01433nas a2200241   4500008004100000022001400041245004900055210004900104260006900153300001200222490000800234520072900242653001200971653001300983653002400996653001801020653001101038100001701049700001401066700001601080700001201096856008301108       2005                        eng d  a0921-510700aCoprecipitation technique to prepare BaNb2O60 aCoprecipitation technique to prepare BaNb2O6  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR  a169-1710 v1173 a<p>A mixture of ammonium oxalate and ammonium hydroxide was used to coprecipitate barium and niobium ions as barium oxalate and niobium hydroxide under basic conditions. This precursor on calcination at 750degreesC yielded BaNb2O6 ceramics. This is a much lower temperature as compared to that prepared by traditional solid-state method (1000degreesC), as reported for the formation of BaNb2O6. 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 1100. The ferroelectric hysteresis loop parameters of these samples were also studied. (C) 2004 Elsevier B.V. All rights reserved.</p>10aAmmonia10aCeramics10aElectron microscopy10aniobium oxide10aOxides1 aNatarajan, N1 aSamuel, V1 aPasricha, R1 aRavi, V  uhttps://library.ncl.res.in/content/coprecipitation-technique-prepare-banb2o6-001583nas a2200217   4500008004100000022001400041245007900055210006900134260010000203300001200303490000700315520077500322653002601097653002401123653002901147653003501176100002001211700001601231700001201247856010601259       2005                        eng d  a0272-884200aPreparation of nanocrystalline ferroelectric CaBi2Ta2O9 by the urea method0 aPreparation of nanocrystalline ferroelectric CaBi2Ta2O9 by the u  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN   a773-7750 v313 a<p>A precipitate was formed when a aqueous solution of CaCl2, BiCl3, TaF5 and urea in stoichiometric ratio (total metal cations to urea ratio is 5) is heated on a water bath. This precipitate on decomposition at 600 degrees C yielded the nanocrystallites of ternary oxide CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (P-r) and coercive field (E-C) were also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 70 nm. The room temperature dielectric constant was found to be 110. (c) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.</p>10adielectric properties10aElectron microscopy10aferroelectric properties10apowders : chemical preparation1 aGaikwad, S., P.1 aPasricha, R1 aRavi, V  uhttps://library.ncl.res.in/content/preparation-nanocrystalline-ferroelectric-cabi2ta2o9-urea-method-001418nas a2200205   4500008004100000022001400041245008100055210006900136260006900205300001200274490000800286520070600294653001201000653001601012653002401028100002001052700001601072700001201088856011201100       2005                        eng d  a0921-510700aPreparation of nanocrystalline ferroelectric CaBi2TaO9 by citrate gel method0 aPreparation of nanocrystalline ferroelectric CaBi2TaO9 by citrat  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR  a159-1610 v1173 a<p>A gel was formed when an aqueous solution of CaCl2, BiCl3, TaF5 and citric acid in stoichiometric ratio is heated on a water bath. This gel on decomposition at 600degreesC yielded the nano-crystallites of ternary oxide, CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction study (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (P-r) and coercive field (E-C) are also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 40 nm. The room temperature dielectric constant was found to be 90. (C) 2004 Elsevier B.V All rights reserved.</p>10aBismuth10adiffraction10aElectron microscopy1 aGaikwad, S., P.1 aPasricha, R1 aRavi, V  uhttps://library.ncl.res.in/content/preparation-nanocrystalline-ferroelectric-cabi2tao9-citrate-gel-method-001196nas a2200217   4500008004100000022001400041245006500055210006500120260007300185300001400258490000700272520047900279653001600758653002400774653002200798653001200820653002200832100001600854700001200870856009600882       2005                        eng d  a0167-577X00aPreparation of nanocrystalline MgNb2O6 by citrate gel method0 aPreparation of nanocrystalline MgNb2O6 by citrate gel method  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a2146-21480 v593 a<p>A gel was formed when a aqueous solution of Mg(NO3)(2), NbF5 and citric acid in stoichiometric ratio is heated on a water bath. This gel on decomposition at 700 degrees C produced the fine crystallites of ternary oxide, MgNb2O6 (MN). The formation of MN phase and lattice parameters were determined by the powder X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). (c) 2005 Elsevier B.V. All rights reserved.</p>10aCitrate gel10aElectron microscopy10amagnesium niobate10apowders10aX-ray diffraction1 aPasricha, R1 aRavi, V  uhttps://library.ncl.res.in/content/preparation-nanocrystalline-mgnb2o6-citrate-gel-method-001326nas a2200229   4500008004100000022001400041245004000055210004000095260009900135300001200234490000700246520063900253653002500892653002400917653001200941653000900953653001800962100001400980700001600994700001201010856007401022       2005                        eng d  a0272-884200aSynthesis of nanocrystalline rutile0 aSynthesis of nanocrystalline rutile  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN  a555-5570 v313 a<p>Nanocrystalline titanium dioxide (TiO2) in the rutile phase has been obtained by homogeneous precipitation using urea and TiOCl2. A mixture of urea and TiOCl2 is heated on a hot water bath at 65-75 degrees C to precipitate rutile powders. X-ray diffraction (XRD) studies on these oven-dried powders indicated the formation of single-phase rutile. Raman scattering experiments were also performed to confirm the formation of the rutile phase. Transmission electron microscopy (TEM) investigations revealed the average particle size of these powders to be 40 nm. (c) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.</p>10achemical preparation10aElectron microscopy10apowders10aTiO210aX-ray methods1 aSamuel, V1 aPasricha, R1 aRavi, V  uhttps://library.ncl.res.in/content/synthesis-nanocrystalline-rutile-001244nas a2200205   4500008004100000022001400041245005500055210005300110260006900163300001000232490000700242520060800249653001300857653002400870653002100894653001100915100001600926700001200942856008400954       2005                        eng d  a0254-058400aSynthesis of Sr0.5Ba0.5Nb2O6 by citrate gel method0 aSynthesis of Sr05Ba05Nb2O6 by citrate gel method  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcNOV  a34-360 v943 a<p>A gel was formed when an aqueous solution of BaCl2, SrCl2, NbF5 and citric acid in stoichiometric ratio is heated on a water bath. This gel on decomposition at 700 degrees C yielded the nanocrystallites of ternary oxide, Sr0.5Ba0.5Nb2O6 (SBN) as confirmed by X-ray diffraction study (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). The room temperature dielectric constant at I kHz is 1000. The ferroelectric hysteresis loop parameters of these samples were also studied by a home built Sawyer-Tower circuit. (c) 2005 Elsevier B.V. All rights reserved.</p>10aCeramics10aElectron microscopy10aferroelectricity10aOxides1 aPasricha, R1 aRavi, V  uhttps://library.ncl.res.in/content/synthesis-sr05ba05nb2o6-citrate-gel-method-0