Abstract:Magnetic resonance characteristics of mixed chalcospinel nanocrystals CuCr 2 S x Se 4-x (x = 0 and 2) and Co x Cu 1−x Cr 2 S 4 (x = 0.1 and 0.2) have been investigated. It has been established based on TEM, SEM and resonance data that all the samples contain both blocks with sizes from 1 to 50 m of compacted nanosized crystallites and individual nanoparticles with sizes from 10 to 30 nm. The studies provide evidence of strong interparticle interaction in all the samples leading to high values of the blocking … Show more
“…For example, the T C of the ferromagnetic CuCr 2 S 4−y Se y spinel systematically increases as the Se (y) content increases. 21,22 Similarly, changes are induced by chemical substitution of S by Se in the metal insulator CuIr 2 S 4 to form CuIr 2 (S 1−y Se y ) 4 . The metal− insulator transition occurs at a lower temperature and a full metallic state for y ≥ 0.8.…”
A new series of (Cu) tet [Cr 2−x Sn x ] oct S 4−y Se y compounds was prepared by solid-state reaction at high temperature. Determination of the crystal structures by single-crystal X-ray diffraction revealed that CuCr 1.
“…For example, the T C of the ferromagnetic CuCr 2 S 4−y Se y spinel systematically increases as the Se (y) content increases. 21,22 Similarly, changes are induced by chemical substitution of S by Se in the metal insulator CuIr 2 S 4 to form CuIr 2 (S 1−y Se y ) 4 . The metal− insulator transition occurs at a lower temperature and a full metallic state for y ≥ 0.8.…”
A new series of (Cu) tet [Cr 2−x Sn x ] oct S 4−y Se y compounds was prepared by solid-state reaction at high temperature. Determination of the crystal structures by single-crystal X-ray diffraction revealed that CuCr 1.
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