{"title":"新型Mo-Co混合铁氧体的制备与物理化学表征","authors":"Sylvie Douard, Philippe Tailhades, Abel Rousset","doi":"10.1016/S1251-8069(97)82340-8","DOIUrl":null,"url":null,"abstract":"<div><p>New Mo<sub><em>x</em></sub>Co<sub><em>y</em></sub>Fe<sub>3 − <em>x</em> − <em>y</em></sub>O<sub>4</sub> ferrites have been prepared from hydroxide precursors leading to fine spherical particles. The so-obtained products have quite high substitution rates (x ≈ 0.5 and 0 ⩽ y ⩽ 1), higher than those ever reported for <em>Mo-Co</em> ferrites. The substitution of Fe<sup>2+</sup> ions by Co<sup>2+</sup> ions, which have a stronger magnetocrystalline anisotropy, and the directional order phenomenon both involve an enhancement in coercivity. Nevertheless, because of differences in composition, in cationic distribution and in particle morphology, the <em>Mo-Co</em> ferrites synthesized according to our process show a coercive force lower than that observed by other workers. The cobalt element stabilizes the spinel structure of the ferrites by decreasing their reactivity towards oxygen. Besides, for high cobalt content, a proportion of these ions has the valency state + III.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 12","pages":"Pages 739-747"},"PeriodicalIF":0.0000,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)82340-8","citationCount":"2","resultStr":"{\"title\":\"Élaboration et caractérisation physico-chimique de nouveaux ferrites mixtes Mo-Co\",\"authors\":\"Sylvie Douard, Philippe Tailhades, Abel Rousset\",\"doi\":\"10.1016/S1251-8069(97)82340-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>New Mo<sub><em>x</em></sub>Co<sub><em>y</em></sub>Fe<sub>3 − <em>x</em> − <em>y</em></sub>O<sub>4</sub> ferrites have been prepared from hydroxide precursors leading to fine spherical particles. The so-obtained products have quite high substitution rates (x ≈ 0.5 and 0 ⩽ y ⩽ 1), higher than those ever reported for <em>Mo-Co</em> ferrites. The substitution of Fe<sup>2+</sup> ions by Co<sup>2+</sup> ions, which have a stronger magnetocrystalline anisotropy, and the directional order phenomenon both involve an enhancement in coercivity. Nevertheless, because of differences in composition, in cationic distribution and in particle morphology, the <em>Mo-Co</em> ferrites synthesized according to our process show a coercive force lower than that observed by other workers. The cobalt element stabilizes the spinel structure of the ferrites by decreasing their reactivity towards oxygen. Besides, for high cobalt content, a proportion of these ions has the valency state + III.</p></div>\",\"PeriodicalId\":100304,\"journal\":{\"name\":\"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy\",\"volume\":\"325 12\",\"pages\":\"Pages 739-747\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1251-8069(97)82340-8\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1251806997823408\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1251806997823408","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Élaboration et caractérisation physico-chimique de nouveaux ferrites mixtes Mo-Co
New MoxCoyFe3 − x − yO4 ferrites have been prepared from hydroxide precursors leading to fine spherical particles. The so-obtained products have quite high substitution rates (x ≈ 0.5 and 0 ⩽ y ⩽ 1), higher than those ever reported for Mo-Co ferrites. The substitution of Fe2+ ions by Co2+ ions, which have a stronger magnetocrystalline anisotropy, and the directional order phenomenon both involve an enhancement in coercivity. Nevertheless, because of differences in composition, in cationic distribution and in particle morphology, the Mo-Co ferrites synthesized according to our process show a coercive force lower than that observed by other workers. The cobalt element stabilizes the spinel structure of the ferrites by decreasing their reactivity towards oxygen. Besides, for high cobalt content, a proportion of these ions has the valency state + III.
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