@article { ISI:000230338900005, title = {Low-temperature synthesis of nanocrystalline powders of lithium ferrite by an autocombustion method using citric acid and glycine}, journal = {Materials Letters}, volume = {59}, number = {21}, year = {2005}, month = {SEP}, pages = {2630-2633}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Nanocrystalline lithium ferrite is synthesized by an autocombustion method from the corresponding metal nitrates using citric acid as well as glycine as fuels. The ordered phase of lithium ferrite, in single phase form, with particle size of 32-36 nm and large coercivity, is obtained by this method at a low temperature of 200 degrees C. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {Combustion synthesis, LiFe5O8, lithium ferrite, low-temperature synthesis, Magnetic materials, Nanomaterials}, issn = {0167-577X}, doi = {10.1016/j.matlet.2005.04.005}, author = {Verma, S. and Karande, J. and Patidar, A. and Joy, Pattayil Alias} } @article { ISI:000254543000039, title = {Local electronic structure and magnetic properties of LaMn(0.5)Co(0.5)O(3) studied by x-ray absorption and magnetic circular dichroism spectroscopy}, journal = {Physical Review B}, volume = {77}, number = {12}, year = {2008}, month = {MAR}, pages = {125124}, publisher = {AMER PHYSICAL SOC}, address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, abstract = {

We have studied the local electronic structure of LaMn(0.5)Co(0.5)O(3) using soft-x-ray absorption spectroscopy at the Co-L(3,2) and Mn-L(3,2) edges. We found a high-spin Co(2+)-Mn(4+) valence state for samples with the optimal Curie temperature. We discovered that samples with lower Curie temperatures contain low-spin nonmagnetic Co(3+) ions. Using soft-x-ray magnetic circular dichroism, we established that the Co(2+) and Mn(4+) ions are ferromagnetically aligned. We also revealed that the Co(2+) ions have a large orbital moment: morb/mspin approximate to 0.47. Together with model calculations, this suggests the presence of a large magnetocrystalline anisotropy in the material and predicts a nontrivial temperature dependence for the magnetic susceptibility.

}, issn = {1098-0121}, doi = {10.1103/PhysRevB.77.125124}, author = {Burnus, T. and Hu, Z. and Hsieh, H. H. and Joly, V. L. Joseph and Joy, Pattayil Alias and Haverkort, M. W. and Wu, Hua and Tanaka, A. and Lin, H. -J. and Chen, C. T. and Tjeng, L. H.} } @article { ISI:000261361900032, title = {Low temperature synthesis of nanocrystalline lithium ferrite by a modified citrate gel precursor method}, journal = {Materials Research Bulletin}, volume = {43}, number = {12}, year = {2008}, month = {DEC}, pages = {3447-3456}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Single phase nanocrystalline lithium ferrite is synthesized by a modified citrate gel precursor technique. Ferrite nanoparticles of average size of 8 nm, obtained after calcination of the citrate gel Made by the usual method at 450 degrees C, show superparamagnetic behavior. However, small amounts of alpha-Fe(2)O(3) is formed as an impurity phase clue to the initial formation of some gamma-Fe(2)O(3) phase. Oil the other hand, when the pH of the mixed Solution is increased to 7 after the addition of ammonia Solution, a lower calcination temperature of 200 degrees C is sufficient for the formation of single phase lithium ferrite nanoparticles of size 30 nm. No impurity phases are detected when the nanocrystalline powders arc calcined at higher temperatures. The magnetic properties of the ferrite nanoparticles of different sizes obtained by calcining the powders at different temperatures are studied. (C) 2008 Elsevier Ltd. All rights reserved.

}, keywords = {Chemical synthesis, Magnetic materials, magnetic properties, Nanostructures, Oxides}, issn = {0025-5408}, doi = {10.1016/j.materresbull.2008.01.023}, author = {Verma, Seema and Joy, Pattayil Alias} }