The structural and magnetic properties of Bi

_{6}

_{2}

_{3}

_{18}

and Bi

_{6}

FeCrTi

_{3}

_{18}

are investigated. The samples can be indexed by an orthorhombic lattice with the space group B2cb and the valence state of Fe and Cr ions is suggested to be

+

3 based on the x-ray photoelectron spectroscopy spectra. The sample Bi

_{6}

_{2}

_{3}

_{18}

is paramagnetic with the presence of a short-range antiferromagnetic ordering; whereas Bi

_{6}

FeCrTi

_{3}

_{18}

undergoes a short-range ferrimagnetic-like transition at 106 K originating from the spin canting of the antiferromagnetic coupling of Fe-based and Cr-based sublattices via the Dzyaloshinskii-Moriya interaction due to the distorted crystal structure of Bi

_{6}

FeCrTi

_{3}

_{18}

, which are in agreement with the EPR results. The magnetic structure and EPR spectra of Bi

_{6}

_{2}

_{3}

_{18}

and Bi

_{6}

FeCrTi

_{3}

_{18}

can be understood by the presence of a small amount of isolated Fe

^{3 +}

ions in an octahedral ligand field with a low symmetry and the coupling between the random occupancy of Fe

^{3 +}

and/or Cr

^{3 +}

ions in other two octahedral sites in the layered structure of Aurivilius phase.

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