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Intercalation of Hexacyanoferrate(III) Ions in Layered Double Hydroxides: A Novel Precursor To Form Ferri-/Antiferromagnetic Exchange Coupled Oxides and Monodisperse Nanograin Spinel Ferrites

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Title Intercalation of Hexacyanoferrate(III) Ions in Layered Double Hydroxides: A Novel Precursor To Form Ferri-/Antiferromagnetic Exchange Coupled Oxides and Monodisperse Nanograin Spinel Ferrites
 
Creator PANDA, HS
SRIVASTAVA, R
BAHADUR, D
 
Subject al-fe hydrotalcites
stoichiometric synthesis
thermal-decomposition
nanoparticles
size
mg
morphology
shape
iron
 
Description We report the formation and characterization of [Fe(CN)(6)](3-) intercalated Ni(II)/Fe(III) layered double hydroxides (LDHs) to form exchange coupled oxides and single crystalline monodisperse spinel ferrite in the absence of organic surfactant. The presence of excess divalent Ni ions can act as an inorganic surfactant by forming core-shell type structure during thermal decomposition of layered double hydroxide. Monodisperse spinel oxides having an average size of 76 nm were successfully separated by leaching excess nickel oxide. Transmission electron microscopy and magnetization measurements indicate the dispersion of spine] oxide having ionic interaction with NiO surrounding the spinel phase, which is further supported through electron spin resonance spectroscopy. The average crystallite/particle size estimated from X-ray line broadening and microscopic techniques along with the effective g value (2.29) obtained from electron spin resonance (ESR) spectroscopy strongly suggested the formation of single grain NiFe(2)O(4). The advantage of this method is that the excess divalent metal ions in LDHs can be used as high-temperature inorganic surfactant to restrict the growth and agglomeration of the magnetic nanoparticles by forming a divalent oxide protective layer on the surface during heat treatment. These surface modified exchange coupled magnetic oxides with antiferromagnetic NiO phase exhibit some interesting structural and magnetic properties and have some useful application.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T08:44:59Z
2011-12-26T12:48:18Z
2011-12-27T05:48:19Z
2011-07-14T08:44:59Z
2011-12-26T12:48:18Z
2011-12-27T05:48:19Z
2009
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY C, 113(22), 9560-9567
1932-7447
http://dx.doi.org/10.1021/jp8115066
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3913
http://hdl.handle.net/10054/3913
 
Language en