Study of magnetic properties of a new vanadate Cu 13 Fe 4 V 10 O 44 Janusz Typek Institute of Physics, West Pomeranian University of Technology, Szczecin,

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Presentation transcript:

Study of magnetic properties of a new vanadate Cu 13 Fe 4 V 10 O 44 Janusz Typek Institute of Physics, West Pomeranian University of Technology, Szczecin, Poland

Outline Why new vanadate Cu 13 Fe 4 V 10 O 44 Sample preparation and chemistry Measuring methods: dc magnetometry and EPR Results of dc magnetization measurements Results of EPR measurements Conclusions about magnetic structure

Why to study Cu 13 Fe 4 V 10 O 44 ? Similar compounds from the same system of vanadates have important catalytic properties Defect structure and grain surface play an important role in catalysis Knowledge of magnetic defects and ions may lead to better understanding of the mechanism of the catalytic processes

Sample preparation 13 CuO + 5 V 2 O Fe 2 O 3 → Cu 13 Fe 4 V 10 O 44 A. Blonska-Tabero, J. Therm. Anal. Calorim. 110 (2012) 161

Structure – possible types Lyonsite,  -Cu 3 Fe 4 (VO 4 ) 6, a new iron-copper vanadate mineral six isolated VO 4 tetrahedra FeO 6 octahedra square-planar CuO 4 groups Howardewansite Mineral NaCuFe 2 (VO 4 ) 3 In figure Mn 3 Fe 4 (VO 4 ) 6 VO 4, FeO 6, MnO 5, MnO 4 polyhedra

EPR and dc magnetometry Magnetic resonance spectrometer X-band, Bruker E 500 (1997) Magnetic Property Measurements System MPMS XL-7, Quantum Design (2011) Dynamics τ~ sStatic τ~1 s

dc magnetization: susceptibility study

dc magnetization: reciprocal susceptibility

dc magnetization: Curie-Weiss law Fe 3+, 3d 5, high-spin S=5/2, L=0, J=5/2,, for g=2  μ=5.9 μ B

dc magnetization: high-temperature range energy non-magnetic magnetic

dc magnetization in an external field T [K]g J C H [μ B /f.u.·Oe] 21.15(2)3.00(3)· (3)2.00(5)· (6) (2)0 Modified Langevin AFM clusters

EPR: spectra and fitting Lorentzian lineshape B r - resonance field ΔB -linewidth I int – integrated intensity

EPR: g-factor

EPR: linewidth

EPR: linewidth vs. resonance field

I 0 =5.373·10 10, C 2 =1.13·10 12, T CW =-60.2 K. EPR: integrated intensity AFM clusters

General picture of the magnetic state of Cu 13 Fe 4 V 10 O 44

THE END Thank you!