2014 |
Galdámez, A; Lopez-Vergara, F; Cid, N V; Manriquez, V; Avila, R E Copper Substitutions in Synthetic Miargyrite Alpha-Agsbs2 Mineral: Synthesis, Characterization and Dielectrical Properties Artículo de revista Materials Chemistry and Physics, 143 (3), pp. 1372-1377, 2014, ISSN: 0254-0584. Resumen | Enlaces | BibTeX | Etiquetas: agsbs2, chalcogenides, chemical conductivity, dielectric diffraction, direct-band-gap, electrical optical-properties, powder properties, spectra, synthesis, tl @article{RN204, title = {Copper Substitutions in Synthetic Miargyrite Alpha-Agsbs2 Mineral: Synthesis, Characterization and Dielectrical Properties}, author = {A. Gald\'{a}mez and F. Lopez-Vergara and N.V. Cid and V. Manriquez and R.E. Avila}, url = {/brokenurl#<Go to ISI>://WOS:000331347500066}, doi = {10.1016/j.matchemphys.2013.11.048}, issn = {0254-0584}, year = {2014}, date = {2014-01-01}, journal = {Materials Chemistry and Physics}, volume = {143}, number = {3}, pages = {1372-1377}, publisher = {2013 Elsevier B.V.}, abstract = {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 alpha-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.}, keywords = {agsbs2, chalcogenides, chemical conductivity, dielectric diffraction, direct-band-gap, electrical optical-properties, powder properties, spectra, synthesis, tl}, pubstate = {published}, tppubtype = {article} } 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 alpha-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. |
2014 |
Copper Substitutions in Synthetic Miargyrite Alpha-Agsbs2 Mineral: Synthesis, Characterization and Dielectrical Properties Artículo de revista Materials Chemistry and Physics, 143 (3), pp. 1372-1377, 2014, ISSN: 0254-0584. |