Copper substitutions in synthetic miargyrite α-AgSbS2 mineral: Synthesis, characterization and dielectrical properties

Autor:	N. Veloso Cid, F. López-Vergara, Antonio Galdámez, Victor Manriquez, R.E. Avila
Rok vydání:	2014
Předmět:	Permittivity Materials science Mineralogy chemistry.chemical_element Dielectric Condensed Matter Physics Ferroelectricity Copper symbols.namesake Crystallography chemistry symbols General Materials Science Grain boundary Isostructural Raman spectroscopy Powder diffraction
Zdroj:	MATERIALS CHEMISTRY AND PHYSICS Artículos CONICYT CONICYT Chile instacron:CONICYT
ISSN:	0254-0584
DOI:	10.1016/j.matchemphys.2013.11.048
Popis:	The nominal compositions Ag0.8Cu0.2SbS2 and Ag0.7Cu0.3SbS2 have been synthesized by conventional ceramic solid-state reaction at high temperature. X-ray diffraction (XRD) and scanning electron microscopy chemical analysis (SEM-EDAX) revealed single phases, isostructural to the natural miargyrite α-AgSbS2 mineral. Examination of the lattice parameters shows a decrease in the cell volume with increasing copper substitutions. The Raman analysis displays absorptions which may be assigned to the Sb–S stretching vibrations of the SbS3 pyramids. The impedance-frequency analysis showed grain boundary and electrode interface contributions in non-Debye type relaxation, following Jonscher's universal power law. The giant permittivity response is attributed to extrinsic effects without evidence of a ferroelectric transition. Summerfield scaling, leading to the superposition of impedance analysis, implies that the relaxation is thermally activated, without introducing more than one underlying transport mechanism.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e12865f47a577d2e1cabe3a8e6e71aa https://doi.org/10.1016/j.matchemphys.2013.11.048 Zobrazit plný text záznamu Full Text from ScienceDirect