Estimation of some essential, non essential toxic and toxic elements in some Indian black tea sold in market by ‘ICP-MS’ and their risk assessment.

226-230Tea ‘Camellia sinensis’ is the most consumed non essential, non alcoholic liquid in the world. Black Tea finds its place in Indian culture as well as a part of diet of Indian population. Tea is known for its relaxing effect and therapeutic use as it contains bioactive polyphenols, amino acids, caffeine, theophylline and volatile organic compounds. Significant research efforts have been carried out on Tea for its health benefits. However, some ill effects also have been reported. Present work has been carried out to determine the essential, non essential toxic and toxic elements namely Iron (Fe), Copper (Cu), Cobalt (Co), Chromium (Cr), Aluminum (Al), Arsenic (As) and Lead (Pb); health risks associated with them among adult population. For this, the twelve well known and most selling (most consumed) Tea brands available in local Indian market were selected and analyzed by sophisticated instrument ICP-MS

Structural and dielectric properties of 0.75PMN-0.25PT relaxor ferroelectrics with different frequencies at room temperature

18-21In the present work, the composition of 0.75PMN-0.25PT solid solution was synthesized by columbite precursor method with multiple heat treatments at 920°C and 1200 °C. XRD data shows the perovskite structure with minimized pyrochlore phase and intense peaks. It has been observed that the pyrochlore phase can be reduced by increase in sintering temperature. SEM report shows the polygonal, dense and compact grain boundaries. Dielectric study shows the effect of variation in frequency to the dielectric constant and electrical conductivity at room temperature

Structural and frequency dependent dielectric properties of 0.90PMN-0.10PT ferroelectrics at room temperature

188-192In the present study, the composition of (1-x)PMN-(x)PT for X=0.10 binary solid solution was synthesized by double step columbite precursor method with multiple heat treatments at different temperatures. XRD analysis shows the single perovskite phase with minimized pyrochlore phase. The intense peaks of XRD pattern indicates the perovskite phase of composition. It was observed that the pyrochlore phase in the material can be reduced by increase in sintering temperature and proper stoichiometry. SEM micrograph shows the polygonal, dense and compact grain boundaries. Room temperature frequency dependent nature of Dielectric constant and tangent loss of prepared composition was also measured