02296nas a2200289   4500008004100000022001400041245011600055210006900171260006900240300001200309490000800321520129400329653001301623653002301636653001101659653001401670100001901684700001901703700002801722700001801750700002501768700001901793700002101812700002301833700001901856856013101875       2010                        eng d  a0254-058400aSimple chemical co-precipitation/calcination route for the synthesis of simulated synroc-B and synroc-C powders0 aSimple chemical coprecipitationcalcination route for the synthes  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcOCT  a695-6990 v1233 a<p>A simple chemical co-precipitation/calcination route was developed for the synthesis of simulated synroc-B and synroc-C powders using mostly nitrate salts as starting chemicals and 20% ammonia solution as precipitant. In this route, a mixed solution containing Al-nitrate, Ca-nitrate, Ba-nitrate, zirconyl nitrate and titanyl nitrate in the molar proportion required for synroc-B is added to dilute ammonia solution to precipitate these cations in the form of their hydroxides at room temperature by maintaining pH approximate to 10.5 during precipitation. Formation of a major fluorite phase with minor amounts of anatase, rutile and hollandite phases is observed in the powder obtained after calcination in air at 750 degrees C. Multiphase crystalline synroc-B matrix containing hollandite, perovskite, zirconolite, and rutile phases is obtained after sintering the heat treated powder in the form of pellets at 1230 degrees C for 4h in air. Similarly, pure synroc-C phases with 14 and 20% simulated waste loadings were synthesized following the same synthesis protocol. These pre-treated powders with a high surface area of similar to 25 m(2) g(-1) gave sintered ceramics having density of similar to 90% for 14 and 20% waste loadings. (C) 2010 Elsevier B.V. All rights reserved.</p>10aCeramics10aChemical synthesis10aOxides10aSintering1 aPotdar, H., S.1 aVijayanand, S.1 aMohaideen, Kamal, Khaja1 aPatil, K., R.1 aJoy, Pattayil, Alias1 aMadhavan, Raja1 aKutty, K., V. G.1 aAmbashta, Ritu, D.1 aWattal, P., K.  uhttps://library.ncl.res.in/content/simple-chemical-co-precipitationcalcination-route-synthesis-simulated-synroc-b-and-synroc-0