OPTICAL BAND GAP ANALYSIS OF NANO-CRYSTALLINE CERAMIC PbSrCaCuO

ABSTRACTNano-crystalline Ceramic PbSrCaCuO have been prepared by a high-energy ball milling process through mechanically assisted synthesis. The prepared sample was then subjected to calcinations to acquire the desired homogeneity and phase formation. UV-VIS analysis of the sample was carried to study the optical properties of the sample. The band gap energy of the sample shows a marked variation in their value with the increase in temperature. The refractive index n was calculated and  the results obtained is plotted  with the wavelength. The refractive-index curves also show a systematic variation with temperature

THERMOGRAVIMETRIC ANALYSIS OF NANO CRYSTALLINE CERAMIC PbSrCaCuO

Nano crystalline ceramic PbSrCaCuO was prepared by the solid state technique via a high-energy ball milling process through mechanically assisted synthesis.The prepared sample was then subjected to calcinations to acquire the desired homogeneity and phase formation. To establish the elemental composition EDX analysis was done.TGA and DTA were used to study the behaviour of the sample upon heating to a high temperature

Dynamic mechanical analysis and thermal degradation of jute fiber reinforced BSFT(Ba0.6Sr0.4FexTi(1-x) O3-δ), (x=0.1)- polypropylene composite

Recent research shows that the natural fibers from renewable natural resources have greater potential than other man-made fibers. Attempts have been carried out to study the effect of fiber loading and temperature on jute fiber reinforced BSFT (Ba0.6Sr0.4FexTi(1-x) O3-δ), (x=0.1)-polypropylene composites using DMA and thermal techniques. The intrinsic design and morphology of the components of the system define the dynamic mechanical properties of the composite. For lower temperatures, the storage modulus (E') values are maximum for the neat PP whereas at temperatures above Tg, the E' values have been found to be maximum for composites with higher fiber loading, proving that the incorporation of jute fiber in BSFT-polypropylene matrix induces reinforcing effects at elevated temperatures. The loss modulus and damping peaks have been found to be lowered by the incorporation of fiber. Cole–Cole analysis throws light on the phase behavior of the composite samples. Thermo gravimetric analysis result on the enhanced thermal stability by the incorporation of fibers. The whole study reveals the enhancement in the dynamic, mechanical and thermal properties of the BSFT-PP composite on incorporation of jute fiber

MATERIAL CHARACTERIZATION OF SUPERCONDUCTING NANO CRYSTALLINE CERAMIC YSrBiCuO BY THERMAL TECHNIQUES

The nano-sized ceramic superconducting material YSBCO having perovskite structure was prepared according to the chemical formula by the thermo chemical solid state reaction technique using a high-energy ball milling process through mechanically assisted synthesis. It was characterized by XRD, SEM and EDX. Here the authours studied the thermal characterization using TGA, DTA and DSC

Dynamic mechanical analysis and thermal degradation of jute fiber reinforced BSFT(Ba_0.6Sr₀.₄Fe_xTi_(1-x) O_3-δ), (x=0.1)- polypropylene composite

497-502Recent research shows that the natural fibers from renewable natural resources have greater potential than other man-made fibers. Attempts have been carried out to study the effect of fiber loading and temperature on jute fiber reinforced BSFT (Ba0.6Sr0.4FexTi(1-x) O3-δ), (x=0.1)-polypropylene composites using DMA and thermal techniques. The intrinsic design and morphology of the components of the system define the dynamic mechanical properties of the composite. For lower temperatures, the storage modulus (E') values are maximum for the neat PP whereas at temperatures above Tg, the E' values have been found to be maximum for composites with higher fiber loading, proving that the incorporation of jute fiber in BSFT-polypropylene matrix induces reinforcing effects at elevated temperatures. The loss modulus and damping peaks have been found to be lowered by the incorporation of fiber. Cole–Cole analysis throws light on the phase behavior of the composite samples. Thermo gravimetric analysis result on the enhanced thermal stability by the incorporation of fibers. The whole study reveals the enhancement in the dynamic, mechanical and thermal properties of the BSFT-PP composite on incorporation of jute fiber

Dielectric Response and Transport Properties of Pb2Sr2CaCu2O9 [Lead Strontium Calcium Copper Oxide]

High dielectric permittivity, good mechanical properties and excellent thermal stability are highly desired qualities for the dielectric materials used in embedded capacitors and energy-storage devices. This study reports the temperature dependence and very low loss factor of Pb2Sr2CaCu2O9 ceramics. X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to analyze the sample. The dielectric properties of the material prepared has been investigated in the frequency range 42–1MHz and in the temperature range 303–873K. The result reveals that Pb2Sr2CaCu2O9 have high dielectric constant with significant temperature and frequency dependence which makes them appropriate in the application of miniaturization of electronic devices. The dielectric constant and the loss factor decreases with increase in frequency of the applied field. Impedance studies confirm that dielectric relaxation in the material is of non-Debye type. Conductivity studies proves quality information related to the charge transport properties. The frequency analysis of modulus properties pictures a distribution of the relaxation time existing in the system. The new ceramic material Pb2Sr2CaCu2O9 will be a promising candidate for uses in embedded capacitors, especially in high-temperature circumstance

Electrical and mechanical properties of samarium barium copper oxalate crystals

30-32Samarium barium copper oxalate (SmBaCuOx) crystals were grown using silica gel technique by the diffusion of a mixture of samarium chloride, barium chloride and cuprous nitrate into the test tube having the set gel containing oxalic acid. The grown crystals were characterized by X-ray diffraction analysis, Inductively Coupled Plasma Atomic Emission analysis and microhardness measurements. The variation of dielectric constant εɼ and dielectric loss D in the frequency range100Hz - 1MHz has been studied and reported. The electrical conductivity of SmBaCuOx crystals was found to increase with increase of frequency

Impedance spectroscopy and dielectric studies of nanocrystalline iron doped barium strontium titanate ceramics

Barium titanate compounds have great research attention due to their good electric and in some case interesting magnetic properties. The synthesis and characterization of iron doped barium strontium titanate (BSFTO) make an attempt to understand its structure and investigate electric/dielectric properties. The formation of a perovskite compound with tetragonal phase was confirmed through X-ray structural studies. Dielectric and electrical impedance properties of the sintered BSFTO ceramics were measured in the frequency range from 42 Hz to 2 MHz and at different temperatures (up to 600 °C). It was shown that the properties of this material are highly dependent on temperature and frequency. The nature of frequency dependence of AC conductivity confirms the Jonscher’s power law. The temperature dependence of DC conductivity obeys the Arrhenius behaviour

INVESTIGATION OF THE ABSORPTION COEFFICIENT, REFRACTIVE INDEX, ENERGY BAND GAP, DISPERSION ENERGY AND URBACH ENERGY OF NANOCRYSTALLINE CERAMIC SUPERCONDUCTOR YSRBICUO

In this era of High temperature superconductors (HTS), having a lot of applications like high -voltage generator, Ceramic superconductor yttrium strontium bismuth copper oxide (YSBCO) was synthesized thermo chemically by solid state method at different treating temperatures. A characteristic feature of all solid-state reactions is that they involve the formation of product phase(s) at the interfaces of the reactants. UV-VIS analysis of the sample was carried out. Tunable band gaps can be obtained by varying annealing temperatures. The optical constants of refractive index, normal-incidence reflectivity, extinction coefficient, and absorption coefficient showed systematic variation with temperature. The dispersion of refractive index was analyzed by the Wemple-Di Domenico singleoscillator model. Urbach energy was elucidated from the raw data