title: Effects of Fuel to Synthesis of CaTiO3 by Solution Combustion Synthesis for High-Level Nuclear Waste Ceramics.
abstract: A solution combustion process for the synthesis of perovskite (CaTiO3) powders is described. Perovskite is one of the crystalline host matrics for the disposal of high-level radioactive wastes (HLW) because it immobilizes Sr and Lns elements by forming solid solutions. Solution combustion synthesis, which is a self-sustaining oxi-reduction reaction between nitrate and organic fuel, the exothermic reaction, and the heat evolved convert the precursors into their corresponding oxide products above 1100 degrees C in air. To investigate the effects of amino acid on the combustion reaction, various types of fuels were used; a glycine, amine and carboxylic ligand mixture. Sr, La and Gd-nitrate with equivalent amounts of up to 20% of CaTiO3 were mixed with Ca and Ti nitrate and amino acid. X-ray diffraction analysis, SEM and TEM were conducted to confirm the formed phases and morphologies. While powders with an uncontrolled shape are obtained through a general oxide-route process, Ca(Sr, Lns)TiO3 powders with micro-sized soft agglomerates consisting of nano-sized primary particles can be prepared using this method.
authors.forename: Choong-Hwan
authors.initials: CH
authors.lastname: Jung
authors.forename: Yeon-Ku
authors.initials: YK
authors.lastname: Kim
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Han
authors.forename: Sang-Jin
authors.initials: SJ
authors.lastname: Lee
mesh_terms: D017610:Calcium Compounds / Q000138:chemical synthesis / Q000737:chemistry; D002516:Ceramics / Q000138:chemical synthesis / Q000737:chemistry; D010087:Oxides / Q000138:chemical synthesis / Q000737:chemistry; D011850:Radioactive Waste; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D011850:Radioactive Waste; C059910:perovskite; D014025:Titanium; D013324:Strontium