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6 results on '"Gaudon M"'

1. Green coloration of Co-doped ZnO explained from structural refinement and bond considerations

Author

Gaudon, M., Toulemonde, O., and Demourgues, A.

Subjects
Zinc oxide -- Research, Zinc oxide -- Chemical properties, Coordination compounds -- Research, Coordination compounds -- Chemical properties, Coordination compounds -- Properties, Chemistry
Abstract

ZnO doped with [Co.sup.2} is prepared by a Pechini process and is examined in terms of ultraviolet visible properties and crystallographic structures. The anticipative method of the structure relaxations is discussed from exchanged effective charge per bond calculated with the purely ionic Brown and Altermatt model.

Published
2007

2. Steric and electronic effects relating to the [Cu.sup.2+] Jahn-Teller distortion in [Zn.sub.1-x][Cu.sub.x][Al.sub.2][O.sub.4] spinels

Author

Le Nestour, A., Gaudon, M., Villeneuve, G., Andriessen, R., and Demourgues, A.

Subjects
Copper compounds -- Chemical properties, Copper compounds -- Structure, Zinc compounds -- Structure, Zinc compounds -- Chemical properties, Aluminum oxide -- Structure, Aluminum oxide -- Chemical properties, Chemistry
Abstract

The structural investigation of [Zn.sub.1-x][Cu.sub.x][Al.sub.2][O.sub.4] spinels was carried out and effects relating to the [Cu.sup.2+] Jahn-Teller distortion were studied. It was seen that the position and the intensity of the various absorption bands were influenced by the distribution of [Cu.sup.2+] in tetrahedral and octahedral sites and the increasing of Cu-O bond covalency.

Published
2007

3. Synthesis temperature effect on the structural features and optical absorption of [Zn.sub.1-x][Co.sub.x][Al.sub.2][O.sub.4] oxides

Author

Gaudon, M., Apheceixborde, A., Menetrier, M., Le Nestour, A., and Demourgues, A.

Subjects
Aluminum oxide -- Chemical properties, Aluminum oxide -- Spectra, Infrared spectroscopy -- Usage, Oxidation-reduction reaction -- Analysis, Scanning microscopy -- Usage, Zinc oxide -- Chemical properties, Zinc oxide -- Spectra, X-rays -- Diffraction, X-rays -- Usage, Chemistry
Published
2009

5. Characterization of the piezochromic behavior of some membranes of the Cu[Mo.sub.1-x][W.sub.x][O.sub.4] series

Author

Gaudon, M., Thiry, A.E., Largeteau, A., Deniard, P., Jobic, S., Majimel, J., and Demourgues, A.

Subjects
Copper compounds -- Structure, Copper compounds -- Chemical properties, Tungsten -- Chemical properties, Oxidation-reduction reaction -- Analysis, Chemistry
Abstract

The influence of the tungsten rate and the thermal/pressure history of the samples of Cu[Mo.sub.1-x][W.sub.x][O.sub.4] series (x

Published
2008

6. Adaptable thermochromism in the Cu[Mo.sub.1-x][W.sub.x][O.sub.4] series (0(less than or equal to)X<0.1): a behavior related to a first-order phase transition with a transition temperature depending on X

Author

Gaudon, M., Carbonera, C., Thiery, A.E., Demourgues, A., Deniard, P., Payen, C., Letard, J.-F., and Jobic, S.

Subjects
Tungsten -- Chemical properties, Substitution reactions -- Research, Calorimetry -- Technology application, Magnetism -- Research, Thermochromism -- Research, Technology application, Chemistry
Abstract

Calorimetry, reflectivity and magnetism techniques were used for analyzing the transition temperature modifications with tungsten substitution. Findings reveal a significant increase in the temperature transition in a parallel way for the heating and cooling mode on substitution of molybdenum for tungsten.

Published
2007

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