Publicaciones 2011-2020

@article{RN206,
title = {Magnetic Properties and Crystal Structure of Solid-Solution Cu2mnxfe1-Xsns4 Chalcogenides with Stannite-Type Structure},
author = { F. Lopez-Vergara and A. Gald\'{a}mez and V. Manriquez and P. Barahona and O. Pena},
url = {/brokenurl#<Go to ISI>://WOS:000335983000008},
doi = {10.1002/pssb.201350038},
issn = {0370-1972},
year = {2014},
date = {2014-01-01},
journal = {Physica Status Solidi B-Basic Solid State Physics},
volume = {251},
number = {5},
pages = {958-964},
publisher = {2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
abstract = {New solid solutions Cu2MnxFe1-xSnS4 were prepared by direct combination of the corresponding elements at 850 degrees C. The crystal structure of Cu2Mn0.4Fe0.6SnS4 was determined by single-crystal X-ray diffraction. This phase is described in the space group I (4) over bar 2m where each cation is tetrahedrally coordinated to four sulfur anions in a sphalerite-like arrangement. The XRD patterns of the solid solutions Cu2MnxFe1-xSnS4 were fully indexed in the space group I (4) over bar 2m and the values of the cell parameter for all phases obey the usual linear Vegard behavior. A progressive evolution of the magnetic moment in the paramagnetic state is observed when increasing the content of manganese. The negative values of the Curie-Weiss constant, indicate an antiferromagnetic (AF) behavior with AF interactions, weaker by more than one order of magnitude compared to other diluted magnetic semiconductors (DMSs) with zinc-blende or wurzite crystal structure., [GRAPHICS],},
keywords = {chalcogenides, crystal cu2fesns4, kesterite, magnetic model properties, semiconductors, structure, tetrahedra volumes},
pubstate = {published},
tppubtype = {article}
}

@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}
}

@article{RN147,
title = {Cu2mn1-Xcoxsns4: Novel Kesterite Type Solid Solutions},
author = { F. Lopez-Vergara and A. Gald\'{a}mez and V. Manriquez and P. Barahona and O. Pena},
url = {/brokenurl#<Go to ISI>://WOS:000314320800056},
doi = {10.1016/j.jssc.2012.10.026},
issn = {0022-4596},
year = {2013},
date = {2013-01-01},
journal = {Journal of Solid State Chemistry},
volume = {198},
pages = {386-391},
publisher = {2012 Published by Elsevier Inc.},
abstract = {A new family of Cu2Mn1-xCoxSnS4 chalcogenides has been synthesized by conventional solid-state reactions at 850 degrees C. The reactions products were characterized by powder X-ray diffraction (XRD), energy-dispersive X-ray analysis (SEM-EDS), Raman spectroscopy and magnetic susceptibility. The crystal structures of two members of the solid solution series Cu2Mn0.4Co0.6SnS4 and Cu2Mn0.2Co0.8SnS4 have been determined by single-crystal X-ray diffraction. Both phases crystallize in the tetragonal kesterite-type structure (space group I (4) over bar). The distortions of the tetrahedral volume of Cu2Mn0.4 Co0.6SnS4 and Cu2Mn0.2Co0.8SnS4 were calculated and compared with the corresponding differences in the Cu2MnSnS4 (stannite-type) end-member. The compounds show nearly the same Raman spectral features. Temperature-dependent magnetization measurements (ZFC/FC) and high-temperature susceptibility indicate that these solid solutions are antiferromagnetic.},
keywords = {alloys, chalcogenide, chalcogenides, crystal crystal-structures, gap, kesterite, mixed-crystals, series, solar-cells, solution stannite, structure, synthesis, tetrahedra volumes, zn},
pubstate = {published},
tppubtype = {article}
}

@article{RN90,
title = {Intercalation and Electrical Behavior of Taxmo1-Xs2 (X > 0.5) Layered Mixed Disulfides},
author = { N. Lara and P. Aranda and A.I. Ruiz and V. Manriquez and E. Ruiz-Hitzky},
url = {/brokenurl#<Go to ISI>://WOS:000302461200007},
doi = {10.1590/S0103-50532012000300007},
issn = {0103-5053},
year = {2012},
date = {2012-01-01},
journal = {Journal of the Brazilian Chemical Society},
volume = {23},
number = {3},
pages = {415-+},
abstract = {This work reports a systematic study of the structural and electrical behavior of three ternary phases of the TaxMo1-xS2 system (x = 0.55, 0.75 and 0.90) and their intercalation compounds resulting from both chemical and electrochemical lithium insertions, as well as from pyridine and poly(ethylene oxide) intercalations. The three ternary phases were prepared by direct reaction of their constituting elements, without any other additive, at 900 degrees C in inert atmosphere. The resulting compounds were characterized by means of X-ray powder diffractometry (XRD), thermogravimetric and differential thermal (TGA/DTA) analyses, energy dispersive X-ray fluorescence (EDX) and field emission-scanning electron microscopy (FE-SEM). The electrical conductivity of the different products was measured in the 1.5-300 K temperature range using the conventional four probe van der Pauw method in the presence of a 9 T magnetic field in order to verify the occurrence of magnetoresistivity phenomena.},
keywords = {chalcogenides, complexes, conducting conductivity, dichalcogenides, encapsulation, intercalation, lithium molybdenum-disulfide, mos2, nanocomposites, peo, polymers, pyridine, solids sulfides, transition-metal},
pubstate = {published},
tppubtype = {article}
}