Jump to main content
Jump to site search


Remarkable Annealing Time Effect on Magnetic Properties of Single Source Coordination Polymer Precursor derived CoFe2O4 Nanoparticles

Abstract

A bimetallic coordination polymer (CP) {(H2pip)[Co1/3Fe2/3(pydc-2,5)2(H2O)]•2H2O}{where H2pip = piperazinediium, pydc-2,5 = pyridine-2,5-dicarboxylate}, 1, has been successfully synthesized using hydrothermal technique. To establish the structure and confirm the phase purity of 1, the PXRD pattern of the synthesized compound has been compared with the simulated PXRD pattern generated from the single-crystal X-ray data of isomorphous pure Fe compound synthesized earlier by us. Systematic characterization of compound 1 was performed by IR, TGA, SEM and EDX elemental mapping analysis. Compound 1 was used as single-source precursor for the preparation of nano-sized CoFe2O4 with different sizes through thermal decomposition under different condition. The precursor annealed at 300C results in an amorphous sample and crystalline phase is achieved at 325C. The temperature 325C attended at 5C/min and dwelled for 30 min for one sample (sample 2) and switched off the furnace within 2 min after attainment of temperature to get another sample (sample 3). The amorphous phase is labelled as sample 4. The so obtained CoFe2O4 nanoparticles were characterized by PXRD, SEM, TEM and EDX elemental mapping analysis. The particle sizes of the samples are 11 nm and 13 nm, respectively for 2 min and 30 min treated samples. The differential thermal treatment by half an hour results in a dramatic change in the magnetic properties of cobalt ferrite. Sample 2 exhibits four times larger magnetization at room temperature than that of sample 3 though they have comparable particle size. This result can be ascribed to the preferential occupancy of Co2+ in octahedral sites with increase in temperature, which eventually produces large magnetocrystalline anisotropy.

Back to tab navigation

Supplementary files

Publication details

The article was received on 03 Sep 2019, accepted on 05 Nov 2019 and first published on 05 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ04550C
New J. Chem., 2019, Accepted Manuscript

  •   Request permissions

    Remarkable Annealing Time Effect on Magnetic Properties of Single Source Coordination Polymer Precursor derived CoFe2O4 Nanoparticles

    P. Mahata, Md. M. Seikh, D. GHOSH, D. K. Singha and O. I. Lebedev, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ04550C

Search articles by author

Spotlight

Advertisements