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Co3-xMgxV2O8 crystals grown by the optical floating zone method
Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
Kagome staircase lattice of Co2+ ions in Co3V2O8 is attractive due to complex magnetic structure involved by geometric frustration. Mg3V2O8 is nonmagnetic compound with the same crystal structure and with the lattice parameters very close to that of Co3V2O8. Due to incongruent melting of these compounds one of the useful method of crystallization is a growth by the floating zone method in the traveling solvent zone configuration.
In this work we discuss process of growing of the mixed crystals Co3-xMgxV2O8. In the Co-reach region it is interesting to investigate the influence of perturbation of the Co system (by replacing part of Co by Mg ions) on magnetic properties. On the other hand, the magnesium reach region is interesting for EPR and optical measurements for determination of crystal field parameters of Co ions. Solid state synthesis has been performed by sintering the pressed mixture of stoichiometric amounts of CoO, MgO and V2O5. Single crystals have been grown from polycrystalline feed rods by floating zone technique carried out in the optical image furnace under O2 atmosphere.
Crystal structure of these materials is based on slightly deformed cubic close packing of oxygen ions. 3/8 of existing octahedral positions are occupied by Co2+ or Mg2+ ions and 1/8 of tetrahedral positions by V5+ ions. Possible migration of cations may involve the perturbation of crystal symmetry resulting the twinning effect sometimes observed in grown crystals.
The work was supported by the Polish State Committee for Scientific Research (KBN) under the project 1 P03B 038 27.
Presentation: Oral at E-MRS Fall Meeting 2006, Symposium K, by Jan Fink-Finowicki
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-15 10:54 Revised: 2009-06-07 00:44