Annealing of metamict gadolinite-(Y): X-ray diffraction, Raman, IR, and Mössbauer spectroscopy
Published version
Peer-reviewed
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Repository DOI
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Authors
Salje, Ekhard Karl
Abstract
Radiation induced disorder in gadolinite that led to metamictization with an upper degree of amorphization of 18% was thermally annealed between room temperature and 1273 K. The degree of annealing was calibrated using the anti-symmetric Si–O–Si Raman-active stretching mode near 902 cm−1. Annealing increased with increasing temperature with a rapid critical recrystallization at ca. 943 K. This annealing on a short length scale was then complemented by investigations of long-range ordering seen by X-ray diffraction. The same critical temperature was found, and in addition further increase of long-range order extended to 1073 K. Metamict gadolinite contains only Fe2+ within experimental uncertainty.
Description
Keywords
infrared, metamict gadolinite-(Y), Mossbauer spectroscopy, Raman, X-ray powder diffraction
Journal Title
Zeitschrift fur Kristallographie - Crystalline Materials
Conference Name
Journal ISSN
2196-7105
2196-7105
2196-7105
Volume Title
234
Publisher
Walter de Gruyter
Publisher DOI
Sponsorship
Engineering and Physical Sciences Research Council (EP/P024904/1)
EPSRC