Jeyaraj Annapackium College for Women

Periyakulam, India

Jeyaraj Annapackium College for Women

Periyakulam, India

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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.


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

Nano-sized calcium copper titanate (CCTO) powder was synthesized from a quick and innovative sol- gel process. Calcium nitrate, copper nitrate and titanium isopropoxide were used as the raw materials to synthesize the precursor product. The dried precursor powder was then milled and calcined at 450, 550, 650, 800, 850 and 950 °C for 3 h. The XRD results of the powder calcined at 800 °C indicates the formation of CCTO single phase. AFM studies shows that the average particle size of CCTO powder ranges around 80 nm. From the FTIR spectra the modes observed at 606, 525 and 463 cm -1 was assigned to vibration modes of Ca-O, Cu-O and Ti-O-Ti, respectively. The samples sintered at 1,040 °C shows high density (96%) as compared to the theoretical value. The grain sizes of sintered pellets were determined by FE-SEM and the dielectric properties were studied by LCR meter. © Springer Science+Business Media, LLC 2011.


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.


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

M-type Hexaferrites B 0.5Sr 0.5Fe 12-2xNi xZr xO 19 were synthesized and investigated. The XRD patterns show single phase of the magnetoplumbite barium strontium ferrite and no other phases were present. The samples exhibit well defined crystallization; all of them are hexagonal platelet grains. As the substitution level increased from x = 0.2 to 0.8 mol%, the grains are agglomerated and the average diameter increased. This suggests that Ni-Zr substitution increases the grain size, as observed in the FESEM micrographs. The results of magnetic measurement revealed that Ms of barium strontium hexaferrite increased when the value of x increased from 0 to 0.4 mol% and then decreased with the increasing Ni-Zr content. The Hc decreases remarkably with increasing Ni and Zr ions content. Hard magnetic material is converted into soft magnetic material when the substitution level is increased from 0.2 to 0.8 mol%. 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 highdensity magnetic recording applications. © Springer Science+Business Media, LLC 2011.


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.


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.


Jesurani S.,SRM University | Jesurani S.,Jeyaraj Annapackium College for Women | Kanagesan S.,SRM University | Velmurugan R.,SRM University | And 3 more authors.
Materials Letters | Year: 2011

The precursor of CaCu 3Ti 4O 12 (CCTO) nano particles have been successfully synthesized by sol-gel method at 90 °C. The dried precursor powder was milled and then calcined at 450 °C, 550 °C, 650 °C, 800 °C, 850 °C and 950 °C for 3 h. The phase formation of CCTO was analyzed by step by step using FTIR and XRD. Particle size and shape were evaluated by AFM. The XRD results of the powder calcined at 800 °C indicated the formation of CCTO phase. AFM studies showed that average particle size of the CCTO powder range 90-120 nm. The absorption bands corresponding to vibrations of CaO, CuO and TiOTi were observed at 606, 525 and 463 cm - 1 using FTIR. The samples sintered at 1040 °C showed the densities as high as 96% of theoretical density. The grain sizes of sintered pellets were determined by FE-SEM. The dielectric properties of prepared samples were studied by LCR meter. © 2011 Elsevier B.V. All rights reserved.


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.


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

The dielectric properties of Erbium doped CaCu 3Ti (4-x)ErxO (12-δ) with x = 0, 0.05, 0.1 were synthesized by the sol-gel self combustion method. XRD (X-ray powder diffraction) analysis confirmed the formation of single-phase material in the samples calcined at 800 °C. Crystal structure does not change on doping with Erbium and it remains cubic in all the three compositions studied. It is found that lattice parameter increases slightly with Erbium doping. The surface morphology of CaCu 3Ti (4-x) ErxO (12-δ) powders sintered at 950 °C in air for 3 h was observed using high resolution-scanning electron microscope and it shows that the grain size is in the range of 1-8 lm for these samples. Energy dispersive X-ray spectroscopy pattern confirmed the presence of Erbium with 1.9 and 4.86 atomic percentages with doping concentration. The dielectric characteristics of CaCu 3Ti (4-x)ErxO (12-δ) were studied by LCR meter in the frequency range (100 Hz-1 MHz) at various temperatures (RT to 500 °C). Interestingly, the dielectric constant increases and dielectric loss had lower values than those of undoped CCTO. © Springer Science+Business Media, LLC 2011.


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

Single-phase barium Strontium hexaferrite (Ba 0.5Sr 0.5Fe 12O 19-BSF) was synthesized by sol-gel method using metal nitrates as source and D-Fructose as a fuel. The phase formation, surface morphology and magnetic properties of the samples were analyzed by X-ray Diffraction, High-resolution Scanning Electron Microscope (HR-SEM) and Vibrating Sample Magnetometer (VSM). X-ray analysis indicates that the sintered samples were remained in hexagonal structure. The densities of the sintered samples at 1,150 °C were found to be 93% of theoretical density. HR-SEM and VSM studies reveal that the sintered samples were resulted in hexagonal structure with good magnetic properties. The average diagonal of the grains varies from 0.95 to 1.7 lm. The thermal treatment effects the growth of the hexagonal grains of ferrites. © 2011 Springer Science+Business Media, LLC.

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