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Title: Effect of Synthetic Method and Annealing Temperature on the Structure of Hollandite-Type Oxides

Journal Article · · Inorganic Chemistry

Hollandite is a class of metal oxide material with the general formula A2B8O16. Several methods have been used in the synthesis of this type of metal oxide, and the synthetic methods reported have typically employed high annealing temperatures between 1200 and 1300 °C. Appropriate synthetic methods must be employed to successfully synthesize these hollandite-type oxides at lower annealing temperatures. Hollandite compounds have been synthesized using ceramic (high annealing temperature only) and coprecipitation (high and low annealing temperatures) methods. Annealing temperatures ranging from 1200 to 700 °C have been employed in the thermal treatment process. In this work, powder X-ray diffraction and X-ray absorption near-edge spectroscopy (XANES) were conducted on hollandite-type oxides (BaxAl2xTi8–2xO16–δ; x = 1.2; and BaxAlxFexTi8–2xO16–δ, BaxFe2xTi8–2xO16–δ; x = 1.16). Structural comparisons between materials annealed in the temperature range from 1200 to 800 °C were made, and an examination of the XANES spectra and powder X-ray diffraction patterns has provided confirmation of the absence of significant structural changes in these hollandite materials. This study has shown that hollandite-type materials can be formed using annealing temperatures as low as 700–800 °C when a coprecipitation method is used, with little change to the local and long-range structures being detected.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Canadian Institutes of Health Research (CIHR); Government of Saskatchewan; National Research Council Canada (NRC); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Western Economic Diversification Canada
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1484809
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 22 Vol. 57; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH

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