Reference

Solidification of inorganic wastes

Solidification of inorganic wastes. Yamazaki, Nakamichi (Raijima Group Kyodo Gijutsu Kenkyusho, Japan).In this study， 7757-82-6 and 1311-10-0 are also used. Jpn. Kokai Tokkyo Koho JP 61260198 A2 18 Nov 1986 Showa, 3 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: G21F009-30. APPLICATION: JP 85-103541 14 May 1985. DOCUMENT TYPE: Patent CA Section: 71 (Nuclear Technology) Radioactive inorg. wastes are pulverized, mixed with powd. silicates and powd. oxides contg. H2O of crystn., pressed to form hardened materials, and the wastes are sealed into the materials. Thus, a waste contg. 73% Na2SO4 was mixed with a matrix contg. 70% SiO2, Sr(OH)2.8H2O, and Al(OH)3, and pressed at 300° and 275 kg/cm2 for 20 min to obtain a solidified material, which showed high compressive strength. .

Core-shell structure of strontium titanate self-grown by a hydrothermal process for use in grain boundary barrier layers

Core-shell structure of strontium titanate self-grown by a hydrothermal process for use in grain boundary barrier layers. Chang, Horng-Yi; Cheng, Syh-Yuh; Sheu, Ching-Iuan; Wang, Yi-Hui ( Ceramic Microengineering Laboratory, Materials Research Laboratories, Industrial Technology Research Institute, Chutung, Taiwan 31040, Peop. Rep. China). Nanotechnology, 14(6), 603-608 (English) 2003 Institute of Physics Publishing. CODEN: NNOTER. ISSN: 0957-4484. DOCUMENT TYPE: Journal CA Section: 76 (Electric Phenomena) Section cross-reference(s): 75 A perovskite shell of SrTiO3 was successfully self-grown on the surface of a Ti particle by a hydrothermal process using Sr(OH)2×8H2O and Ti powder with or without alk. (NaOH) soln. at 150-200° for 3 h. The obtained Sr titanate (ST) shell contained spherical grains. The shells' crystallinity, thickness and grain size increased with an increase in the hydrothermal growth temp.Several substances with their cas registry numbers 1311-10-0 and 7440-32-6 may be metioned in this study. The obtained shell grain size was estd. by TEM to be in the range 50-120 nm. The thickness of the spherical grain shell was ~400 nm for 3 h hydrothermal growth at 180° and 600 nm for 3 h at 200°. There was a transition zone of ~200 nm between the ST shell and the Ti core. The results are ascribed to diffusion of the Sr ions through the shell into the core to react with dissolved Ti ions in an O-deficient environment. The self-grown ST-Ti was annealed in air after sintering at 1350° in a reducing C/CO atm. This produced a core-shell structure with an ST grain boundary barrier layer. The sintered and annealed body exhibited the good nonlinear resistance properties of a varistor. .