Stoichiometry Control and Phase Selection in Hydrothermally Derived BaxSr1-xTiO3 Powders
BaxSr1‐xTiO3 (BST) powders were processed at temperatures <100°C by reacting nanosized TiO2 powders in alkaline, aqueous solutions of BaCl2, SrCl2, and NaOH. The effects of processing variables (NaOH concentration, time, temperature, and the ratios of barium, strontium, and titanium initially in...
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Published in | Journal of the American Ceramic Society Vol. 82; no. 7; pp. 1665 - 1675 |
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Main Authors | , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Westerville, Ohio
American Ceramics Society
01.07.1999
Blackwell |
Subjects | |
Online Access | Get full text |
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Summary: | BaxSr1‐xTiO3 (BST) powders were processed at temperatures <100°C by reacting nanosized TiO2 powders in alkaline, aqueous solutions of BaCl2, SrCl2, and NaOH. The effects of processing variables (NaOH concentration, time, temperature, and the ratios of barium, strontium, and titanium initially in solution) on the resultant BST powder stoichiometry and solid solubility were examined. In all cases, strontium was more readily incorporated into the BST powders than barium, and the extent varied systematically with the processing variables. BST powders that were processed in solutions with a large initial excess of barium and strontium, relative to titanium, consisted of a single‐phase solid solution. In contrast, BST powders that were processed in solutions with a small initial excess of barium and strontium, relative to titanium, contained a biphasic solid solution which corresponded to separate barium‐rich and strontium‐rich phases. |
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Bibliography: | ArticleID:JACE1665 istex:8771DF79EDA90C740DB665C4ABFACEED1351FDF8 ark:/67375/WNG-RFBFCQFF-3 Member, American Ceramic Society. R. E. Riman—contributing editor Supported by the National Science Foundation, under Grant No. DMR‐9623744. Presented at the 99th Annual Meeting of the American Ceramic Society, Cincinnati, OH, May 4–7, 1997 (Paper No. SXI‐002‐97). |
ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/j.1151-2916.1999.tb01984.x |