{"id":10634,"date":"2022-02-03T14:24:00","date_gmt":"2022-02-03T13:24:00","guid":{"rendered":"https:\/\/www.ummto.dz\/fs\/?p=10634"},"modified":"2022-02-06T14:05:48","modified_gmt":"2022-02-06T13:05:48","slug":"avis-de-soutenance-chenna-ali","status":"publish","type":"post","link":"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-chenna-ali\/","title":{"rendered":"Avis de Soutenance de Doctorat en Sciences de Monsieur CHENNA Ali"},"content":{"rendered":"\n\n[et_pb_section fb_built=\u00a0\u00bb1″ _builder_version=\u00a0\u00bb4.14.7″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb custom_margin=\u00a0\u00bb0px|0px|0px|0px|false|false\u00a0\u00bb custom_padding=\u00a0\u00bb0px|0px|0px|0px|false|false\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.14.7″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb100%\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb4.14.7″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.14.7″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb99%\u00a0\u00bb hover_enabled=\u00a0\u00bb0″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]

M.CHENNA Ali<\/strong><\/span><\/p>\n

Soutiendra sa th\u00e8se de Doctorat Es Sciences en Chimie <\/span>Specialite : Electro Chimie.<\/p>\n

Intitul\u00e9e:\u00a0\u00ab<\/strong>Elaboration \u00e9lectrochimique d\u2019alliage Fe Ni sur un substrat en silicium. <\/strong><\/span>\u00bb<\/strong><\/span><\/p>\n

Le\u00a0: 09 F\u00e9vrier 2022<\/span><\/strong> \u00e0 Salle visio conf\u00e9rences du Centre des Syst\u00e8mes et R\u00e9seaux de l\u2019UMMTO<\/span><\/strong> \u00e0 10h00<\/span><\/strong><\/span><\/p>\n

\u00a0\u00a0<\/span><\/p>\n

Directrice de Th\u00e8se\u00a0: Professeure BENBRAHIM Nassima<\/strong><\/span><\/p>\n

Devant le jury d\u2019examen suivant<\/u><\/strong>\u00a0:<\/u><\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n
M.MECHOUET\u00a0\u00a0 Mourad<\/strong><\/span><\/td>\nMa\u00eetre de Conf\u00e9rences (A)<\/strong><\/span><\/td>\nUMMTO<\/strong><\/span><\/td>\nPr\u00e9sident<\/strong><\/span><\/td>\n<\/tr>\n
Mme. BENBRAHIM\u00a0 Nassima<\/strong><\/span><\/td>\nProfesseure<\/strong><\/span><\/td>\nUMMTO<\/strong><\/span><\/td>\n\u00a0Directrice de th\u00e8se <\/strong><\/span><\/td>\n<\/tr>\n
M. CHAINET\u00a0\u00a0\u00a0\u00a0\u00a0 Eric<\/strong><\/span><\/td>\nDirecteur de Recherche<\/strong><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/span><\/td>\nLEPMI\/Grenoble<\/strong><\/span><\/td>\nCo-directeur<\/strong><\/span><\/td>\n<\/tr>\n
Mme. DOKHAN\u00a0\u00a0 Nahed<\/strong><\/span><\/td>\nMa\u00eetre de Conf\u00e9rences (A)<\/strong><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/span><\/td>\nUMB<\/strong><\/span><\/td>\nExaminatrice<\/strong><\/span><\/td>\n<\/tr>\n
M. GUITTOUM\u00a0 Abderrahim \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/strong><\/span><\/td>\nMa\u00eetre de Recherche<\/strong><\/span><\/td>\nCRNA\/ALGER<\/strong><\/span><\/td>\nExaminateur<\/strong><\/span><\/td>\n<\/tr>\n
Mme. MELLIL\u00a0\u00a0\u00a0 Baya<\/strong><\/span><\/td>\nMa\u00eetre de Conf\u00e9rences(A)<\/strong><\/span><\/strong><\/span><\/strong><\/span><\/strong><\/span><\/td>\nUMMTO<\/strong><\/span><\/td>\nExaminatrice<\/strong><\/span><\/strong><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/strong><\/span><\/p>\n

<\/strong><\/span><\/p>\n

R\u00e9sum\u00e9:<\/strong><\/span><\/p>\n

Ce travail porte sur l\u2019\u00e9lectrod\u00e9position d\u2019un alliage FeNi, directement sur un substrat de silicium n-Si(111)-H , \u00e0 partir d\u2019un bain sulfate tr\u00e8s dilu\u00e9,. Dans un premier lieu, les propri\u00e9t\u00e9s \u00e9lectroniques de l\u2019interface n-Si(111)-H\/\u00e9lectrolyte ont \u00e9t\u00e9 \u00e9tudi\u00e9es par spectroscopie d\u2019imp\u00e9dance \u00e9lectrochimique (SIE) en pr\u00e9sence et en absence de la saccharine (SAC). Par la suite, la cin\u00e9tique d\u2019\u00e9lectrod\u00e9position de l\u2019alliage FeNi a \u00e9t\u00e9 \u00e9tudi\u00e9e par la voltam\u00e9trie cyclique, ainsi que la composition des d\u00e9p\u00f4ts en fonction de la concentration en ions Fe2+<\/sup>. La composition moyenne de Fe55<\/sub>Ni45<\/sub> a \u00e9t\u00e9 obtenue, en mode galvanostatique (densit\u00e9 de courant 0.06mA.cm-2<\/sup>), pour une concentration ionique en Fe2+<\/sup> dans la gamme [0.03-0.035] M et une concentration en Ni2+<\/sup> de 0.06M. Les propri\u00e9t\u00e9s \u00e9lectroniques et de corrosion des d\u00e9p\u00f4ts FeNi ont \u00e9galement \u00e9t\u00e9 \u00e9tudi\u00e9es, en fonction de la teneur en fer par SIE. Les observations par microscopie \u00e9lectronique \u00e0 balayage (MEB) ont montr\u00e9 que la morphologie des d\u00e9p\u00f4ts d\u00e9pend fortement de la concentration en fer\u00a0; les d\u00e9p\u00f4ts les plus lisses sont obtenus pour la composition Fe55<\/sub>Ni45<\/sub>. L\u2019analyse DRX a r\u00e9v\u00e9l\u00e9 que ces films sont constitu\u00e9s d\u2019une mixture de la phase fcc et bcc avec de tr\u00e8s petites tailles de grains de 10 nm en moyenne. Les mesures magn\u00e9tiques par VSM ont r\u00e9v\u00e9l\u00e9 une coercivit\u00e9 inf\u00e9rieure \u00e0 1.3 Oe pour des d\u00e9p\u00f4ts Fe55<\/sub>Ni45<\/sub> de 640 nm d\u2019\u00e9paisseur. Ces propri\u00e9t\u00e9s magn\u00e9tiques ultra douces sont une signature du faible taux de d\u00e9fauts dans les d\u00e9p\u00f4ts.<\/span><\/p>\n

Mots cl\u00e9s :<\/em><\/strong><\/span>Electrod\u00e9position<\/em>,<\/em>FeNi,Substrat Si(111), Propri\u00e9t\u00e9s structurales, Propri\u00e9t\u00e9s magn\u00e9tiques.<\/em><\/span><\/p>\n

<\/em><\/p>\n

Abstract<\/strong><\/span><\/p>\n

Electrodeposition of FeNi films, directly onto Hydrogen terminated n-Si(111)-H from acidic dilute sulfate solution, was studied by electrochemical measurements at room temperature. First of all, we have investigated the electronic properties of the hydrogen terminated Si(111) (n-Si(111)-H)\/electrolyte interface using Electrochemical impedance spectroscopy (EIS) in the presence and absence of saccharin (SAC). Afterwards, the kinetics of the electroplating process was investigated by voltammetric study and the effect of Fe2+<\/sup> concentration on the deposit composition was studied. The average composition of Fe55<\/sub>Ni45 <\/sub>film was obtained for Fe2+<\/sup> concentration in the range [0.030-0.035] mol.L-1 <\/sup>at a current density of -6 mA.cm-2<\/sup>. Correlation between Fe2+<\/sup> concentration in the FeNi deposit and electronic properties was also examined by electrochemical impedance spectroscopy (EIS). As observed by SEM analysis, film roughness depends on Fe2+<\/sup> concentration, a smoother deposit was obtained for Fe55<\/sub>Ni45 <\/sub>film. The film consisted of a mixture of fcc\/bcc phase with a little grain size of 10 nm. Very low coercivity (less than 1.3Oe) was measured in Fe55<\/sub>Ni45 <\/sub>thin film with a nominal thickness of 640 nm. The very soft magnetic properties of the FeNi films provide information about the low level of inhomogeneities present in these films.<\/span><\/p>\n

Keywords\u00a0:<\/em><\/strong><\/span>Electrodeposition, FeNi, Si(111) Substrat, Structural <\/em>properties<\/em>, <\/em>Magnetic properties.<\/em><\/span><\/p>\n

\u00a0<\/strong><\/span><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n\n","protected":false},"excerpt":{"rendered":"

M.CHENNA Ali Soutiendra sa th\u00e8se de Doctorat Es Sciences en Chimie Specialite : Electro Chimie. Intitul\u00e9e:\u00a0\u00abElaboration \u00e9lectrochimique d\u2019alliage Fe Ni sur un substrat en silicium. \u00bb Le\u00a0: 09 F\u00e9vrier 2022 \u00e0 Salle visio conf\u00e9rences du Centre des Syst\u00e8mes et R\u00e9seaux de l\u2019UMMTO \u00e0 10h00 \u00a0\u00a0 Directrice de Th\u00e8se\u00a0: Professeure BENBRAHIM Nassima Devant le jury d\u2019examen […]<\/p>\n","protected":false},"author":13,"featured_media":6032,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-10634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe"],"yoast_head":"\nAvis de Soutenance de Doctorat en Sciences de Monsieur CHENNA Ali -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-chenna-ali\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Avis de Soutenance de Doctorat en Sciences de Monsieur CHENNA Ali -\" \/>\n<meta property=\"og:description\" content=\"M.CHENNA Ali Soutiendra sa th\u00e8se de Doctorat Es Sciences en Chimie Specialite : Electro Chimie. 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