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Jesurani S.,Jeyaraj Annapackium College for Women | Jesurani S.,SRM University | Kanagesan S.,University Putra Malaysia | Hashim M.,University Putra Malaysia | Ismail I.,University Putra Malaysia
Journal of Alloys and Compounds | Year: 2013

Zr substituted CaCu3Ti4-xZr xO12 (CCTZO) with x = 0.00, 0.02, 0.10, 0.20 and 0.50 mol% were prepared by sol-gel route from the metal nitrate solutions, Titanium isoproxide, and zirconium oxy chloride. XRD analysis confirmed the formation of a single phase material in the samples calcinated at 800 °C for 3 h. The crystal structure did not change on doping with zirconium and it remained cubic in all the four studied compositions. The permittivity and dielectric loss of 0.1 mol% Zr doped CaCu3Ti4O12 were improved for K ≈ 6020 and tan δ ≈ 0.52 at 1 kHz after the sample had been sintered at 1040 °C for 4 h. AFM studies showed that the particle size of the CCTZO powder ranged from 47 to 85 nm. FE-SEM micrographs of the CaCu 3Ti4-xZrxO12 samples showed that the grain size was in the range of 250 nm to 5 μm for these samples. EDX studies showed the presence of calcium, copper, titanium, oxygen and zirconium. Remarkably, the dielectric constant increased and dielectric loss had lower values compared to the undoped CCTO. © 2012 Elsevier B.V. All rights reserved. Source


Kanagesan S.,University Putra Malaysia | Hashim M.,University Putra Malaysia | Jesurani S.,Jeyaraj Annapackium College for Women | Kalaivani T.,SRM University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2012

Barium strontium hexaferrite (Ba 0.5Sr 0.5Fe 12O 19-BSF) has been prepared by sol-gel process involving use of d-Fructose as a fuel. The prepared precursor was calcined in two different calcinations techniques conventional and microwave furnace. X-ray powder diffraction studies confirmed the formation of single phase Ba 0.5Sr 0.5Fe 12O 19. HR-SEM results show the morphology of the particles is hexagonal structures in platelet form. The average particle size of conventionally calcined BSF powder is 100-250 nm and that of microwave calcined powder is 30-100 nm. The broad hysteresis loop reveals that powder is well crystallized and exhibits hard magnetic properties. © 2012 Elsevier B.V. All rights reserved. Source


Kanagesan S.,SRM University | Jesurani S.,SRM University | Jesurani S.,Jeyaraj Annapackium College for Women | Velmurugan R.,SRM University | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2012

Magnetic materials are important electronic materials that have a wide range of industrial and commercial applications. Barium strontium hexaferrite (Ba 0.5 Sr 0.5Fe 12O 19-BSF) were prepared by a sol-gel method using D-Fructose as fuel and the heat treatment was carried out in a microwave furnace. The effects of the sintering temperature on the morphology, crystalline structure and magnetic properties are studied. Sintering temperature affected the grains in compact samples. The sintered product possessed dense microstructure with clear micro grains and is in consistence with the XRD analysis based on the peak intensity of the (107) plane. Magnetic measurement shows that the barium strontium hexaferrite sample sintered at 1,150 °C has the coercive field of 1,998 Gauss, remnant magnetization of 38.87 emu/g and the saturation magnetization of 53.44 emu/g. © Springer Science+Business Media, LLC 2012. Source


Kanagesan S.,SRM University | Jesurani S.,SRM University | Jesurani S.,Jeyaraj Annapackium College for Women | Velmurugan R.,SRM University | And 2 more authors.
Materials Research Bulletin | Year: 2012

M-type hexaferrites of component B 0.5Sr 0.5Fe 12-2xNi xZr xO 19 were investigated. The XRD patterns show single phase of the magnetoplumbite barium strontium ferrite and no other phases were present. Significant increase in line broadening of the XRD patterns was observed indicating a decrease of grain size. The samples exhibit well defined crystallization; all of them are hexagonal platelet grains. As the substitution level increased x = 0.2-0.8 mol%, the grains are agglomerated and the average diameter increased. The H c decreases remarkably with increasing Ni and Zr ions content. It was found that the particle size could be effectively decreased and coercivity H c could easily be controlled by varying the concentration (x) without significantly decreasing saturation magnetization. In particular, Ba 0.5Sr 0.5Fe 12-2xNi xZr xO 19 with x = 0.2, 0.4, 0.6, 0.8 mol% has suitable magnetic characteristics with particle size small enough for high-density magnetic recording applications. © 2011 Elsevier Ltd. All rights reserved. Source


Kanagesan S.,SRM University | Jesurani S.,Jeyaraj Annapackium College for Women | Velmurugan R.,SRM University | Prabu S.,Anna University | Kalaivani T.,SRM University
Journal of Materials Science: Materials in Electronics | Year: 2012

A series of Ni-Co substituted barium strontium hexaferrite materials, Ba 0.5Sr 0.5Ni xCo xFe 12-2xO 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8 mol%) was synthesized by the sol-gel method. X-ray diffraction analysis has shown that the Ni- Co substitutions maintain in a single hexagonal magnetoplumbite phase. The room temperature magnetic properties and the cation site preferences of Ni-Co substituted ferrite were investigated by VSM. Substitutions led to decrease in coercivity while saturation magnetization remains the almost same. It indicates that the saturation magnetization (52.81-59.8 Am 2/kg) and coercivity (69.83-804.97 Oe) of barium strontium hexaferrite samples can be varied over a very wide range by an appropriate amount of Ni-Co doping contents. © Springer Science+Business Media, LLC 2012. Source

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