in two modifications of the crystal structure, low temperature X (1) type and high temperature X(2) type.

TL;DR: Yttrium oxide doped with trivalent europium has been prepared by self-propagating high temperature (SPHT) synthesis, also known as combustion synthesis, with nitrogen-based fuels as mentioned in this paper.

TL;DR: Pyrrole was polymerized in the presence of ultrafine zirconium (IV) oxide (ZrO2) particles which act as a dispersant for pyrrole as mentioned in this paper.

TL;DR: In this paper, an inorganic sol-gel method was developed to produce vanadium dioxide (VO{sub 2}) thin films which exhibit an apparently reversible electrical resistance switching at about 60 C.

TL;DR: In this article, a vanadium oxide thin film has been prepared from an aqueous solution system of (V2O5-HF) with addition of aluminum metal by a novel wet preparation method called Liquid Phase Deposition (LPD).

TL;DR: In this paper, photo-induced second harmonic generation (SHG) and piezooptics were used as the main tools in the investigations of low-temperature optical properties of PbO-Bi 2O3-Ga2O3 glasses.

TL;DR: The crystal structure of the ion-exchangeable layered perovskite compounds K2La2Ti3O10 and Li2La 2Ti 3O10 was determined by Rietveld analysis for the powder X-ray diffraction pattern as discussed by the authors.

TL;DR: In this paper, a new process for submicronic MgO powder synthesis starting with Mg(OCH 3 ) 2 was studied and the influence of various experimental parameters (water to alkoxide ratio, temperature, reaction time) was investigated.

TL;DR: In this paper, triple phosphates of calcium, sodium and trivalent elements (Eu, Nd, Fe) in Ca3(PO4)2-RPO4-Na3PO4 systems were predicted on the basis of crystal chemistry data and synthesized.

TL;DR: In this paper, single crystals of the PbO-B{sub 2}OI{sub 3} pseudo binary system were successfully obtained by a flux method using Pb O-B[sub 2]OI[sub 3] flux.

TL;DR: In this paper, the longitudinal and transversal frequencies of a series of cobaltite spinels were determined from the infrared reflectance spectra of thin layers on a cobalt substrate.

TL;DR: The linear thermal expansion curves did not show any hystersis indicating the absence of microcracking in the sintered bodies of Synroc-B powder as discussed by the authors, which achieved a thermal expansion coefficient of $8.72\times 10^{-6} K^{-1}

TL;DR: In this article, a vacuum infiltration process has been developed to process aluminum-base composites reinforced with particulate SiC{sub p}. Electroless nickel coating of SiC {sub p} was used to improve wetting by molten aluminum.

TL;DR: In this article, the metal cobaltites, MCo2O4 where M = Mg, Mn, Ni, Zn or Cd were obtained from the above complexes as decomposition residues by heating these complexes in a pre-heated silica crucible at 500 °C for about fifteen minutes.

TL;DR: In this article, the layered hosts Na-montmorillonite, MoS2, MoSe2, TiS2 and TaS2 were combined with linear poly(ethylenimine) (LPEI) in aqueous solution.

TL;DR: The compound Sr5TiNb4O17 was prepared and its crystal structure determined by single-crystal X-ray diffraction as mentioned in this paper, which consists of alternating perovskite-like slabs offset with respect to each other by a 2 and c 2.

TL;DR: In this article, nano-sized amorphous molybdenum dioxide powders have been prepared for the first time using γ-ray radiation in ambient pressure and room temperature.

TL;DR: In this paper, the photocatalytic activity in photodehydrogenation of H2S of zinc ferrites synthesized by shock wave loading is investigated and compared with that of zinc preconditioned by calcination.