studies on nano barium strontium titanate/cellulose derivatives composites

Fullerene derivatives as nano-additives in polymer composites

SBN60, strontium-barium niobate at 100 K

The title compound, Sr0.6Ba0.4Nb2O6 (strontium barium niobium oxide), belongs to the group of strontium-barium niobates with varying composition of Sr and Ba. Their general formula can be written as Sr x Ba1 - x Nb2O6. Below the Curie temperature, T c , these materials indicate ferroelectric properties. The Curie temperature for SBN60 is equal to 346±0.5 K so the structure is in the ferroelectr...

Selectivity in biomineralization of barium and strontium.

The desmid green alga Closterium moniliferum belongs to a small number of organisms that form barite (BaSO(4)) or celestite (SrSO(4)) biominerals. The ability to sequester Sr in the presence of an excess of Ca is of considerable interest for the remediation of (90)Sr from the environment and nuclear waste. While most cells dynamically regulate the concentration of the second messenger Ca(2+) in...

Light-induced absorption in photorefractive strontium barium niobate.

Sr(0.59)Ba(0.41)Nb(2)O(6) and Sr(0.75)Ba(0.25)Nb(2)O(6) exhibit an intensity-dependent absorption in the visible spectral range. We perform pump (green)-probe (red) measurements and find variation as high as 0.45 cm(-1) in the absorption coefficient, which depends significantly on the polarization of the probe light beam. Our results indicate a nonexponential dark decay time of the induced abso...

NLTE Strontium and Barium in metal poor red giant stars

We present atmospheric models of red giant stars of various metallicities, including extremely metal poor (XMP, [ H ] < −3.5) models, with many chemical species, including, significantly, the first two ionization stages of Strontium (Sr ) and Barium (Ba ), treated in Non-Local Thermodynamic Equilibrium (NLTE) with various degrees of realism. We conclude that 1) for all lines that are useful Sr ...

Design of Tunable Band Pass Filter Using Barium Strontium

..................................................................................................iii ACKNOWLEDGEMENTS.............................................................................v LIST OF ILLUSTRATIONS...........................................................................vii LIST OF TABLES.........................................................................................