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Conversion of SiO 2 Diatom Frustules to BaTiO 3 and SrTiO 3
Author(s) -
Dudley Shan,
Kalem Tugba,
Akinc Mufit
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01091.x
Subject(s) - anatase , materials science , nanocrystalline material , perovskite (structure) , chemical engineering , ceramic , phase (matter) , mineralogy , template , diatom , nanotechnology , catalysis , chemistry , composite material , geology , photocatalysis , organic chemistry , oceanography , engineering
Diatom frustules were used as bio‐templates to synthesize functional ceramics via solid–gas displacement reactions. Silica‐based frustules were exposed to TiF 4 at 330°C to form TiOF 2 , which was later converted to TiO 2 (anatase) by heat treatment in air at 600°C. The TiO 2 frustules were then exposed to molten Ba(OH) 2 or Sr(OH) 2 to form BaTiO 3 or SrTiO 3 , respectively. In both cases, near‐complete conversion was achieved while retaining the morphology of the original silica frustules. BaTiO 3 and SrTiO 3 frustules exhibit nearly phase pure, nanocrystalline perovskite structure.