Naslov
Tuning a cation distribution and microstructure of CoMn2O4 nanoparticles: structural and magnetic studies

Autori
Popović, Jasminka ; Jurić, Marijana ; Pajić, Damir ; Jelena, Habjanič

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts of the 29th European Crystallographic Meeting (ECM29) ; u: Acta Crystallographica Section A 71 Supplement ; 1-s535 ; MS25-P1 Abstracts of the 29th European Crystallography Meeting, Rovinj, Croatia, August 2015 / - , 2015, S393-s393

Skup
European Crystallographic Meeting (29 ; 2015)

Mjesto i datum
Rovinj, Hrvatska, 23.08.2015. - 28.08.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
spinel structure ; inversion parameter ; magnetic properties

Sažetak
Complex metal oxides, especially one crystallizing in the spinel-type family AB2O4, represent an important class of functional materials. Their unique chemical, electric, magnetic and mechanical properties have found versatile applications ranging from energy storage and conversion to magnetism, electronics and catalysis.13 Majority of recent work on spinels appears to be strongly focused on electrochemical properties, while the structural and magnetic studies have been scarce in spite of few papers reporting on very intriguing and complex but still poorly understood magnetic behaviour.4, 5 In this study we have exploited the possibility of novel synthetic route to tune the structural and microstructural properties by simple alternations in preparation conditions, 6, 7 and to, furthermore, correlate these effects to magnetic behaviour. The samples were prepared by thermal decomposition of a heterometallic single-molecular precursor {; ; ; [Co(bpy)3] [Mn2(C2O4)3].H2O}; ; ; n (1) (bpy =2, 2 bypiridine) at T=500, 700, 800 1000 C. The X-ray powder diffraction revealed increase in the unit-cell parameters of CoMn2O4 with the increase of formation temperature. This indicated on thermally induced increase of the inversion parameter within spinel lattice. Pronounced changes in the cation distribution, i.e. substitution of Co2+ by Mn3+ on the tetrahedral A site, and vice versa on the octahedral B site, were confirmed by the increase of octahedral octMO and decrease of tetrahedral tetMO bond distances. Crystal structure and graphical result of the final Rietveld refinement for the CoMn2O4 phase treated at 800 C, is shown in Fig. 1. Increase of the applied decomposition temperature was reflected greatly on the magnetic behavior of CoMn2O4, including the increase of hysteresis width, increase of blocking temperature and raised expression of the low temperature antiferromagnetic-like transition. Those effects could originate from the nano-particle growth and increasedanisotropy due to change of the inversion, as well as from the rearrangement of interactions between the spins. References: 1. Hemberger, J. et al., Nature, 2005, 434, 364. 2. Fan, H. J. et al., Nature Mater., 2006, 5, 627. 3.Matsuda, M. et al., Nature Phys., 2008, 3, 397. 4.Bordeneuve H. et al., Solid State Sci., 2010, 12, 379. 5. Zhang, H. T., Chen, X. H., Nanotechnology, 2006, 17, 1384. 6. Habjanič, J., et al., Inorg. Chem., 2014, 53, 9633. 7. Popović, J., et al. Cryst. Growth Des., 2013, 3, 2161.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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