Probable metal–insulator transition in Ag4SSe

[Display omitted] •New phase transition in Ag4SSe was discovered with scanning calorimetry and supported with X-ray powder diffraction.•The thermal effect relates to the anomaly in electrical and thermal conductivity of Ag4SSe.•Similar thermal and electrical effects in K3Cu8S6 are explained with the...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-02, Vol.622, p.236-242
Main Authors: Drebushchak, V.A., Pal’yanova, G.A., Seryotkin, Yu.V., Drebushchak, T.N.
Format: Article
Language:English
Subjects:
Ag4SSe
Calorimetry
DSC
Metal–insulator transition
Superlattice
X-ray diffraction
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Summary:[Display omitted] •New phase transition in Ag4SSe was discovered with scanning calorimetry and supported with X-ray powder diffraction.•The thermal effect relates to the anomaly in electrical and thermal conductivity of Ag4SSe.•Similar thermal and electrical effects in K3Cu8S6 are explained with the metal–insulator transition. New phase transition (285K) in low-temperature monoclinic Ag4SSe was found out below the α–β transition (358K) after the measurements with differential scanning calorimetry. The transition reveals significant hysteresis (over 30K). X-ray powder diffraction shows that the superlattice with doubled a and b parameters of the unit cell exists below the new transition point. The signs of this new phase transition can be found in thermal and electrical conductivity of Ag4SSe published in literature. Elusive phase transition in Ag2Se shows similar properties. The new transition is likely related to the metal–insulator type transition, like K3Cu8S6.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2014.10.065