Structural and Magnetic Properties of Dilute Magnetic Oxide Based on Nanostructured Co-Doped Anatase TiO2 (Ti1–x Co x O2−δ)
Nanostructured Co-doped anatase TiO2 (Ti1–x Co x O2−δ) samples were prepared and studied with particular emphasis on their compositional, structural, and magnetic properties. A detailed microstructural analysis was carried out to investigate the nature of the Co incorporation into the anatase TiO2 m...
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| Veröffentlicht in: | Journal of physical chemistry. C 2013-06, Vol.117 (25), p.13252-13260 |
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| container_title | Journal of physical chemistry. C |
| container_volume | 117 |
| creator | de Souza, Talita E Mesquita, Alexandre de Zevallos, Angela O Béron, Fanny Pirota, Kleber R Neves, Person P Doriguetto, Antonio C de Carvalho, Hugo B |
| description | Nanostructured Co-doped anatase TiO2 (Ti1–x Co x O2−δ) samples were prepared and studied with particular emphasis on their compositional, structural, and magnetic properties. A detailed microstructural analysis was carried out to investigate the nature of the Co incorporation into the anatase TiO2 matrix. By combining different techniques, we confirmed the replacement of Ti4+ by Co2+ ions in the anatase TiO2 structure. Neither segregated secondary phases nor Co-rich nanocrystals were detected. Co doping was found to introduce oxygen vacancies into the system by means of a charge-compensation process. Superconducting quantum interference device magnetometry demonstrated paramagnetic Curie–Weiss behavior with antiferromagnetic interactions even in the presence of a high density of oxygen vacancies. The fitting of the M(H) curves in the limits of low and high temperatures enable the fractions of isolated and antiferromagnetically coupled Co ions to be extracted. We discuss the observed magnetic behavior of our samples considering the current main theories for the magnetic properties of dilute magnetic oxides. |
| doi_str_mv | 10.1021/jp4017129 |
| format | Article |
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A detailed microstructural analysis was carried out to investigate the nature of the Co incorporation into the anatase TiO2 matrix. By combining different techniques, we confirmed the replacement of Ti4+ by Co2+ ions in the anatase TiO2 structure. Neither segregated secondary phases nor Co-rich nanocrystals were detected. Co doping was found to introduce oxygen vacancies into the system by means of a charge-compensation process. Superconducting quantum interference device magnetometry demonstrated paramagnetic Curie–Weiss behavior with antiferromagnetic interactions even in the presence of a high density of oxygen vacancies. The fitting of the M(H) curves in the limits of low and high temperatures enable the fractions of isolated and antiferromagnetically coupled Co ions to be extracted. We discuss the observed magnetic behavior of our samples considering the current main theories for the magnetic properties of dilute magnetic oxides.</description><identifier>ISSN: 1932-7447</identifier><identifier>EISSN: 1932-7455</identifier><identifier>DOI: 10.1021/jp4017129</identifier><language>eng</language><publisher>Columbus, OH: American Chemical Society</publisher><subject>Applied sciences ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Cross-disciplinary physics: materials science; rheology ; Electronics ; Exact sciences and technology ; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties ; Magnetic properties and materials ; Magnetic properties of nanostructures ; Materials science ; Molecular electronics, nanoelectronics ; Nanocrystalline materials ; Nanoscale materials and structures: fabrication and characterization ; Physics ; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</subject><ispartof>Journal of physical chemistry. 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C</title><addtitle>J. Phys. Chem. C</addtitle><description>Nanostructured Co-doped anatase TiO2 (Ti1–x Co x O2−δ) samples were prepared and studied with particular emphasis on their compositional, structural, and magnetic properties. A detailed microstructural analysis was carried out to investigate the nature of the Co incorporation into the anatase TiO2 matrix. By combining different techniques, we confirmed the replacement of Ti4+ by Co2+ ions in the anatase TiO2 structure. Neither segregated secondary phases nor Co-rich nanocrystals were detected. Co doping was found to introduce oxygen vacancies into the system by means of a charge-compensation process. Superconducting quantum interference device magnetometry demonstrated paramagnetic Curie–Weiss behavior with antiferromagnetic interactions even in the presence of a high density of oxygen vacancies. The fitting of the M(H) curves in the limits of low and high temperatures enable the fractions of isolated and antiferromagnetically coupled Co ions to be extracted. We discuss the observed magnetic behavior of our samples considering the current main theories for the magnetic properties of dilute magnetic oxides.</description><subject>Applied sciences</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Electronics</subject><subject>Exact sciences and technology</subject><subject>Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties</subject><subject>Magnetic properties and materials</subject><subject>Magnetic properties of nanostructures</subject><subject>Materials science</subject><subject>Molecular electronics, nanoelectronics</subject><subject>Nanocrystalline materials</subject><subject>Nanoscale materials and structures: fabrication and characterization</subject><subject>Physics</subject><subject>Semiconductor electronics. Microelectronics. Optoelectronics. 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Microelectronics. Optoelectronics. Solid state devices</topic><topic>Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>de Souza, Talita E</creatorcontrib><creatorcontrib>Mesquita, Alexandre</creatorcontrib><creatorcontrib>de Zevallos, Angela O</creatorcontrib><creatorcontrib>Béron, Fanny</creatorcontrib><creatorcontrib>Pirota, Kleber R</creatorcontrib><creatorcontrib>Neves, Person P</creatorcontrib><creatorcontrib>Doriguetto, Antonio C</creatorcontrib><creatorcontrib>de Carvalho, Hugo B</creatorcontrib><collection>Pascal-Francis</collection><jtitle>Journal of physical chemistry. C</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>de Souza, Talita E</au><au>Mesquita, Alexandre</au><au>de Zevallos, Angela O</au><au>Béron, Fanny</au><au>Pirota, Kleber R</au><au>Neves, Person P</au><au>Doriguetto, Antonio C</au><au>de Carvalho, Hugo B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structural and Magnetic Properties of Dilute Magnetic Oxide Based on Nanostructured Co-Doped Anatase TiO2 (Ti1–x Co x O2−δ)</atitle><jtitle>Journal of physical chemistry. C</jtitle><addtitle>J. Phys. Chem. C</addtitle><date>2013-06-27</date><risdate>2013</risdate><volume>117</volume><issue>25</issue><spage>13252</spage><epage>13260</epage><pages>13252-13260</pages><issn>1932-7447</issn><eissn>1932-7455</eissn><abstract>Nanostructured Co-doped anatase TiO2 (Ti1–x Co x O2−δ) samples were prepared and studied with particular emphasis on their compositional, structural, and magnetic properties. A detailed microstructural analysis was carried out to investigate the nature of the Co incorporation into the anatase TiO2 matrix. By combining different techniques, we confirmed the replacement of Ti4+ by Co2+ ions in the anatase TiO2 structure. Neither segregated secondary phases nor Co-rich nanocrystals were detected. Co doping was found to introduce oxygen vacancies into the system by means of a charge-compensation process. Superconducting quantum interference device magnetometry demonstrated paramagnetic Curie–Weiss behavior with antiferromagnetic interactions even in the presence of a high density of oxygen vacancies. The fitting of the M(H) curves in the limits of low and high temperatures enable the fractions of isolated and antiferromagnetically coupled Co ions to be extracted. We discuss the observed magnetic behavior of our samples considering the current main theories for the magnetic properties of dilute magnetic oxides.</abstract><cop>Columbus, OH</cop><pub>American Chemical Society</pub><doi>10.1021/jp4017129</doi><tpages>9</tpages></addata></record> |
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| subjects | Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Electronics Exact sciences and technology Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Magnetic properties and materials Magnetic properties of nanostructures Materials science Molecular electronics, nanoelectronics Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Physics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) |
| title | Structural and Magnetic Properties of Dilute Magnetic Oxide Based on Nanostructured Co-Doped Anatase TiO2 (Ti1–x Co x O2−δ) |
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