Ferroelectric properties of oxalate and phenanthroline based 1-D single chain molecular magnet {Fe~(II)(Δ)Fe~(II)(Λ)}0.5{Cr~(II)(Δ)Cr~(II)(Λ)}_(0.5)(ox)_2(phen)_2

摘要

The one - dimensional (11D) single chain molecular magnet [{Fe~(II)(Δ)Fe~(II)(Λ)}0.5{Cr~(II)(Δ)Cr~(II)(Λ)}_(0.5)(ox)_2(phen)_2] is hydrothermally synthesized using oxalate (ox) and phenanthroline (phen) ligands with transition metal ions (Fe and Cr). The compound is characterized using x-ray diffraction, dc magnetization measurements and P-E ferroelectric loop measurements. The diffraction analysis using Rietveld refinement confirms a single phase formation of the compound in monoclinic structure with space group of P2_1. The compound crystallizes in 1-D chain like structure containing two different crystallographic sites of metal ions (Δ- and Λ-), which are bridged by the ox ligand and Phen ligand. These two metals site are different in bond length and bond angles results lattice distortions. The lattice distortion induces ferroelectric behavior in the compound which is discussed in terms of lattice distortion induced dipole moments.