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

Abstract

Hollandite is a class of metal oxide material with the general formula A 2B 8O 16. 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 (Ba xAl 2xTi 8–2xO 16–δ; x = 1.2; and Ba xAl xFe xTi 8–2xO 16–δ, Ba xFe 2xTi 8–2xO 16–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 coprecipitationmore » method is used, with little change to the local and long-range structures being detected.« less

Authors:
 [1]; ORCiD logo [1]
  1. Univ. of Saskatchewan, Saskatoon, SK (Canada)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
Natural Sciences and Engineering Research Council of Canada (NSERC); Government of Saskatchewan; National Research Council Canada (NRC); Canadian Institutes of Health Research (CIHR); Western Economic Diversification Canada; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1484809
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 57; Journal Issue: 22; Journal ID: ISSN 0020-1669
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; X-ray absorption near edge spectroscopy; Physical and chemical processes; Ceramics; Materials; Annealing (metallurgy)

Citation Formats

Ebinumoliseh, Ifeoma, and Grosvenor, Andrew P. Effect of Synthetic Method and Annealing Temperature on the Structure of Hollandite-Type Oxides. United States: N. p., 2018. Web. doi:10.1021/acs.inorgchem.8b02464.
Ebinumoliseh, Ifeoma, & Grosvenor, Andrew P. Effect of Synthetic Method and Annealing Temperature on the Structure of Hollandite-Type Oxides. United States. doi:10.1021/acs.inorgchem.8b02464.
Ebinumoliseh, Ifeoma, and Grosvenor, Andrew P. Wed . "Effect of Synthetic Method and Annealing Temperature on the Structure of Hollandite-Type Oxides". United States. doi:10.1021/acs.inorgchem.8b02464. https://www.osti.gov/servlets/purl/1484809.
@article{osti_1484809,
title = {Effect of Synthetic Method and Annealing Temperature on the Structure of Hollandite-Type Oxides},
author = {Ebinumoliseh, Ifeoma and Grosvenor, Andrew P.},
abstractNote = {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.},
doi = {10.1021/acs.inorgchem.8b02464},
journal = {Inorganic Chemistry},
issn = {0020-1669},
number = 22,
volume = 57,
place = {United States},
year = {2018},
month = {10}
}

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Cited by: 2 works
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