01524nas a2200193   4500008004100000022001400041245007300055210006900128260006900197300001200266490000800278520083800286653002401124653003301148653001801181100001501199700001201214856010401226       2005                        eng d  a0921-510700aPreparation of fine MgTa2O6 and Mg4Ta2O9 powders by chemical methods0 aPreparation of fine MgTa2O6 and Mg4Ta2O9 powders by chemical met  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAY  a189-1910 v1193 a<p>Two different chemical methods are applied to prepare MgTa2O6 (MT2) and Mg4Ta2O9 (M4T2) powders. A gel was formed when a aqueous solution of Mg(NO3)(2), TAF(5) and citric acid in stoichiometric ratio is heated on a water bath. This gel on decomposition at 750 degrees C produced the fine crystallites of ternary oxide, M4T2. A simple co-precipitation technique had been successfully applied for the preparation of pure ultrafine single phase MT2. Ammonium hydroxide was used to precipitate Mg2+ and Ta5+ cations as hydroxides simultaneously. This precursor on heating at 750 degrees produces MT2 powders. The phase contents and lattice parameters were studied by the powder X-ray diffraction (XRD). Particle size and morphology was studied by transmission electron microscopy (TEM). (c) 2005 Elsevier B.V. All rights reserved.</p>10aElectron microscopy10apowders-chemical preparation10aX-ray methods1 aNavale, SC1 aRavi, V  uhttps://library.ncl.res.in/content/preparation-fine-mgta2o6-and-mg4ta2o9-powders-chemical-methods-0