Structural disorder in alkaline earth metal doped Ba(x)Mn[Fe(CN)6](2(x+1)/3)·zH2O molecular magnets: a reverse Monte Carlo study.

Abstract

We report a detailed structural disorder study of the Ba(x)Mn[Fe(CN)(6)](2(x+1)/3)·zH(2)O (x = 0 and 0.3) molecular magnets by carrying out Reverse Monte Carlo (RMC) simulations of neutron diffraction data. Both samples have also been investigated using X-ray diffraction, infrared spectroscopy and dc magnetization techniques. Rietveld refinement of X-ray and neutron diffraction patterns confirmed the single phase formation for both compounds in a face-centered cubic structure. IR spectral study establishes the presence of cyanide flipping in both compounds, thereby revealing inherent structural disorder in the compounds. A ferrimagnetic coupling of Mn(2+) (S = 5/2) spins and the Fe(3+) (S = 1/2) spins is found for both compounds. Results of RMC simulations of neutron diffraction data for both compounds show that: (i) around the coordinated oxygen atoms (located at the 24e crystallographic sites with [Fe(CN)(6)] vacancies), there are formations of small clusters of non-coordinated oxygen atoms; and (ii) Ba substitution leads to a reduction in this structural disorder. The role of reduced water content as well as vacancies of [Fe(CN)(6)] towards the observed reduction in the structural disorder is discussed.

DOI: 10.1039/c0cp00008f

Cite this paper

@article{Thakur2010StructuralDI, title={Structural disorder in alkaline earth metal doped Ba(x)Mn[Fe(CN)6](2(x+1)/3)·zH2O molecular magnets: a reverse Monte Carlo study.}, author={Nidhi R. Thakur and Seikh Mohammad Yusuf and Jatinder V Yakhmi}, journal={Physical chemistry chemical physics : PCCP}, year={2010}, volume={12 38}, pages={12208-16} }