Effects of impurities on the hydrothermal reactions of alumina /
Shuitiro Ono [and 3 others].
Description
- Language(s)
-
English
- Published
-
L.G. Hanscom Field, Bedford, Massachusetts : Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, 1970.
- Summary
-
Corundum (Al2O3) was obtained from boehmite (AlOOH) under hydrothermal conditions at temperatures above 400C. The grain size of the crystals with definite habits was 10 to 100 microns. The effects of impurity on the crystallization process of corundum were investigated. It was found that the reaction rate, crystal size and habit, and incorporation of added ions were strongly influenced by temperature change, pH change, and addition of impurities into the solution. These observed data were explained as the results of impurity effects on the solvent structure, solution structure, solubility, diffusion process, nucleation process, and growth process. Habit modification of corundum by adding iron-group ions as sulfate, nitrate, chloride, hydroxide or oxide was determined. Copper ion is not solid-soluble in corundum if sulfate ion coexists; it is solid-soluble substitutionally as Cu(3+) in six coordinated sites if it is added as nitrate, oxide or hydroxide.
- Note
-
Translation supported by the Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force (L.G. Hanscom Field, Mass.), and translated by the Oriental Science Research Library of Emmanuel College, Boston, Massachusetts, under Contract F-19628-68-C-0251.
Translated from Ceramic Association of Japan: Journal (Yogyo Kyokai-Shi), v. 76, n. 7, pp. 207-218, 1968.
Other authors listed on title page: Goro Yamaguchi, Hiroaki Yanagida, Tadao Shimizu.
AFCRL Research Library.
AD0705538 (from http://www.dtic.mil).
"March 1970."
- Physical Description
-
vi, 28 pages :
illustrations ;
28 cm.
Viewability
| Item Link |
Original Source |
|
Full view
|
Technical Report Archive & Image Library
|