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- Title
Synthesis of a mixed-metal spinel, NiMn<sub>2</sub>O<sub>4</sub>, through site-selective substitution in MOF, [(NiMn<sub>2</sub>){C<sub>6</sub>H<sub>3</sub>(COO)<sub>3</sub>}<sub>2</sub>]: synthesis, structure and magnetic studies.
- Authors
Sarma, Debajit; Mahata, Partha; Natarajan, Srinivasan
- Abstract
A mixed-metal metal-organic framework (MOF) compound [NiMn2{C6H3(COO)3}2], I, is prepared hydrothermally by replacing one of the octahedral Mn2+ ions in [Mn3{C6H3(COO)3}2] by Ni2+ ions. Mag-netic studies on I suggest antiferromagnetic interac-tions with weak canted antiferromagnetism below 8 K. On heating in flowing air I transforms to NiMn2O4 spinel at low temperature (T < 400°C). The thermal decomposition of I at different temperatures results in NiMn2O4 with particle sizes in the nano regime. The nanoparticle nature of NiMn2O4 was confirmed using PXRD and TEM studies. Magnetic studies on the nanoparticles of NiMn2O4 indicate ferrimagnetism. The transition temperature of NiMn2O4 nanoparticles exhibits a direct correlation with the particle size. This study highlights the usefulness of MOF com-pound as a single-source precursor for the prepara-tion of important ceramic oxides with better control on the stoichiometry and particle size.
- Subjects
NICKEL compounds synthesis; METAL-organic frameworks; NANOPARTICLES; SUBSTITUTION reactions; MAGNETIC properties; CRYSTAL structure; METAL ions
- Publication
Current Science (00113891), 2012, Vol 103, Issue 10, p1185
- ISSN
0011-3891
- Publication type
Article