The conditions for the flux growth of new Mn-Ni oxyborates with the ludwigite structure are reported. Magnetic measurement data for the samples with nickel and manganese predominance are presented. Diamagnetic anomalies of the antiferromagnetic phases are established and analyzed in the framework of a model comprising two antiferromagnetically interacting subsystems, each being antiferromagnetically ordered.
The λ-shaped line width broadening
anomalies of octahedron
group vibrations in Rb2KMoO3F3 disordered
crystal have been revealed in the wide temperature range by Raman
technique. The line width of Mo–O and Mo–F vibrations
in this crystal is connected with the lattice disorder. The dependence
of ordering degree passing the phase transition point history has
been discovered. Wide temperature–line width area is found
below structural phase transition where different lattice disorder
can be obtained at a given temperature by varying the rate of sample
cooling. The current study demonstrates the ability of a dynamic temperature
regime to control ordering processes in crystals.
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