Magnetic ordering in polycrystalline NixZn1-xO solid solutions
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In order to examine the influence of the dilution of magnetic ions on the crystal and magnetic structure of NixZn1-xO (x = 1, 0.90, 0.80, 0.70) solid solutions we have performed neutron diffraction experiments on each sample at seven temperatures between 10 and 295 K. To determine the Neel temperatures, the magnetic susceptibility measurements were done in the temperature region between room temperature and 600 K. Starting from the known rhombohedral distortion the crystal structure has been refined in the trigonal space group R (3) over bar m. fn this space group the cations occupy octahedral 3a position (with the local symmetry (3) over bar m), while the oxygen anion is placed in the 3b position (with the local symmetry (3) over bar m). The magnetic structure for all concentrations x is found to be antiferromagnetic and the magnetic cell is the doubled nuclear cell along the c-axis. The magnetic atoms art: arranged in the planes (003) in respect to the nuclear cell. The magnetic mome...nts of two Ni2+ ions in adjacent sheets are oriented antiparallely and the magnetic vector makes an angle of 66 degrees with the c-axis. The magnetic structure is preserved upon random site dilution of the magnetic ions. This is additionally confirmed from the Brillouin-type dependence of the magnetization on temperature as well as from the t = T-N(x)/T-N(1) versus x variation obtained from the magnetic susceptibility measurements. Concentration dependence of the Neel temperature also shows that NixZn1-xO behaves like a Heisenberg antiferromagnet with the dominant nearest-neighbor interaction, in agreement with the similar (Ni, Co)(x)Mg1-xO solid solution.
Извор:Physica Status Solidi. B: Basic Research, 2000, 218, 2, 527-536
ISSN: 0370-1972 (print)