01545nas a2200229   4500008004100000022001400041245005700055210005700112260007300169300001400242490000700256520082500263653001301088653002301101653002401124653002101148653001101169100001801180700001701198700001301215856008701228       2005                        eng d  a0167-577X00aPreparation of ferroelectric BaNb2O6 the urea method0 aPreparation of ferroelectric BaNb2O6 the urea method  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN  a1929-19310 v593 a<p>A precipitate was formed when an aqueous solution of BaCl2, NbF5 and urea in required ratio (the ratio of total metal cations to the urea is five) is heated on a water bath at 100 degrees C. This precipitate on decomposition at 600 degrees C yielded the nanocrystallites of BaNb2O6 (BN), as confirmed by X-ray diffraction study (XRD). This is a much lower temperature as compared to that prepared by traditional solid state method (1000 degrees C) as reported for the formation of BaNb2O6. Transmission electron microscope (TEM) investigations revealed that the average particle size is 85 nm for the calcined powders. The room temperature dielectric constant at 1 kHz is found to be 900. The ferroelectric hysteresis loop parameters of these samples were also studied. (c) 2005 Elsevier B.V. All rights reserved.</p>10aCeramics10aChemical synthesis10aelectronic material10aferroelectricity10aOxides1 aDhage, S., R.1 aPasricha, R.1 aRavi, V.  uhttps://library.ncl.res.in/content/preparation-ferroelectric-banb2o6-urea-method-001228nas a2200229   4500008004100000022001400041245005600055210005600111260007300167300001200240490000700252520051400259653001300773653002300786653002400809653001100833653002200844100001800866700001700884700001300901856008400914       2005                        eng d  a0167-577X00aSynthesis of fine particles of ZnO at 100 degrees C0 aSynthesis of fine particles of ZnO at 100 degrees C  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a779-7810 v593 a<p>A simple gel to crystal conversion route has been followed for the preparation of fine ZnO at 80-100 degreesC under refluxing conditions. Freshly prepared zinc hydroxide gel is allowed to crystallize under refluxing and stirring conditions for 4-6 It. Formation of fine crystallites of ZnO is confirmed by X-ray diffraction (XRD) study. Transmission electron microscope (TEM) investigations revealed that the average particle size is 100 nm for these powders. (C) 2004 Elsevier B.V All rights reserved.</p>10aCeramics10aChemical synthesis10aElectron microscopy10aOxides10aX-ray diffraction1 aDhage, S., R.1 aPasricha, R.1 aRavi, V.  uhttps://library.ncl.res.in/content/synthesis-fine-particles-zno-100-degrees-c-001488nas a2200217   4500008004100000022001400041245004800055210004600103260007300149300001400222490000700236520083300243653001301076653002401089653002101113653001101134100001801145700001701163700001301180856007701193       2005                        eng d  a0167-577X00aSynthesis of Sr0.5Ba0.5Nb2O6 by urea method0 aSynthesis of Sr05Ba05Nb2O6 by urea method  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a1053-10550 v593 a<p>A precipitate was formed when an aqueous solution of SrCl2, BaCl2, NbF5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath.. This precipitate on decomposition at 750 degreesC yielded the nanocrystallites of ternary oxide, Sr0.5Ba0.5Nb2O6 (SBN) as confirmed by X-ray diffraction study (XRD). This is much lower temperature as compared to that prepared by traditional solid state method (1000 degreesC as reported for the formation of SBN ceramics. Transmission electron microscope (TEM) investigations revealed that the average particle size is 100 nm for the calcined powders. The room temperature dielectric constant at 1 kHz is found to be 1050. The ferroelectric hysteresis loop parameters of these samples were also studied. (C) 2004 Elsevier B.V. All rights reserved.</p>10aCeramics10aElectron microscopy10aferroelectricity10aOxides1 aDhage, S., R.1 aPasricha, R.1 aRavi, V.  uhttps://library.ncl.res.in/content/synthesis-sr05ba05nb2o6-urea-method-001462nas a2200241   4500008004100000022001400041245007900055210006900134260006900203300001200272490000700284520066300291653001300954653002300967653002400990653002101014653001101035100001801046700001701064700002101081700001301102856010501115       2006                        eng d  a0254-058400aCo-precipitation technique for the preparation of ferroelectric BaBi2Ta2O90 aCoprecipitation technique for the preparation of ferroelectric B  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAUG  a344-3460 v983 a<p>A simple co-precipitation technique had been successfully applied for the preparation of pure ultrafine single phase BaBi2Ta2O9 (BBT). Ammonium hydroxide and ammonium oxalate were used to precipitate Ba2+, Bi3+ and Ta5+ cations simultaneously. No pyrochlore phase was found while heating powder at 800 degrees C and pure BaBi2Ta2O9 phase was found to be formed by X-ray diffraction. Particle size and morphology was studied by transmission electron spectroscopy (TEM). The room temperature dielectric constant at 1 kHz is 350. The ferroelectric hysteresis loop parameters of these samples were also studied. (c) 2005 Elsevier B.V. All rights reserved.</p>10aCeramics10aChemical synthesis10aelectronic material10aferroelectricity10aOxides1 aDhage, S., R.1 aPasricha, R.1 aMurugan, Vadivel1 aRavi, V.  uhttps://library.ncl.res.in/content/co-precipitation-technique-preparation-ferroelectric-babi2ta2o9-0