| Titre : |
Etudes de l’effet des substitutions et additions de metaux Alkalins sur les proprietes de ceramiques supraconductrices a base de Bismuth. |
| Type de document : |
texte imprimé |
| Auteurs : |
Karima Belala, Auteur ; Abderrezak Amira, Auteur |
| Mention d'édition : |
08/09/2021 |
| Editeur : |
جامعة الإخوة منتوري قسنطينة |
| Année de publication : |
2021 |
| Importance : |
102 f. |
| Format : |
30 cm. |
| Note générale : |
1 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
physique: Sciences des Matériaux phase Bi (Pb)-2212 céramique substitution addition et supraconducteurs Bi(Pb) 2212 phase ceramics Addition and Superconductors إضافة و الموصلات الفائقة السيراميك الاستبدال Bi (Pb) -2212الطور |
| Index. décimale : |
530 Physique |
| Résumé : |
The effect of doping the Bi(Pb)2212 ((Bi,Pb) 2Sr1.8CaCu2O8+d) phase by potassium (K) is investigated. Two kinds of K doped Bi(Pb)2212 samples are used and compared in this study: In the first one K is substituted on the Sr site; In the second one K is added. Using the solid state method reaction, samples of Bi1.5Pb0.5(Sr1.8-xKx)CaCu2O8+d and Bi1.5Pb0.5Sr1.8CaCu2O8+dKx (0 ≤ x≤ 0.05) have been prepared from powders of carbonates and
primary oxides having purity over 99%. The samples have been characterized by X ray diffraction (XRD), scanning electron microscopy (SEM), measurements of resistivity versus temperature and magnetization. Results show how the rate of doping by potassium affects the structural, transport and magnetic properties of Bi(Pb)2212 phase. Substitution of K gives better texture for the used rates while this effect occurs only for lower rate with addition. The temperature of onset of superconductivity Tconset decreases more by addition of K than by
substitution. The two methods improve the critical current density, which reaches a value double by addition comparing to the K free compound.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/BEL7806.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=11638 |
Etudes de l’effet des substitutions et additions de metaux Alkalins sur les proprietes de ceramiques supraconductrices a base de Bismuth. [texte imprimé] / Karima Belala, Auteur ; Abderrezak Amira, Auteur . - 08/09/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 102 f. ; 30 cm. 1 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
physique: Sciences des Matériaux phase Bi (Pb)-2212 céramique substitution addition et supraconducteurs Bi(Pb) 2212 phase ceramics Addition and Superconductors إضافة و الموصلات الفائقة السيراميك الاستبدال Bi (Pb) -2212الطور |
| Index. décimale : |
530 Physique |
| Résumé : |
The effect of doping the Bi(Pb)2212 ((Bi,Pb) 2Sr1.8CaCu2O8+d) phase by potassium (K) is investigated. Two kinds of K doped Bi(Pb)2212 samples are used and compared in this study: In the first one K is substituted on the Sr site; In the second one K is added. Using the solid state method reaction, samples of Bi1.5Pb0.5(Sr1.8-xKx)CaCu2O8+d and Bi1.5Pb0.5Sr1.8CaCu2O8+dKx (0 ≤ x≤ 0.05) have been prepared from powders of carbonates and
primary oxides having purity over 99%. The samples have been characterized by X ray diffraction (XRD), scanning electron microscopy (SEM), measurements of resistivity versus temperature and magnetization. Results show how the rate of doping by potassium affects the structural, transport and magnetic properties of Bi(Pb)2212 phase. Substitution of K gives better texture for the used rates while this effect occurs only for lower rate with addition. The temperature of onset of superconductivity Tconset decreases more by addition of K than by
substitution. The two methods improve the critical current density, which reaches a value double by addition comparing to the K free compound.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/BEL7806.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=11638 |
|
Affiner la recherche Interroger des sources externeseffet du dopage par le sodium sur les propriétés structurales et supraconductrices de composés Bi1.6Pb0.4Sr2CaCu2O (8+Delta) / Karima Belala
