Showing papers in "Materials Chemistry and Physics in 1999"

TL;DR: In this paper, an extensive review of thin film materials prepared during the last 10 years is given to demonstrate the versatility of the chemical spray pyrolysis technique and various conditions to obtain thin films of metal oxide, metallic spinel oxides, binary, ternary and quaternary chalcogenides and superconducting oxides are also given.

TL;DR: The state of the art of novel electronically conducting polymeric materials is presented in this article, where the special emphasis is laid on the electrochemical synthesis of conducting polymers (CPs) including the choice of the monomers and solvents, supporting electrolytes and electrodes and structural aspects of these novel materials and the nature of the dopants which induce electrical conductivity in conjugated organic polymers.

TL;DR: In this paper, the structural features of Fe/Ti mixed oxide fired at different temperatures (500, 700 and 900°C) have been investigated by XRD, Mossbauer effect, FTIR, SEM and TEM studies.

TL;DR: In this paper, a new colloidal processing method for near net shaping ceramic components is outlined, which relies on electrostatic stabilized ceramic suspensions and it’s destabilization by time delayed in situ reactions.

TL;DR: The first example of atomic layer-controlled growth or atomic layer epitaxy on a polymer substrate was reported in this article, where the growth was accomplished by separating the CVD reaction, Zn(CH 2 CH 3 ) 2 ǫ+H 2 Oǫ→ ZnO+2CH 3 CH 3, into the following half reactions: (A) Zn−OH * ǒ + Zn+Zn−Oǫ + CH 3 CH3 ) 2ǫ → Zn-O + CH 2 CH3 + CH3 CH

TL;DR: Microwave-hydrothermal synthesis of titanium dioxide under various reaction conditions is reported in this article, where it is found that rutile from TiOCl 2 solutions is found to be extremely rapid.

TL;DR: In this article, Melamine resin microcapsules with long self-life containing fragrant Migrin oil were prepared by in situ polymerization from in situ polymeric polymerization.

TL;DR: In this paper, the effect of changing functional groups of amides and thiosemicarbazone derivatives on their inhibition efficiency has been reported with a view to establishing a relationship between inhibitor efficiency and molecular structure, using the weight loss and hydrogen evolution techniques.

TL;DR: In this article, the electrical, magnetic, and microstructural properties of copper substituted Ni-Zn ferrite powders were studied using XRD, VSM and SEM techniques, which revealed that the bulk density, dc electrical resistivity and initial permeability increased considerably with the optimum copper concentration of x = 0.2.

TL;DR: In this paper, the authors describe the synthesis of a higher cobalt oxide system obtained from a solution technique and show that a Co oxide system may be achieved, in which Co ions are mainly in the highest oxidation state (+4) and in octahedral coordination.

TL;DR: The experimental results on the physical properties such as monolithicity, optical transmission, thermal conductivity and porosity of silica aerogels processed by three different precursors are reported in this paper.

TL;DR: In this article, the authors showed that pH and temperature are the main factors to influence the reaction of NiSO4 with hydrazine at different conditions, and the introduction of nucleator AgNO3 can increase the reaction rate.

TL;DR: In this paper, the degradation of mild steel in 1.0 M sulphuric acid solution by some ethoxylated fatty acids was studied in relation to the concentration of the inhibitors as well as the temperature using chemical (weight loss) and electrochemical polarization techniques.

TL;DR: In this article, the devitrification of polymer-derived SiCN glasses was investigated by scanning electron microscopy and transmission electron microscope (TEM) using NMR spectroscopy.

TL;DR: In this paper, a single phase cubic solid solution Hf1−xEuxO2−x/2 (x = 0.230 and 0.339) with a fluorite lattice was obtained by hydrothermal treatment at 300°C under 10MPa for 3h.

TL;DR: In this paper, the authors studied the dehydration of CaSO4·2H2O and CaSO 4·0.5H 2O in stagnant air by thermo-Raman spectroscopy from 25 to 300°C.

TL;DR: In this paper, a coprecipitation method was applied to prepare rare earth-doped ceria powders with a composition of Ce0.8R0.2O1.9 (R=Sm, La).

TL;DR: In this paper, a method for enabling the transformation of a thin film of wedge-shaped thickness into the spectrum of a uniform film, whose thickness is equal to the average thickness of the non-uniform layer, has been employed.

TL;DR: In this paper, the microstructure, electrical property and gas-sensing characteristics of complex compounds in the CdO-Fe2O3 system have been investigated, and the results from thermal gravimetric-differential thermal analysis and X-ray diffraction measurement indicate that decomposition of CdCO3 takes place from 350 to 500°C, and solid reaction in Cd O 2 O 3 system starts at 570°C; the completion of this reaction is up to 800°C.

TL;DR: Nanocrystalline bismuth sulphide (Bi 2 S 3 ) thin films of various thicknesses having grain size between 7 and 34nm have been prepared by using chemical bath deposition method onto fluorine doped tin oxide (FTO) coated glass substrates (sheet resistance 20-30 ǫ cm 2 ) from an aqueous acidic bath (pH = 5) as discussed by the authors.

TL;DR: In this paper, the basic limitations of novel near net shape techniques are discussed and potential applications are introduced, as well as potential applications of novel biomimetic approaches for near net shapes.

TL;DR: In this article, the effect of Al and Mn contents on the solvus of both inter- and intra-granular κ phase was investigated for a composition range of Fe-(21-32 wt.)Mn-(2-10 wt.%)Al-1C.

TL;DR: In this article, ZnS films were grown onto glass substrates by chemical bath deposition (CBD) technique and X-ray diffraction patterns indicated that the annealed samples are microcrystalline with a sphalerite structure and with a defined peak pattern.

TL;DR: In this article, a chemical coprecipitation route was developed to synthesize a mixed oxalates {BaC2O4+TiO(C 2O4)(H2O)2} precursor.

TL;DR: In this article, hydrogen and carbon NMR spectroscopy was used to investigate the chemical modification process of titanium isopropoxide by acetic acid and showed that the remaining Ti-bound acetate groups maintain an approximate 1/1 ratio, suggesting that oxo-bridge formation occurs through a transesterification process.

TL;DR: In this paper, the authors showed that the nature of the grains, grain boundaries and coupling associated to the superconducting properties were superior in SGR samples, hence sol-gel route appears to be a more suitable method in the preparation of single-phase BSCCO superconductor.

TL;DR: In this article, a hexagonal wurtzite type structure was found in zinc oxide films and the preferential orientation of the film was found to be sensitive to substrate temperature and the lowest value obtained was 3.15 × 10−3 Ωm.

TL;DR: In this paper, a semi-continuous process for BaTiO 3 powders synthesis under high pressure (10 MPa) was reported, where the first step is the hydrolysis of the alkoxide BaTi(O i C 3 H 7 ) 6 in isopropanol at temperatures between 100°C and 200°C in tubular flow reactor.

TL;DR: In this article, the effect of adding rare earth oxide Sm 2 O 3 to the ternary glass was investigated in terms of the number of network bonds of the glass and the average atomic ring size of the network.

TL;DR: In this article, a modified compressometer capable of resolving fractional changes in capacitance of the order of 10 −6 is used to verify the linear relationship between electrostriction coefficient and the ratio of elastic compliance and dielectric permittivity.