@article { ISI:000227603500004, title = {Co-precipitation method for the preparation of fine ferroelectric BaBi2M2O9}, journal = {Ceramics International}, volume = {31}, number = {3}, year = {2005}, month = {JAN}, pages = {379-381}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

A simple co-precipitation technique had been successfully applied for the preparation of pure fine powders of single phase BaBi2Nb2O9. Ammonium hydroxide and ammonium oxalate were used to precipitate Ba2+, Bi3+ and Nb5+ cations simultaneously. No pyrochlore phase was formed while heating powder at 800 degrees C and pure BaBi2Nb2O9 phase was found to be formed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). The room temperature dielectric constant at 1 kHz is 100. The ferroelectric hysteresis loop parameters of these samples were also studied. (c) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

}, keywords = {dielectric properties, Electron microscopy, ferroelectric properties, powders chemical preparation}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2004.05.024}, author = {Gaikwad, S. P. and Potdar, HS and Samuel, V and Ravi, V} } @article { ISI:000230877900002, title = {Preparation of nanocrystalline ferroelectric CaBi2Ta2O9 by the urea method}, journal = {Ceramics International}, volume = {31}, number = {6}, year = {2005}, month = {JAN }, pages = {773-775}, publisher = {ELSEVIER SCI LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

A precipitate was formed when a aqueous solution of CaCl2, BiCl3, TaF5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600 degrees C yielded the nanocrystallites of ternary oxide CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (P-r) and coercive field (E-C) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70 nm. The room temperature dielectric constant was found to be 110. (c) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

}, keywords = {dielectric properties, Electron microscopy, ferroelectric properties, powders : chemical preparation}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2004.08.011}, author = {Gaikwad, S. P. and Pasricha, R and Ravi, V} } @article { ISI:000225588700025, title = {Synthesis of bismuth titanate by the urea method}, journal = {Materials Letters}, volume = {59}, number = {4}, year = {2005}, month = {FEB}, pages = {514-516}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A simple urea precipitation route was adopted for the preparation of bismuth titanate (Bi4Ti3O12) powders. Stoichiometric quantities of BiCl3 and TiOCl2 were mixed with the required amount of urea (the ratio of total metal cations to urea is five), and the mixture was heated on a water bath. This leads to the formation of precipitate, which was decomposed at 973 K. The formation of bismuth titanate was observed on calcining powders at 973 K by X-ray diffraction studies. The average particle size is found to be 100 nm by microscopy. The room temperature dielectric constant is found to be 150 at 1 kHz. The hysteresis loop parameters were also obtained by home-built Sawer-Tower circuit. (C) 2004 Elsevier B.V. All rights reserved.

}, keywords = {Ceramics, Chemical synthesis, dielectric properties, ferroelectricity, X-ray diffraction}, issn = {0167-577X}, doi = {10.1016/j.matlet.2004.10.038}, author = {Anilkumar, Mettu and Dhage, S. R. and Ravi, V.} } @article { ISI:000234951400008, title = {Preparation of nanocrystalline ferroelectric BaBi4Ti4O15 by Pechini method}, journal = {Materials Letters}, volume = {60}, number = {8}, year = {2006}, month = {APR}, pages = {1023-1025}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A gel was formed when an aqueous solution of BaCl2, BiNO3, TiOCl2 and citric acid in stoichiometric ratio is heated on a water bath. This gel on decomposition at 600 degrees C produced the nano crystallites of ternary oxide, BaBi4Ti4O15 (BBT). The phase contents and lattice parameters were Studied by the powder X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). The room temperature dielectric constant at I KHz is 90. The ferroelectric hysteresis loop parameters of these samples were also studied by a home built Sawyer-tower circuit. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {dielectric properties, Electron microscopy, ferroelectric properties, powders chemical preparation}, issn = {0167-577X}, doi = {10.1016/j.matlet.2005.10.068}, author = {Murugan, A. Vadivel and Navale, S. C. and Ravi, V.} } @article { ISI:000276938100029, title = {On the magnetic and dielectric properties of nickel-neoprene nanoconaposites}, journal = {Materials Chemistry and Physics}, volume = {121}, number = {1-2}, year = {2010}, month = {MAY}, pages = {154-160}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

Nickel nanocomposites were prepared by incorporating nickel nanoparticles in a neoprene matrix according to a specific recipe for various loadings of nickel particles. The dielectric properties of these composites were evaluated for different frequencies ranging from 100 kHz to 8 MHz at different temperatures from 30 degrees C to 120 degrees C. The dielectric permittivity increases with increase of nickel concentration. Increase in temperature enhances the permittivity initially, till 40 degrees C and thereafter the permittivity decreases. The dielectric loss exhibits relaxation peaks and the peaks shift to lower frequencies with increase in volume fraction of the nickel nanoparticles in the matrix. The evaluation of magnetic and dielectric properties of these composites suggests that the dielectric permittivity can be tailored by an appropriate loading of the filler using semi-empirical equations and the magnetic properties vary according to simple mixture equations. (C) 2010 Elsevier B.V. All rights reserved.

}, keywords = {Composite materials, dielectric properties, Elastomers, magnetic properties}, issn = {0254-0584}, doi = {10.1016/j.matchemphys.2010.01.006}, author = {Jamal, E. Muhammad Abdul and Joy, Pattayil Alias and Kurian, Philip and Anantharaman, Maliemadom R.} } @article { ISI:000317285200007, title = {Synergistic mechanical response of Nylon 6/Trogamid (R) T blends}, journal = {Journal of Applied Polymer Science}, volume = {129}, number = {1}, year = {2013}, month = {JUL}, pages = {65-72}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

Blends of semicrystalline Nylon 6 with a varying ratios of amorphous Nylon are studied for their morphological, thermal, dielectric, and mechanical behavior. Thermal analysis indicated a compositional dependant decrease in the melting and crystallization temperatures of Nylon 6. The blends exhibited a single compositional dependant glass transition temperature in dynamic mechanical thermal analysis and dielectrical relaxation spectroscopy over entire mixing ratio indicating miscibility between the blend components. The values of flexural modulus and tensile modulus of the blends are found to increase without significant loss in the impact properties. The water absorption of the blends is also lower than the values calculated by rule of mixtures. The observed synergistic behavior of the mechanical properties of the blends is indicative of presence of strong interactions in the blends components. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

}, keywords = {blends, dielectric properties, mechanical properties, polyamides, Thermal properties}, issn = {0021-8995}, doi = {10.1002/app.38693}, author = {Ridhore, Amol and Jog, Jyoti Prakash} }