| Titre : |
Etude de l'influence des éléments ferromagnétiques sur les propriétés physiques des couches minces de Ti02 |
| Type de document : |
texte imprimé |
| Auteurs : |
Badreddine Toubal, Auteur ; Rabah Bensaha, Directeur de thèse |
| Editeur : |
جامعة الإخوة منتوري قسنطينة |
| Année de publication : |
2017 |
| Importance : |
136 f. |
| Format : |
30 cm. |
| Note générale : |
2 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Sol-Gel Couches Minces xerogels de TiCE dopage Co, Ni, Cu anatase rutile CoTiOj ferromagnétisme Conductivité (a) résistivité (p) électrique سائل-جامد الشرائح الرقيقة xerogels TI02 التطعيم النيكل الكوبالت والنحاس الناقلية الكهربائية (σ)و المقاومة الكهربائية (ρ) |
| Index. décimale : |
530 Physique |
| Résumé : |
We investigated the influence of ferromagnetic elements on the physical properties of the thin layers of Ti02 obtained by the Sol-gel method. In this study we have prepared a series of mono and co-doped samples respectively. 7a/%.Co,. 7a/%Ni, 3.5%.or (Cu-Co) and 3.5%.at (Cu-Ni) treated at different annealing temperatures.
The thermal analysis by (ATG) and differential Calorimetry (DSC) of Xerogels show that Ti02 crystallization occurs at low temperatures. Whereas, X-ray diffraction and Raman spectroscopy of thin layers ofTi02 mono and co-doped treated at 450°C for lh, highlight only the presence of the anatase phase.
SEM images of non-doped and mono-doped Ti02 thin films, respectively7a/%.Co,. 7a/%Ni. Nor have a similarity in their morphology. While, those doped co have a completely different morphology with the appearance of agglomerates of nanoparticles of anatase. We can also see that the transmission spectra of the thin layers of non-doped Ti02, mono-doped at laf/o.Co,.
7a/%Ni, and co-doped 3.5%.at (Cu-Co) and 3.5%.ar (Cu-Ni) are transparent in the visible and opaque in UV.
However, the presence of oxygen deficiencies and the probable formation of metal clusters are probably the two different sources, which contribute to the ferromagnetism found in nondoped Ti02 thin layers and codoped respectively at 3,5%. at (CU-CO) and 3,5%. At. (co-NI).
On the other hand, for thin layers of Ti02 mono and co-doped respectively at 7%. at Co and 3,5%. at (Cu-CO) annealed at 800 0 C, the crystalline structure is a mixture of phases:
anatase, rutile and cobalt from Titanate CoTi03. However, the films annealed at 1000 ° C exhibited the existence of two phases: the CoTi03 ilmenite and the rutile.
The reflection spectra of the thin layers of Ti02 co-doped (CU-CO) move to the large wavelengths, by contribution to those of the 7% mono-doped thin films at Co and non-doped, treated at the two annealing temperatures 800 ° C and 1000 ° C. Whereas, the electrical tests at ambient temperature of the thin films treated at 800 ° C and 1000 ° C show similar behaviour representing a specific nature.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/TOU7143.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=10459 |
Etude de l'influence des éléments ferromagnétiques sur les propriétés physiques des couches minces de Ti02 [texte imprimé] / Badreddine Toubal, Auteur ; Rabah Bensaha, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 136 f. ; 30 cm. 2 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Sol-Gel Couches Minces xerogels de TiCE dopage Co, Ni, Cu anatase rutile CoTiOj ferromagnétisme Conductivité (a) résistivité (p) électrique سائل-جامد الشرائح الرقيقة xerogels TI02 التطعيم النيكل الكوبالت والنحاس الناقلية الكهربائية (σ)و المقاومة الكهربائية (ρ) |
| Index. décimale : |
530 Physique |
| Résumé : |
We investigated the influence of ferromagnetic elements on the physical properties of the thin layers of Ti02 obtained by the Sol-gel method. In this study we have prepared a series of mono and co-doped samples respectively. 7a/%.Co,. 7a/%Ni, 3.5%.or (Cu-Co) and 3.5%.at (Cu-Ni) treated at different annealing temperatures.
The thermal analysis by (ATG) and differential Calorimetry (DSC) of Xerogels show that Ti02 crystallization occurs at low temperatures. Whereas, X-ray diffraction and Raman spectroscopy of thin layers ofTi02 mono and co-doped treated at 450°C for lh, highlight only the presence of the anatase phase.
SEM images of non-doped and mono-doped Ti02 thin films, respectively7a/%.Co,. 7a/%Ni. Nor have a similarity in their morphology. While, those doped co have a completely different morphology with the appearance of agglomerates of nanoparticles of anatase. We can also see that the transmission spectra of the thin layers of non-doped Ti02, mono-doped at laf/o.Co,.
7a/%Ni, and co-doped 3.5%.at (Cu-Co) and 3.5%.ar (Cu-Ni) are transparent in the visible and opaque in UV.
However, the presence of oxygen deficiencies and the probable formation of metal clusters are probably the two different sources, which contribute to the ferromagnetism found in nondoped Ti02 thin layers and codoped respectively at 3,5%. at (CU-CO) and 3,5%. At. (co-NI).
On the other hand, for thin layers of Ti02 mono and co-doped respectively at 7%. at Co and 3,5%. at (Cu-CO) annealed at 800 0 C, the crystalline structure is a mixture of phases:
anatase, rutile and cobalt from Titanate CoTi03. However, the films annealed at 1000 ° C exhibited the existence of two phases: the CoTi03 ilmenite and the rutile.
The reflection spectra of the thin layers of Ti02 co-doped (CU-CO) move to the large wavelengths, by contribution to those of the 7% mono-doped thin films at Co and non-doped, treated at the two annealing temperatures 800 ° C and 1000 ° C. Whereas, the electrical tests at ambient temperature of the thin films treated at 800 ° C and 1000 ° C show similar behaviour representing a specific nature.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/TOU7143.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=10459 |
|
Affiner la recherche Interroger des sources externesEtude de l'influence de la concentration du cobalt sur les propriétés physico-chimiques des couches minces de TiO2 , obtenues par voie sol-gel / Badreddine Toubal
