Thermal Treatment of Titanate Derivatives Synthesized by Ion‐Exchange Reaction

Abstract

TiO 2 fibers were formed by thermal treatment of layered H 2 Ti 4 O 9 (hydrous titanium dioxide) and KHTi 4 O 9 synthesized by ion‐exchange reactions. The calcination of the former at 900° and 1050°C for 3 h yielded TiO 2 fibers with anatase and rutile phases, whose length and diameter were 15–20 and 2–5 μm and 10–15 and 3–5 μm, respectively. The thermal treatment of the latter at temperatures of 250° to 500°C yielded pure K 2 Ti 8 O 17 , which tended to decompose to K 2 Ti 6 O 13 and TiO 2 at temperatures >600°C. At 1050°C, K 2 Ti 6 O 13 phase was formed with rutile TiO 2 fibers, whose length and diameter were 10–20 and 1–3 μm, respectively.