Dielectric response and electric modulus of Y2CrCoO6 perovskite

Structural characterization and electrical properties of carbon nanotubes/epoxy polymer composites

“…This electrical behavior is observed in materials of entirely different types, such as disordered semiconductors, polymers, conducting polymer compounds, ceramics, ion conducting glasses, heavily doped ionic crystals, etc. The dispersion region emerges from the DC conductivity plateau at the characteristic frequency ( f c ) where the relaxation effects of the ions occur . This characteristic frequency is, however, a not well‐defined material parameter; it depends upon many factors, such as the method of the synthesis, microstructure formation, composition, etc .…”

Anomalous High Temperature Structural Behavior of Potential Multifunctional Material SmCo0.5Cr0.5O3

“…Increase of the Neél temperature and widening of energy gap in NdCo 1– x Cr x O 3 series are associated with reducing overlap between t 2g orbitals of B cations (with three electrons for Cr 3+ or six electrons for Co 3+ ) and oxygen p π orbitals, thus a π bonding becomes weakest . The weakness of π bonding, which is resulted in decrease of conductivity with decreasing cobalt content, was also observed in the GdCo 1– x Cr x O 3 system and in the YCo 0.5 Cr 0.5 O 3 material , . For the PrCoO 3 ‐PrCrO 3 system only room temperature structural investigations were performed …”

“…Previous investigations of the mixed cobaltite‐chromites R Co 1– x Cr x O 3 (with R = La, Nd, Gd, and Y) show strong effect of B ‐cation substitution in octahedral sites of orthorhombic perovskite structure ( B = Co 3+ , Cr 3+ ) on structural, electrical and magnetic properties of the materials. Structural phase transition from orthorhombic Pnma to rhombohedral R 3 c perovskite structure was found in the LaCo 1– x Cr x O 3 system .…”

“…[9] The weakness of π bonding, which is resulted in decrease of conductivity with decreasing cobalt content, was also observed in the GdCo 1-x Cr x O 3 system and in the YCo 0.5 Cr 0.5 O 3 material. [10,11] For the PrCoO 3 -PrCrO 3 system only room temperature structural investigations were performed. [12] The aim of the present work is thorough investigation of high temperature structural behavior of the mixed cobaltitechromite SmCo 0.5 Cr 0.5 O 3 by using in situ high resolution X-ray synchrotron powder diffraction.…”

“…The transport, magnetic and other properties of RCoO 3 -based materials are dependent upon a spin state of Co 3+ ions, which can undergo transitions from low spin (LS) to intermediate (IS) or high spin (HS) state with increasing temperature. [5][6][7] Previous investigations of the mixed cobaltite-chromites RCo 1-x Cr x O 3 (with R = La, Nd, Gd, and Y) [8][9][10][11] show strong effect of B-cation substitution in octahedral sites of orthorhombic perovskite structure (B = Co 3+ , Cr 3+ ) on structural, electrical and magnetic properties of the materials. Structural phase transition from orthorhombic Pnma to rhombohedral R3c perovskite structure was found in the LaCo 1-x Cr x O 3 system.…”