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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer-Verlag

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DOI

10.1016/0030-4220(90)90281-v

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1433-0768

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Magnetic properties of electrochemically prepared

Authors: Pramod Bhatt S M Yusuf Ranu Bhatt G Schütz
Publish Date: 2013/01/11
Volume: 17, Issue: 5, Pages: 1285-1293
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Abstract

Crystalline films thickness ∼1 μm of Prussian bluebased molecular magnets synthesized using electrochemical method at two different reduction potentials −05 and −09 V result into K01CrII 145CrIIICN6 · mH2O film 1 and K08CrII 11CrIIICN6 · mH2O film 2 respectively The structural and magnetic properties of such films are investigated using atomic force microscopy AFM Xray diffraction XRD infrared IR spectroscopy and dc magnetization measurements The film morphology examined using AFM shows uniformly distributed triangular crystallites over the substrate surface The presence of CrIII–C≡N–CrII sequence in the range of 1900 to 2300 cm−1 in IR spectra confirms formation of Prussian blue analogues The XRD results reveal information about the crystalline nature of the films and the relative intensities of the Bragg peaks change with the K+ ions The exchange interaction between Cr ions through C≡N ligand confirms that the electron transfer from C≡N molecule to Cr ions is ferrimagnetic in nature The high Curie temperatures T C are found to be ∼195 and ∼215 K for film 1 and film 2 respectively The higher value of T C is attributed to the inclusion of more K+ ions for film 2 resulting decreases in the CrIIIC≡N6 vacancies and increases in the number of nearest neighbors of CrII ions The branching in the zero fieldcooled and fieldcooled magnetization data below Curie temperature is explained in terms of kinetic behavior of magnetic domains with different cooling conditions and the presence of water molecule vacancies in the lattice

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