02118nas a2200253   4500008004100000022001400041245010600055210006900161260007900230300001000309490000700319520118900326653003001515653003701545653001701582653000801599100002001607700002201627700001901649700002201668700002001690700002301710856013101733       2005                        eng d  a1044-580300aSimple oxalate precursor route for the preparation of barium-strontium titanate: Ba1-xSrxTiO3 powders0 aSimple oxalate precursor route for the preparation of bariumstro  a360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USAbELSEVIER SCIENCE INCcJAN  a63-740 v543 a<p>A simple one-step cation-exchange reaction between the stoichiometric solutions of ammonium titanyl oxalate (ATO) and barium hydroxide+strontium nitrate at room temperature (RT) is investigated successfully for the quantitative precipitation of barium-strontium titanyl oxalate (BSTO): Ba1-xSrxTiO(C2O4)(2).4H(2)O (x=0.25) precursor powders with nearly theoretical yield (greater than or equal to99%). The pyrolysis of BSTO at 730degreesC/4 h in air produced barium-strontium titanate (Ba1-xSrxTiO3; BST) powders. The characterization studies on BSTO and BST powders by using various physico-chemical techniques: micro- and chemical analysis, differential thermal analysis (DTA)/thermo-gavimetric analysis (TGA), XRD, FTIR, X-ray fluorescence (XRF) and scanning electron microscopy (SEM) revealed that the powders formed are cubic, highly pure, stoichiometric and sub-micron-sized with nearly uniform size and shape distribution. The ceramic compacts obtained by sintering the BST pellets at 1300degreesC/4 It showed density similar to95%, dielectric constant epsilon(Tc)similar to9500, tan delta-0.15% and T(C)similar to32 degreesC. (C) 2004 Elsevier Inc. All rights reserved.</p>10abarium-strontium titanate10abarium-strontium titanyl oxalate10apermittivity10aXRF1 aKhollam, Y., B.1 aDeshpande, S., B.1 aPotdar, H., S.1 aBhoraskar, S., V.1 aSainkar, S., R.1 aDate, Sadgopal, K.  uhttps://library.ncl.res.in/content/simple-oxalate-precursor-route-preparation-barium-strontium-titanate-ba1-xsrxtio3-powders-0