Preparation of Nb-Substituted Titanates by a Novel Sol-Gel Assisted Solid State Reaction

Haiyan Song, Anja O. Sjaastad, Ørnulv B. Vistad, Tao Gao, Poul Norby

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Single-phase layered Nb-substituted titanates, Na2Ti3-xNbxO7 (x = 0-0.06) and Cs0.7Ti1.8-xNbxO4 (x = 0-0.03), were for the first time synthesized by a. novel sol-gel assisted solid state reaction (SASSR) route. Conventional solid state reactions as well as sol-gel synthesis did not succeed in producing phase pure Nb-substituted titanates. In the SASSR synthesis route we combine the advantages of traditional sol-gel technique (i.e., homogeneous products formed at low temperatures) and solid state reaction (i.e., formation of stable, crystalline phases) for preparing single-phase niobium-substituted layered titanates. The obtained products were characterized by X-ray powder diffraction, scanning electron microscopy, inductively coupled plasma-atomic emission spectrometry, Raman spectroscopy, and thermogravimetric analysis. Results indicate that the Ti(IV) in the host layer of the samples could be partially replaced by Nb(V) without structural deterioration. After proton-exchange, more water molecules were intercalated into the interlayer of H0.7Ti1.8-xNbxO4 center dot nH(2)O with increasing niobium content, whereas the intedayer distance of H2Ti3-xNbxO7 (x = 0-0.06) was unchanged.
Original languageEnglish
JournalInorganic Chemistry
Volume48
Issue number14
Pages (from-to)6952-6959
ISSN0020-1669
DOIs
Publication statusPublished - 2009
Externally publishedYes

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