Abstract
Perovskite-type Nd(Cr1−xCOx)O3was synthesized in the range 0 ≤x≤ 1.0, and has the orthorhombic GdFeO3-type structure with space groupPnma. The decrease of the average (Cr, Co)–O distance and the effective magnetic moment (μeff) indicate that the Co3+ion in Nd(Cr1−xCOx)O3is in the low-spin state (dϵ)6(dγ)0at low temperature. With increasing temperature, the 1/χ-Tcurve exhibits the plateau, and this plateau indicates the temperature interval where there is a conversion from the low-spin state of the Co3+ion to a mixed spin state. From the results of the electrical resistivity (ρ), Nd(Cr1−xCox)O3is semiconductive with the energy gap (Eg) of ≈0.36–0.47 eV. The log ρ-1000/Tcurves at high temperature deviate from those at low temperature. Rietveld analysis indicates that each (Cr, Co)O6octahedron has little distortion and that the average angles for (Cr, Co)–O(1 and 2)–(Cr, Co) increase with increasingx, in agreement with the decrease in the average (Cr, Co)–O distance. Therefore, it is apparent that the magnetic and electrical properties of Nd(Cr1−sCox)O3depend on the spin state of the Co3+ion and a cation–anion–cation overlap.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
