Physical Chemistry Chemical Physics, volume 17, issue 32, pages 20495-20501

An in situ high-temperature scanning electron microscopy study of acanthite–argentite phase transformation in nanocrystalline silver sulfide powder

Stanislav I Sadovnikov ¹

Aleksandr I. Gusev ¹

Andrey Rempel ^{1, 2}

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Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russia |

Ural Federal University Named After the First President of Russia B.N. Yeltsin, Ekaterinburg, Russia |

Publication type: Journal Article

Publication date: 2015-07-24

Royal Society of Chemistry (RSC)

Journal: Physical Chemistry Chemical Physics

scimago Q2

SJR: 0.721

CiteScore: 5.5

Impact factor: 2.9

ISSN: 14639076, 14639084

DOI: 10.1039/c5cp02499d

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PubMed ID: 26206668

Physical and Theoretical Chemistry

General Physics and Astronomy

Abstract

For the first time, the α-Ag2S (acanthite)-β-Ag2S (argentite) phase transformation in nanocrystalline and coarse-crystalline powders of silver sulfide has been observed in situ by the scanning electron microscopy method in real-time. The argentite crystals are formed on the surface of acanthite particles as a result of electron-beam heating. According to the differential thermal analysis data, the transformation occurs at a temperature of ∼449-450 K, and the enthalpy of transformation is equal to ∼3.7-3.9 kJ mol(-1). The presence of α-Ag2S (acanthite)-β-Ag2S (argentite) phase transformation is confirmed in situ by high-temperature X-ray diffraction data.

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