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dc.date.accessioned | 2019-01-22T20:38:21Z | |
dc.date.available | 2019-01-22T20:38:21Z | |
dc.date.issued | 2018 | |
dc.identifier.issn | 0925-8388 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/148082 | |
dc.description.abstract | © 2018 Elsevier B.V. The sodium intercalation of mixed – valence iron phosphate Fe32+Fe43+(PO4)6 results in drastic transformation of its physical properties. The parent compound Fe7(PO4)6 reaches magnetically ordered state through succession of phase transitions at TN1 = 45.5 K and TN2 = 16 K marked by sharp singularities in both specific heat Cp and magnetic susceptibility χ. The introduction of sodium suppresses the formation of antiferromagnetic state down to TN = 33 K in Na0.65Fe7(PO4)6. The low temperature phase transition in this compound smears being substituted by broad anomalies in magnetization and specific heat related to the spin/charge disorder effects. The sharp well resolved electron spin resonance spectra in parent material transform into asymmetric broad line in sodium – intercalated substance. The dielectric permittivity ε of Fe7(PO4)6 demonstrates a kink at TN2, while no singularity marks TN1. No features accompany magnetic phase transition in dielectric property of Na0.65Fe7(PO4)6 but ε reaches the relaxation maxima at high temperatures which can be attributed to the freezing of sodium ions. | |
dc.relation.ispartofseries | Journal of Alloys and Compounds | |
dc.subject | Antiferromagnetism | |
dc.subject | Dielectric permittivity | |
dc.subject | Intercalation | |
dc.subject | Iron phosphate | |
dc.subject | Magnetization | |
dc.subject | Specific heat | |
dc.title | Tuning of physical properties of Fe<inf>7</inf>(PO<inf>4</inf>)<inf>6</inf> by sodium intercalation | |
dc.type | Article | |
dc.relation.ispartofseries-volume | 744 | |
dc.collection | Публикации сотрудников КФУ | |
dc.relation.startpage | 600 | |
dc.source.id | SCOPUS09258388-2018-744-SID85042118132 |