{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T10:57:44Z","timestamp":1773140264081,"version":"3.50.1"},"reference-count":19,"publisher":"AIP Publishing","issue":"11","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2004,12,1]]},"abstract":"<jats:p>The structure and magnetic properties of fine Ni nanoparticles (\u223c65nm diameter) having a spontaneous surface oxide layer have been studied. The particles were prepared by the chemical reduction of nickel ions in an aqueous medium, with sodium borohydride as the reducing agent. X-ray diffraction (XRD), transmission electron microscopy, and magnetization measurements (M-H plots and field cooled\u2215zero field cooled curves) have been used for characterizing the samples. No detectable change is observed in the M-H curves or in the XRD patterns of the \u201cas prepared\u201d sample and the sample annealed in air at 573K. We have indexed both these patterns as Ni in a tetragonal crystal structure with lattice parameters a=0.4905nm, c=0.5330nm and a=0.4890nm, c=0.5310nm for the \u201cas prepared\u201d and 573K annealed sample, respectively. This is a new report about the formation of Ni in a modified crystal structure. The M-H curves of both the samples show a clear hysteretic behavior but do not saturate, thereby suggesting the existence of both ferromagnetic and paramagnetic components in the magnetization. Large coercivity values \u2248123Oe as compared to 6Oe in bulk Ni have been obtained. The magnetization results have been analyzed in correlation with X-ray diffraction and microstructure and satisfactorily explained on the basis of a core-shell model, where we consider each particle as a magnetically heterogeneous system consisting of a ferromagnetic core of Ni and an antiferromagnetic\u2215paramagnetic shell of NiO.<\/jats:p>","DOI":"10.1063\/1.1792809","type":"journal-article","created":{"date-parts":[[2004,11,22]],"date-time":"2004-11-22T23:06:20Z","timestamp":1101164780000},"page":"6782-6788","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":37,"title":["Effect of interstitial oxygen on the crystal structure and magnetic properties of Ni nanoparticles"],"prefix":"10.1063","volume":"96","author":[{"given":"Aparna","family":"Roy","sequence":"first","affiliation":[{"name":"Department of Physics and Meteorology, Indian Institute of Technology , Kharagpur-721302, India"}]},{"given":"V.","family":"Srinivas","sequence":"additional","affiliation":[{"name":"Department of Physics and Meteorology, Indian Institute of Technology , Kharagpur-721302, India"}]},{"given":"S.","family":"Ram","sequence":"additional","affiliation":[{"name":"Material Science Center, Indian Institute of Technology , Kharagpur-721302, India"}]},{"given":"J. A.","family":"De Toro","sequence":"additional","affiliation":[{"name":"Departamento de Fisica Aplicada, Universidad de Castilla-La Mancha , 13071 Ciudad Real, Spain"}]},{"given":"J. M.","family":"Riveiro","sequence":"additional","affiliation":[{"name":"Departamento de Fisica Aplicada, Universidad de Castilla-La Mancha , 13071 Ciudad Real, Spain"}]}],"member":"317","reference":[{"key":"2024020719363996700_c1","first-page":"19","volume":"14","year":"1989","journal-title":"Mater. Res. Bull."},{"key":"2024020719363996700_c2","first-page":"35","volume":"14","year":"1989","journal-title":"Mater. Res. Bull."},{"key":"2024020719363996700_c3","doi-asserted-by":"publisher","first-page":"144416","DOI":"10.1103\/PhysRevB.65.144416","volume":"65","year":"2002","journal-title":"Phys. Rev. B"},{"key":"2024020719363996700_c4","doi-asserted-by":"crossref","first-page":"4726","DOI":"10.1021\/la00024a055","volume":"10","year":"1994","journal-title":"Langmuir"},{"key":"2024020719363996700_c5","doi-asserted-by":"publisher","first-page":"1432","DOI":"10.1103\/PhysRevLett.73.1432","volume":"73","year":"1994","journal-title":"Phys. Rev. Lett."},{"key":"2024020719363996700_c6","doi-asserted-by":"publisher","first-page":"11527","DOI":"10.1103\/PhysRevB.51.11527","volume":"51","year":"1995","journal-title":"Phys. Rev. B"},{"key":"2024020719363996700_c7","doi-asserted-by":"crossref","first-page":"4131","DOI":"10.1021\/la0117247","volume":"18","year":"2002","journal-title":"Langmuir"},{"key":"2024020719363996700_c8","doi-asserted-by":"publisher","first-page":"5743","DOI":"10.1021\/ja0156340","volume":"123","year":"2001","journal-title":"J. Am. Chem. Soc."},{"key":"2024020719363996700_c9","doi-asserted-by":"crossref","first-page":"1129","DOI":"10.1002\/1521-396X(200112)188:3<1129::AID-PSSA1129>3.0.CO;2-5","volume":"188","year":"2001","journal-title":"Phys. Status Solidi A"},{"key":"2024020719363996700_c10","first-page":"17","volume-title":"CRC Handbook of Chemistry and Physics","edition":"72 ed."},{"key":"2024020719363996700_c11","first-page":"474","volume":"32","year":"1994","journal-title":"Inorg. Chem."},{"key":"2024020719363996700_c12","doi-asserted-by":"publisher","first-page":"151","DOI":"10.1016\/S0925-8388(98)00857-3","volume":"283","year":"1999","journal-title":"J. Alloys Compd."},{"key":"2024020719363996700_c13"},{"key":"2024020719363996700_c14","first-page":"347","volume-title":"Introduction to Magnetic Materials","year":"1972"},{"key":"2024020719363996700_c15","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1016\/0304-8853(95)00535-8","volume":"153","year":"1996","journal-title":"J. Magn. Magn. Mater."},{"key":"2024020719363996700_c16","doi-asserted-by":"publisher","first-page":"337","DOI":"10.1016\/S0304-8853(00)01379-2","volume":"225","year":"2001","journal-title":"J. Magn. Magn. Mater."},{"key":"2024020719363996700_c17","doi-asserted-by":"publisher","first-page":"9778","DOI":"10.1103\/PhysRevB.45.9778","volume":"45","year":"1992","journal-title":"Phys. Rev. B"},{"key":"2024020719363996700_c18","doi-asserted-by":"publisher","first-page":"5561","DOI":"10.1063\/1.364661","volume":"81","year":"1997","journal-title":"J. Appl. Phys."},{"key":"2024020719363996700_c19","doi-asserted-by":"publisher","first-page":"1393","DOI":"10.1103\/PhysRevLett.79.1393","volume":"79","year":"1997","journal-title":"Phys. Rev. Lett."}],"container-title":["Journal of Applied Physics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.aip.org\/aip\/jap\/article-pdf\/96\/11\/6782\/18721711\/6782_1_online.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.aip.org\/aip\/jap\/article-pdf\/96\/11\/6782\/18721711\/6782_1_online.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,2,8]],"date-time":"2024-02-08T00:51:18Z","timestamp":1707353478000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.aip.org\/jap\/article\/96\/11\/6782\/949325\/Effect-of-interstitial-oxygen-on-the-crystal"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2004,12,1]]},"references-count":19,"journal-issue":{"issue":"11","published-print":{"date-parts":[[2004,12,1]]}},"URL":"https:\/\/doi.org\/10.1063\/1.1792809","relation":{},"ISSN":["0021-8979","1089-7550"],"issn-type":[{"value":"0021-8979","type":"print"},{"value":"1089-7550","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2004,12,1]]},"published":{"date-parts":[[2004,12,1]]}}}