| Electrostatic Force Microscopy, Principles and Applications to Semiconductor Materials and Devices |
JUN 2001 |
3 pages |
| Authors:
Paul Girard; MONTPELLIER-2 UNIV (FRANCE)
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 | We have shown the principles on which is based the Electrostatic Force Microscopy and the expected peffomances. Basing on experimental data we have seen how to interpret the contrasts observed in the experiments. Then we have shown typical observations on semiconductors. We can say that the EFM is now an established method to explore local properties of semiconductor materials structures and devices but the field can be widened by new ... |
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| Excitons in Nitride-Based Low Dimensional Systems |
JUN 2001 |
2 pages |
| Authors:
Bernard Gil; MONTPELLIER-2 UNIV (FRANCE)
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| The exciton binding energy is large (25-27 meV) in bulk GaN. The coupling with the electromagnetic is large too. Together with a collegue I predicted a Rabbi oscillation splitting of some 45 meV in GaN based microcavities. |
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| One-Step Route to Silicon Carbide Precursors by a Tunable Catalytic Polycondensation. |
1994 |
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| Authors:
Robert J. P. Corriu; Markus Enders; Sylvain Huille; Joel J. E. Moreau; MONTPELLIER-2 UNIV (FRANCE)
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 | We wish to report here that 1,4-disilapentane (1, H3-SiCH2CH2SiH2Me), a highly functionalized carbosilane monomer, can directly serve as a ceramic precursor. The titanium-catalyzed dehydropolymerization gives rise to preceramic oligomers and polymers with a tunable degree of condensation. Whatever the molecular weight of the ceramic precursor, pyrolysis in the presence of titanium catalyst gives high yields of silicon carbide residue. |
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| Toughness and Fracture Surface Energy of Wet SiO2-SiO2 Sonogel Composites. |
1994 |
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| Authors:
J. Zarzycki; M. Atik; MONTPELLIER-2 UNIV (FRANCE)
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| A knowledge of the parameters which govern crack propagation namely, critical stress intensity factor K(ic), and fracture surface energy gamma, is essential to the understanding of the mechanical behavior of solid materials. In the case of wet SiO2 gels, these parameters have only seldom been measured due to great experimental difficulties. The modulus of rupture (MOR) of SiO2 wet gels was measured by other authors but no determinations of K(ic) ... |
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| Properties of ZrO2 and HfO2 Films Obtained by Reactive Thermal Evaporation. |
1993 |
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| Authors:
F. Tcheliebou; A. Boyer; J. P. Cheron; MONTPELLIER-2 UNIV (FRANCE)
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| Zirconia (ZrO2) and hafnia (HfO2) were obtained by reactive thermal evaporation with a high deposition rate. Films physical properties were investigated. The layers were deposited onto nickel and also onto NiCoCrAlY-nickel substrates. It was found that this plug layer enhances both oxide adherence and its dielectrical properties, yielding interesting electrical insulation. Elsewhere, X-rays patterns displayed polycrystalline structure. These ceramics were applied in thermal sensors and could be used as corrosion-resistant ... |
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| Sonogels in the Preparation of Advanced Glass and Ceramic Materials |
20 OCT 92 |
117 pages |
| Authors:
J. Zarzycki; MONTPELLIER-2 UNIV (FRANCE)
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| Ultrasonic irradiation of mixtures of alkoxides and water (the sonocatalytic method) was shown to provide an interesting way of preparing matrices for ceramic-ceramic composites. The gelation speed of the sonogels can be sufficiently controlled to avoid the segregation of short Al2O3 or ZrO2 fibres used as fillers. High homogeneity dispersions were produced in this way and the density of samples increased. In the case of cordierite, 5 SiO2, Al2O3, 2MgO ... |
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| Obtention of CdSex S1-x precipitates in Sol-Gel Matrices, |
MAR 1992 |
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| Authors:
Carol M. Bagnall; Jerzy Zarzychi; MONTPELLIER-2 UNIV (FRANCE)
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| Various methods of obtaining fine colloidal precipitates of cadmium sulfo-selenides in SiO2 gel matrices are described. These materials, which are of interest in optoelectronic applications, can be prepared by diffusion of various reactants in wet gels. The influence of different preparative parameters on the diffusion characteristics the possibility of obtaining distribution gradients and, in particular, the interest of sonocatalysis (ultrasonic irradiation) are briefly presented. |
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| Advanced Research Workshop on Wide Gap II-VI Semiconductors Held in Montpellier, France on 16-18 January 1991 |
18 JAN 91 |
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| Authors:
MONTPELLIER-2 UNIV (FRANCE)
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| Invited Lectures: Physics of Wide-gap II-VI Heterostructures ans Super-lattices, Growth of ZnSe Layers by MBE, Epitaxial Growth of ZnSe for Bulk Emission - Current Research in Japan-, The Growth of Bulk ZnSe Crystals for epitaxial Substrates, p-type ZnSe and Blue LEDs, Theoretical Study of Electron Transport in ZnSe: Application to Material Quality Assessment, The Growth of ZnSe and Other Wide-bandgap II-VI Semiconductors by MOCVD, New Precursors for Wide-gap II-VI Semiconductors, ... |
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| Thermal Stabilization of Aluminium Titanate and Properties of Aluminium Titanate Solid Solutions |
91 |
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| Authors:
G. Tilloca; MONTPELLIER-2 UNIV (FRANCE)
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| Aluminum titanate has a near zero thermal expansion coefficient (alpha=0.000008/C) in the range 20 to 1000 C, nevertheless it decomposes below 1200 C. The thermal stabilization of Al2TiO5 without altering its thermal expansion has been considered by partial substitution in the structure compound of Al(3+) ions by Fe(3+) ions. The solid solutions prepared by solid state reaction are in agreement with the general formula Al(1-x)2Fe(2x)TiO5 (0 |
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| Structural Evolution of a Gel of the SiO2-PbO-K2O System |
91 |
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| Authors:
H. Nussbaum; J. Zarzycki; MONTPELLIER-2 UNIV (FRANCE)
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| Sol-Gel Preparation and Transport Properties of a Tin Oxide |
90 |
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| Authors:
J. C. Giuntini; W. Granier; J. V. Zanchetta; A. Taha; MONTPELLIER-2 UNIV (FRANCE)
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| Much work has been carried out concerning the preparation and study of tin (IV) oxide, alone and combined with other oxides, for application related to electrical and catalytic properties. It has been noticed that the properties related to this oxide depend on the texture of the material. For this reason the sol-gel procedure was used to prepare such a compound. Study of these gels has shown that there is a ... |
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| Off-Normal-Incidence Effects in the Infrared-Reflectivity Spectra of Aluminum Phosphate |
89 |
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| Authors:
A. Goullet; J. Camassel; L. Martin; J. Pascual; E. Philippot; MONTPELLIER-2 UNIV (FRANCE)
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| The polarized-reflectivity spectra of aluminum phosphate has been investigated in great detail with respect to the effects of finite off-normal- incidence angle. An unambiguous identification of the extra structure, which manifests itself at 525 /cm in the gamma2(p) or transverse-magnetic (TM) configuration, has been made. It comes from a strong gamma3 mode, of which the LO component couples to the light for nonzero values of the angle of incidence. This ... |
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| European Solid State Device Research Conference (18th) ESSDERC 88 Held In Montpellier, France on 13-16 September 1988 |
16 SEP 88 |
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| Authors:
J. P. Nougier; D. Gasquet; MONTPELLIER-2 UNIV (FRANCE)
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| Correlation of Lethal Concentrations of Heavy Metals with Tissue Levels of Earthworms |
AUG 88 |
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| Authors:
J. Y. Gal; Marcel B. Bouche; MONTPELLIER-2 UNIV (FRANCE)
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| The objectives of this research are: To establish the LC50 of the heavy metals cadmium, copper, arsenic and mercury as well as a Cu/Cd mixture in a ratio equal to LC50 Cd/LC50 Cu, employing a chemically defined medium such as 'Aristol'; To improve procedures for heavy metal bioavailability studies in the field; To improve/develop test procedures using a chemically defined medium and 'food' in 28-day uptake studies; To analyze the ... |
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| Lethal Concentrations of Heavy Metals in Tissue of Earthworms |
OCT 87 |
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| Authors:
Marcel B. Bouche; Patrick Brun; J. Y. Gal; Abdul Rida; MONTPELLIER-2 UNIV (FRANCE)
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| This toxicological research report addresses lethal concentrations of heavy metals in tissue of earthworms. We have presented the work in progress in the first interim report to improve 1) ecotoxicological test, 2) field procedures and 3) standardization of analysis. This second interim report deals mostly with toxicity tests because the point (3) is now in order and the work in field was impossible during the last dry season. Nevertheless, analysis ... |
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| Lethal Concentrations of Heavy Metals in Tissue Earthworms |
JUL 87 |
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| Authors:
Marcel B. Bouche; Patrick Brun; J. Y. Gal; A. Reza; MONTPELLIER-2 UNIV (FRANCE)
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| The objective of this phase of Toxicological research on Lethal Concentrations of Heavy Metals in Tissue of Earthworms is to improve both ecotoxicological test in a chemically defined medium and a procedure of bioavailability study in field. In this first period we worked on breeding stock of earthworms (species Eisenia fetida andrei) in decomposing manure heaps to increase them and make them grow. We also installed two chambers with thermostats ... |
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