01196nas 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-001328nas a2200241   4500008004100000022001400041245004900055210004700104260009900151300001200250490000700262520058100269653000900850653002500859653002400884653001200908653001800920100001800938700002000956700001900976700001300995856007801008       2005                        eng d  a0272-884200aSynthesis of Ce0.75Zr0.25O2 at 100 degrees C0 aSynthesis of Ce075Zr025O2 at 100 degrees C  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN  a211-2130 v313 a<p>A simple gel to crystal conversion route has been used for the preparation of Ce0.75Zr0.25O2 phase at 80-100degreesC under refluxing conditions. Freshly prepared metal hydroxides gel from cerium and zirconium salt solution is allowed to crystallize under refluxing and stirring conditions for 4-10 h. Formation of nano crystallites of Ce0.75Zr0.25O2 is confirmed by X-ray diffraction (XRD). Transmission electron microscopy (TEM) investigations revealed the average particle size of these powders to be 5 nm. (C) 2004 Elsevier Ltd and Techna S.r.l. All rights reserved.</p>10aCeO210achemical preparation10aElectron microscopy10apowders10aX-ray methods1 aDhage, S., R.1 aGaikwad, S., R.1 aMuthukumar, P.1 aRavi, V.  uhttps://library.ncl.res.in/content/synthesis-ce075zr025o2-100-degrees-c-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-001457nas a2200253   4500008004100000022001400041245005900055210005900114260009900173300001200272490000700284520065200291653002500943653001300968653001600981653001200997653001801009100001901027700001801046700001501064700001801079700001301097856009301110       2008                        eng d  a0272-884200aNovel hydroxide precursors to prepare NaNbO3 and KNbO30 aNovel hydroxide precursors to prepare NaNbO3 and KNbO3  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcAPR  a671-6730 v343 a<p>Firstly, fresh niobium, hydroxide was precipitated from NbF5 solution using an aqueous ammonium hydroxide under basic conditions. Then a simple procedure of mixing potassium (or sodium) and niobium hydroxides together and heating at a low temperature (&lt;400 degrees C) produced KNbO3 (KN) or NaNbO3 (NN) powders. This is the lowest temperature so far reported for the formation of these phases. The phase content and lattice parameters are determined by X-ray diffraction (XRD). The average particle size and morphology were studied by scanning electron microscopy (SEM). (c) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.</p>10achemical preparation10aniobates10aPerovskites10apowders10aX-ray methods1 aMuthurajan, H.1 aKumar, H., H.1 aSamuel, V.1 aGupta, U., N.1 aRavi, V.  uhttps://library.ncl.res.in/content/novel-hydroxide-precursors-prepare-nanbo3-and-knbo3-0