Journal article
Tuning of physical properties of Fe-7(PO4)(6) by sodium intercalation
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JOURNAL OF ALLOYS AND COMPOUNDS
Publication Details
Author list: Kozlyakova E, Danilovich I, Volkov A, Zakharov K, Dimitrova O, Belokoneva E, Shvanskaya L, Zvereva E, Chareev D, Volkova O, Vasiliev A
Publisher: Elsevier
Place: LAUSANNE
Publication year: 2018
Volume number: 744
Start page: 600
End page: 605
Number of pages: 6
ISSN: 0925-8388
View additional information: View in Web of Science™

Abstract
The sodium intercalation of mixed - valence iron phosphate Fe32+Fe43+(PO4)(6) results in drastic transformation of its physical properties. The parent compound Fe-7(PO4)(6) reaches magnetically ordered state through succession of phase transitions at T-N1 = 45.5 K and T-N2 = 16 K marked by sharp singularities in both specific heat C-p and magnetic susceptibility chi. The introduction of sodium suppresses the formation of antiferromagnetic state down to T-N = 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 epsilon of Fe-7(PO4)(6) demonstrates a kink at T-N2, while no singularity marks T-N1. No features accompany magnetic phase transition in dielectric property of Na0.65Fe7(PO4)(6) but epsilon reaches the relaxation maxima at high temperatures which can be attributed to the freezing of sodium ions. (C) 2018 Elsevier B.V. All rights reserved.

Keywords
antiferromagnetism, magnetization, Specific heat

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Last updated on 2018-14-09 at 00:01