2014 |
Barahona, P; Galdámez, A; Lopez-Vergara, F; Manriquez, V; Pena, O Synthesis and Magnetic Properties of Chromium-Based Cu(Cr2-Xtix)S-4 Thiospinels and Their Deficient Structures Cu1-Y Rectangle Ycr2-Xtixs4 Obtained by Copper Extraction Artículo de revista Journal of the Chilean Chemical Society, 59 (1), pp. 2294-2298, 2014, ISSN: 0717-9707. Resumen | Enlaces | BibTeX | Etiquetas: copper cr, cuti2s4, cuzr2s4 electrical-properties, extraction, ferrimagnetic intercalation, lithium magnetoresistance, mixed perovskites, spin-glass, thiospinel, valence @article{RN205, title = {Synthesis and Magnetic Properties of Chromium-Based Cu(Cr2-Xtix)S-4 Thiospinels and Their Deficient Structures Cu1-Y Rectangle Ycr2-Xtixs4 Obtained by Copper Extraction}, author = { P. Barahona and A. Gald\'{a}mez and F. Lopez-Vergara and V. Manriquez and O. Pena}, url = {/brokenurl#<Go to ISI>://WOS:000342613000010}, doi = {10.4067/S0717-97072014000100011}, issn = {0717-9707}, year = {2014}, date = {2014-01-01}, journal = {Journal of the Chilean Chemical Society}, volume = {59}, number = {1}, pages = {2294-2298}, abstract = {The crystalline structure of spinels is extremely flexible due to the presence of several sublattices in which the cations can be distributed and localized in different crystallographic sites depending on their sizes, oxidation states or coordination numbers. Cationic substitution and ions- extraction are appropriate tools to change the oxidation state inside the spinel structure, thus substantially modifying the magnetic properties. The spinel sulfide CuCr2S4 is a metallic ferromagnet with T-C=377 K, where Cr is mixed- valence Cr3+/Cr4+, while CuTi2S4 is a Pauli paramagnet, with Ti in a mixed- valence state (singlet ground state for Ti3+; nonmagnetic}, keywords = {copper cr, cuti2s4, cuzr2s4 electrical-properties, extraction, ferrimagnetic intercalation, lithium magnetoresistance, mixed perovskites, spin-glass, thiospinel, valence}, pubstate = {published}, tppubtype = {article} } The crystalline structure of spinels is extremely flexible due to the presence of several sublattices in which the cations can be distributed and localized in different crystallographic sites depending on their sizes, oxidation states or coordination numbers. Cationic substitution and ions- extraction are appropriate tools to change the oxidation state inside the spinel structure, thus substantially modifying the magnetic properties. The spinel sulfide CuCr2S4 is a metallic ferromagnet with T-C=377 K, where Cr is mixed- valence Cr3+/Cr4+, while CuTi2S4 is a Pauli paramagnet, with Ti in a mixed- valence state (singlet ground state for Ti3+; nonmagnetic |
Barahona, P; Galdámez, A; Lopez-Vergara, F; Manriquez, V; Pena, O Crystal Structure and Magnetic Properties of Titanium-Based Cuti2-Xmxs4 and Cucr2-Xtixse4 Chalcospinels Artículo de revista Journal of Solid State Chemistry, 212 , pp. 114-120, 2014, ISSN: 0022-4596. Resumen | Enlaces | BibTeX | Etiquetas: chalcospinel, copper crystal cucr2se4, cuti2s4, electrical-properties, geometry, lithium, magnetic polyhedra, properties, spinel structure, thiospinels, transport-properties @article{RN203, title = {Crystal Structure and Magnetic Properties of Titanium-Based Cuti2-Xmxs4 and Cucr2-Xtixse4 Chalcospinels}, author = { P. Barahona and A. Gald\'{a}mez and F. Lopez-Vergara and V. Manriquez and O. Pena}, url = {/brokenurl#<Go to ISI>://WOS:000333071400017}, doi = {10.1016/j.jssc.2014.01.017}, issn = {0022-4596}, year = {2014}, date = {2014-01-01}, journal = {Journal of Solid State Chemistry}, volume = {212}, pages = {114-120}, publisher = {2014 Elsevier Inc.}, abstract = {CuTi2-xMxS4 (M=Fe, Mn, Co; x=0.3, 0.5) and CuCr2-xTixSe4 (x=03, 0.5, 0.7) chalcospinels were synthesized by conventional solid-state reactions. Their crystal structures were determined by single-crystal X-ray diffraction. All of the phases crystallized in cubic spinel-type structures (space group, Fd (3) over barm). For all of the chalcospinel compounds, the edge-length distortion parameter (ELD) indicated that the most distorted polyhedron was Q[(Ti,M)(3)Cu], which displayed an similar to 8% distortion from an ideal tetrahedron structure (Q=S or Se)., The Mn-based thiospinel CuMn0.3Ti1.7S4 is paramagnetic, whereas the Fe-based thiospinels (CuTi2-xFexS4; x=0.3 and 0.7) are strongly antiferromagnetic due to their spin-glass states. The magnetic susceptibility measurements indicated ferromagnetic behavior for the selenospinels (CuCr2-xTixSe4; x=0.3, 0.5 and 0.7).}, keywords = {chalcospinel, copper crystal cucr2se4, cuti2s4, electrical-properties, geometry, lithium, magnetic polyhedra, properties, spinel structure, thiospinels, transport-properties}, pubstate = {published}, tppubtype = {article} } CuTi2-xMxS4 (M=Fe, Mn, Co; x=0.3, 0.5) and CuCr2-xTixSe4 (x=03, 0.5, 0.7) chalcospinels were synthesized by conventional solid-state reactions. Their crystal structures were determined by single-crystal X-ray diffraction. All of the phases crystallized in cubic spinel-type structures (space group, Fd (3) over barm). For all of the chalcospinel compounds, the edge-length distortion parameter (ELD) indicated that the most distorted polyhedron was Q[(Ti,M)(3)Cu], which displayed an similar to 8% distortion from an ideal tetrahedron structure (Q=S or Se)., The Mn-based thiospinel CuMn0.3Ti1.7S4 is paramagnetic, whereas the Fe-based thiospinels (CuTi2-xFexS4; x=0.3 and 0.7) are strongly antiferromagnetic due to their spin-glass states. The magnetic susceptibility measurements indicated ferromagnetic behavior for the selenospinels (CuCr2-xTixSe4; x=0.3, 0.5 and 0.7). |
2014 |
Synthesis and Magnetic Properties of Chromium-Based Cu(Cr2-Xtix)S-4 Thiospinels and Their Deficient Structures Cu1-Y Rectangle Ycr2-Xtixs4 Obtained by Copper Extraction Artículo de revista Journal of the Chilean Chemical Society, 59 (1), pp. 2294-2298, 2014, ISSN: 0717-9707. |
Crystal Structure and Magnetic Properties of Titanium-Based Cuti2-Xmxs4 and Cucr2-Xtixse4 Chalcospinels Artículo de revista Journal of Solid State Chemistry, 212 , pp. 114-120, 2014, ISSN: 0022-4596. |