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In situ high-temperature X-ray diffraction characterization of silver sulfide, Ag2S

Published online by Cambridge University Press:  05 March 2012

Thomas Blanton ,
Scott Misture ,
Narasimharao Dontula  and
Swavek Zdzieszynski
Thomas Blanton*
Affiliation:
Eastman Kodak Company, Rochester, New York 14650-2106
Scott Misture
Affiliation:
Alfred University, Alfred, New York 14802
Narasimharao Dontula
Affiliation:
Eastman Kodak Company, Rochester, New York 14650-2106
Swavek Zdzieszynski
Affiliation:
Alfred University, Alfred, New York 14802
*
a)Author to whom correspondence should be addressed. Electronic mail: thomas.blanton@kodak.com
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Abstract

Silver sulfide, Ag2S, is most commonly known as the tarnish that forms on silver surfaces due to the exposure of silver to hydrogen sulfide. The mineral acanthite is a monoclinic crystalline form of Ag2S that is stable to 176°C. Upon heating above 176°C, there is a phase conversion to a body-centered cubic (bcc) form referred to as argentite. Further heating above 586°C results in conversion of the bcc phase to a face-centered cubic (fcc) phase polymorph. Both high-temperature cubic phases are solid-state silver ion conductors. In situ high-temperature X-ray diffraction was used to better understand the polymorphs of Ag2S on heating. The existing powder diffraction file (PDF) entries for the high-temperature fcc polymorph are of questionable reliability, prompting a full Rietveld structure refinement of the bcc and fcc polymorphs. Rietveld analysis was useful to show that the silver atoms are largely disordered and can only be described by unreasonably large isotropic displacement parameters or split site models.

Keywords

ion conductorpolymorphsilver sulfideX-ray diffraction
Type
Technical Articles
Information
Powder Diffraction , Volume 26 , Special Issue 2 , June 2011 , pp. 114 - 118
Copyright
Copyright © Cambridge University Press 2011

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