Saleh M Matar, Galal H Ramzy, Muhammad Arif, Ibrahim M Maafa, Ayman Yousef, Nasser Zouli, Ahmed F F Abouatiaa, Abdel Samed M Adam, Isam Y Qudsieh, Ahmed I Ali, Elbadawy A Kamoun, Amr Ali
{"title":"用于永磁体的Nd x Co1-x Fe2O4杂化纳米粒子的化学合成：结构、磁性和电学性质。","authors":"Saleh M Matar, Galal H Ramzy, Muhammad Arif, Ibrahim M Maafa, Ayman Yousef, Nasser Zouli, Ahmed F F Abouatiaa, Abdel Samed M Adam, Isam Y Qudsieh, Ahmed I Ali, Elbadawy A Kamoun, Amr Ali","doi":"10.1039/d5na00197h","DOIUrl":null,"url":null,"abstract":"<p><p>Nd-doped CoFe<sub>2</sub>O<sub>4</sub> spinel ferrites were synthesized <i>via</i> the sol-gel method, confirming a cubic spinel structure. Increasing Nd concentration expanded the lattice parameter (8.3900-8.4231 Å) and unit cell volume while reducing grain size. FT-IR analysis validated the spinel phase. Nd doping enhanced the dielectric constant by affecting space charge polarization and charge hopping, with conductivity following a Debye-type relaxation mechanism. Cole-Cole plots indicated grain boundary effects and polaron hopping conduction. Magnetic properties improved with Nd<sup>3+</sup> content, with <i>M</i> <sub>s</sub> and <i>H</i> <sub>c</sub> reaching 5.621 emu g<sup>-1</sup> and 143.43 Oe at 4% doping. A transition from an antiferromagnetic to a ferromagnetic state was observed, with a high Curie temperature (<i>T</i> <sub>m</sub>) of 292 °C, confirming a stable ferromagnetic phase. These findings highlight Nd-doped CoFe<sub>2</sub>O<sub>4</sub> as a promising candidate for permanent magnet applications.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11949247/pdf/","citationCount":"0","resultStr":"{\"title\":\"Chemical synthesis of Nd <sub><i>x</i></sub> Co<sub>1-<i>x</i></sub> Fe<sub>2</sub>O<sub>4</sub> hybrid nanoparticles for permanent magnet applications: structural, magnetic and electrical properties.\",\"authors\":\"Saleh M Matar, Galal H Ramzy, Muhammad Arif, Ibrahim M Maafa, Ayman Yousef, Nasser Zouli, Ahmed F F Abouatiaa, Abdel Samed M Adam, Isam Y Qudsieh, Ahmed I Ali, Elbadawy A Kamoun, Amr Ali\",\"doi\":\"10.1039/d5na00197h\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Nd-doped CoFe<sub>2</sub>O<sub>4</sub> spinel ferrites were synthesized <i>via</i> the sol-gel method, confirming a cubic spinel structure. Increasing Nd concentration expanded the lattice parameter (8.3900-8.4231 Å) and unit cell volume while reducing grain size. FT-IR analysis validated the spinel phase. Nd doping enhanced the dielectric constant by affecting space charge polarization and charge hopping, with conductivity following a Debye-type relaxation mechanism. Cole-Cole plots indicated grain boundary effects and polaron hopping conduction. Magnetic properties improved with Nd<sup>3+</sup> content, with <i>M</i> <sub>s</sub> and <i>H</i> <sub>c</sub> reaching 5.621 emu g<sup>-1</sup> and 143.43 Oe at 4% doping. A transition from an antiferromagnetic to a ferromagnetic state was observed, with a high Curie temperature (<i>T</i> <sub>m</sub>) of 292 °C, confirming a stable ferromagnetic phase. These findings highlight Nd-doped CoFe<sub>2</sub>O<sub>4</sub> as a promising candidate for permanent magnet applications.</p>\",\"PeriodicalId\":18806,\"journal\":{\"name\":\"Nanoscale Advances\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-03-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11949247/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nanoscale Advances\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1039/d5na00197h\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nanoscale Advances","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d5na00197h","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Chemical synthesis of Nd x Co1-x Fe2O4 hybrid nanoparticles for permanent magnet applications: structural, magnetic and electrical properties.
Nd-doped CoFe2O4 spinel ferrites were synthesized via the sol-gel method, confirming a cubic spinel structure. Increasing Nd concentration expanded the lattice parameter (8.3900-8.4231 Å) and unit cell volume while reducing grain size. FT-IR analysis validated the spinel phase. Nd doping enhanced the dielectric constant by affecting space charge polarization and charge hopping, with conductivity following a Debye-type relaxation mechanism. Cole-Cole plots indicated grain boundary effects and polaron hopping conduction. Magnetic properties improved with Nd3+ content, with Ms and Hc reaching 5.621 emu g-1 and 143.43 Oe at 4% doping. A transition from an antiferromagnetic to a ferromagnetic state was observed, with a high Curie temperature (Tm) of 292 °C, confirming a stable ferromagnetic phase. These findings highlight Nd-doped CoFe2O4 as a promising candidate for permanent magnet applications.
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