Transport properties of the
Ni MV O (M(II)=Cr and Fe)
2
3
11
and M Fe (VO4) (M(II)=Mg
3
4
6
and Mn) compounds
1,2 2 1 2 3
N. Guskos , J. Typek , K. Karkas , A. Guskos , A. B³oñska-Tabero
3
and M. Bosacka
1
Department of Physics, University of Athens, Panepistimiopolis, 15 784 Zografos, Athens, Greece
2Institute of Physics, West Pomeranian University of Technology, Al. Piastow 48, 70-311 Szczecin, Poland
3Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology,
Al. Piastow 17, 70-310 Szczecin, Poland
Transport properties of the multicomponent vanadate oxides Ni MV O (M(II)=Cr(II) and Fe(III)) and M Fe (VO4) 2 3 11 3 4 6 (M(II)=Mg(II) and Mn(II) have been investigated by electrical conductivity measurements. All compounds exhibit
5
semiconducting behavior. Former two samples have shown many orders of magnitude (over 10 times at RT) better conducting properties than the later two (see Fig.1). Replacement of the magnetic Cr(II) cation with magnetic Fe(III) ion in Ni MV O results in a significat increase of its electrical conductivity at RT and an increase of the activation energy. Very 2 3 11 low conductivity is registered in M Fe (VO4) system in which replacement of a non-magnetic Mg(II) ion with magnetic 3 4 6 Mn(II) ion causes a strong decrease of conductivity. The system M Fe (VO4) possessing many sublattices with magnetic 3 4 6 ions and displaying competing magnetic interactions might be susceptible to drastic changes of their transport properties by ion replacements.
Acknowledgements
Publication of this paper was realised with partial financial support from the budget resources of the West Pomeranian Voivodeship.
Fig. 1 Temperature dependence of the resistivity for four different multicomponent vanadate oxides.
0 .0 0 3 0 .0 0 4 0 .0 0 5 0 .0 0 6 0 .0 0 7 0 .0 0 8 0 .0 0 9 0 .0 1 0 0 .0 1 1 1 2 1 4 1 6 1 8 2 0 2 2 0 1 x1 09 2 x1 09 3 x1 09 4 x1 09 5 x1 09 6 x1 09 7 x1 09 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 Ln ( r [ W cm ]) 1 /T [K-1] N i 2C rV3O1 1 0 .3 5 4 e V 0 .1 6 8 e V T e m p e ra tu re [K ] R es is tiv ity , r [ W cm ] 0 .0 0 3 0 .0 0 4 0 .0 0 5 0 .0 0 6 0 .0 0 7 0 .0 0 8 0 .0 0 9 0 .0 1 0 0 .0 1 1 1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 0 1 x1 01 0 2 x1 01 0 3 x1 01 0 4 x1 01 0 5 x1 01 0 6 x1 01 0 7 x1 01 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 Ln ( r [ W cm ]) 1 /T [K-1] N i 2F e V3O1 1 0 .6 1 7 e V 0 .1 9 5 e V T e m p e ra tu re [K ] R es is tiv ity , r [ W cm ] 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.010 0.011 16 18 20 22 24 26 0.0 2.0x1010 4.0x1010 6.0x1010 8.0x1010 1.0x1011 1.2x1011 1.4x1011 1.6x1011 1.8x1011 100 150 200 250 300 L n ( r [ W cm ]) 1 /T [K-1] 0 .0 2 2 e V 0 .7 8 4 e V M g 3F e4(V O4)6 T e m p e ra tu re [K ] R e si st iv ity , r [ W cm ] 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.010 0.011 20 21 22 23 24 25 26 0.0 2.0x1010 4.0x1010 6.0x1010 8.0x1010 1.0x1011 1.2x1011 1.4x1011 100 150 200 250 300 L n ( r [ W cm ]) 1 /T [K-1] 1 .0 1 2 e V M n 3F e4(V O4)6 T e m p e ra tu re [K ] R e si st iv ity , r [ W cm ]
