Cationic Ordering, Solid Solution Domain, and Diffuse Reflectance in Fe2WO6 Polymorphs

doi:10.1021/acs.jpcc.1c08314

Cationic Ordering, Solid Solution Domain, and Diffuse Reflectance in Fe2WO6 Polymorphs

2021-11-11

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Bénédicte Vertruyen *

DOI：10.1021/acs.jpcc.1c08314

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Single phases of the alpha, beta, and gamma polymorphs of the Fe2WO6 iron tungsten oxide were obtained through an aqueous solution route based on the combustion and heat treatment of a spray-dried precursor powder. Syntheses with Fe/W ratios not equal 2 identified a domain of solid solutions consistent with a Fe2-2xW1+x square O-x(6) scenario (x up to similar to 0.025) for the defect chemistry in the temperature range around 850 degrees C. The crystallographic characterizations revealed a random cationic distribution in an alpha-PbO2-type cell for the low-temperature polymorph (alpha) and pointed to a reconstructive mechanism for the formation of polymorph beta. A comparison of diffuse reflectance spectra confirmed the visual observation of minor color differences between the polymorphs by revealing small shifts of the absorption threshold; the Kubelka-Munk function and Tauc plots were used for comparison of the polymorphs and discussion of the results with respect to relevant literature.

Keywords:

HEMATITE ALPHA-FE2O3

MAGNETIC-STRUCTURE

IRON TUNGSTATE

OXIDES

TRANSPORT

ALPHA

GAMMA-FE2WO6

PHASES

BETA

EPR

Cationic Ordering, Solid Solution Domain, and Diffuse Reflectance in Fe2WO6 Polymorphs

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