Showing papers in "Materials Research Bulletin in 1998"

TL;DR: In this article, it was found that zinc metatitanate, ZnTiO 3, decomposes into zinc orthotitanate and rutile on heating above 945°C.

TL;DR: In this paper, the synthesis of red inorganic ceramic pigments by inclusion of hematite in a fumed silica matrix was studied and a continuos change in colour was measured by comparing L-a-b values of the calcined samples and more information were obtained by the Kubelka-Munk absorption function.

TL;DR: In this paper, a new direct consolidation method based on the properties of starch in water was developed for the transformation of a stable suspension into a rigid and stiff body that can be machined in the green state.

TL;DR: In this article, Fe3O4 particles of nanometer size were hydrothermally synthesized from iron(II) 2-methoxyethoxides (Fe(OMOE)2), using 2mETHoxyethanol (MOE) mixed solvent as the medium.

TL;DR: In this paper, the effects of factors such as the KOH concentration, reaction temperature, and time were investigated for La2M2O7 (M = Ti, Zr) powders, which have been hydrothermally synthesized from double hydrous oxides La2O32MO2nH2O using KOH as the mineralizer.

TL;DR: In this article, the effect of three levels of zirconia additive on the anatase-rutile (A→R) transition in a sol-gel-derived powder was investigated using differential thermal analysis and X-ray diffraction.

TL;DR: In this article, a new single phase of composition Bi3NbO7 has been isolated in the binary system Bi2O3-Nb2O5, and the final reliability index is R = 0.027.

TL;DR: Palladium complexes present in PdCl2 aqueous solutions of various acidity have been introduced into polyaniline in the polyemeraldine base form (PANI) as mentioned in this paper.

TL;DR: In this article, the luminescence behavior of rare earth complexes in silica gels was studied in comparison with the corresponding solid-state complexes by means of emission, excitation spectra, and Lifetimes.

TL;DR: In this article, a bone-like apatite layer was formed on the surface of the TiO2 photocatalysts, which was used for antibacterial and environmental purification purposes.

TL;DR: In this paper, α-Fe2O3 and Fe3O4 particles were prepared through a hydrothermal process at 150°C from a (NH4)2SO4·FeSO 4·6H2O solution in the presence of hydrazine.

TL;DR: In this article, the coordination numbers and the cation-anion distances in Mn 3 O 4, γ-Mn 2 O 2.78, and α-mns 2 O 3 obtained by EXAFS (extended X-ray absorption fine structure) were compared.

TL;DR: In this article, an ambient pressure method for drying sol-gel materials has been used to synthesize highly porous vanadium oxide and molybdenum oxide materials with aerogel-like properties.

TL;DR: In this paper, the results showed that phosphorus can be incorporated in a wide range of concentration levels into the aluminum oxide layers, which increased the growth and H3PO4 etch rates of the films.

TL;DR: The phase morphology of nickel sulfide (NiS) has received attention because of the possible correlation between fracture of toughened window glass panels and the α-β phase transition.

TL;DR: In this article, β-In 2 S 3 powders with an average size of 13 nm and spherical shape have been successfully prepared through the hydrothermal treatment of a sol from indium trichloride and sodium sulfide at 140°C.

TL;DR: In this article, large tetragonal hen egg white lysozyme single crystals (up to 16 mm3) were obtained by the counter-diffusion method, using high concentration silica gels.

TL;DR: In this article, the effect of the surfactant capping on the grain growth of the zinc ferrite nanoparticles was investigated, and it was observed that the zinc particles with a capping layer could readily be dispersed in some organic media due to their surface modification.

TL;DR: A wet procedure to prepare stoichiometric and homogeneous PZT powder (Pb(Zr052Ti048)O3) is described in this article, where starting reagents are tetra-n-butyl zirconate, titanate, and lead acetate.

TL;DR: In this article, a solid phase having hydrotalcite-like layered structure (phase I) of Mg and Al layered double hydroxide with interlayer carbonate (Mg/Al/CO3-LDH) is not stable in in situ high temperature powder X-ray diffraction patterns when the temperature of solid samples is elevated.

TL;DR: In this paper, the effects of UV irradiation on the properties of xAl{sub 2}O{sub 3} {center_dot} (100 {minus} x)SiO-sub 2 gel films, which were obtained from aluminum butoxide chemically modified with benzoylacetone and partly hydrolyzed silicon ethoxide, have been studied.

TL;DR: A rod-like ultrafine powders of Bi 2 S 3 with a diameter of 40 nm and a length of up to 150 nm were successfully prepared by the hydrothermal treatment of an alkaline sol (pH = 80-100) from BiCl 3 and Na 2 S·9H 2 O with EDTA as complexing agent at relatively low temperature powder X-ray diffraction (XRD) pattern indicated that the product was pure orthorhombic Bi 2S 3 phase with cell constants a = 11138, b = 11290, and c

TL;DR: In this paper, the effects of load and time on Vickers indentation responses of an acrylic polymer are presented, and the hardness of this material is shown to be time dependent as a result of viscoelastic flow and relaxation processes.

TL;DR: In this article, the dielectric properties of polycrystalline ceramics in the binary Ca 2 Ta 2 O 7 −Ca 2 Nb 2 O7 system were reported.

TL;DR: In this paper, the size of the spinel particles is related to the functionality of the double alkoxide and it is proposed that the double-alkoxide allowed pure spinel nanosized materials to be obtained.

TL;DR: In this article, a new polymorphic form of bismuth oxide (Bi 2 O 3 ) is synthesized by a high-pressure technique (6 GPa and 880°C, and subsequently slow cooling).

TL;DR: In this article, powder X-ray diffraction and optical studies were performed to characterize the fundamental structural aspects and determine the energy band gap Eg of several compositions of the Cu(In 1-x Ga x ) 3 Se 5 semiconducting system.

TL;DR: In this article, a tunable color emission was achieved through forming solid solution between ZnGa2O4 and CdGa 2O4, i.e., Zn1−xCdxGa2 O4, where the solid solubility limit was found to be 0.6 mole fraction.

TL;DR: Transparent anatase TiO 2 -based multilayered photocatalytic films on porous alumina and glass substrates were synthesized via a sol-gel process as discussed by the authors.

TL;DR: In this article, uniform α-Fe2O3 nanoparticles were prepared by forced hydrolysis of ferric salts with different conditions under microwave irradiation, and products of different morphologies were characterized by TEM.