RELATIONSHIP BETWEEN CRYSTAL STRUCTURE AND ELECTRICAL PROPERTIES OF ND(CR1-XFEX)O-3

摘要

Perovskite-type Nd(Cr1-xFex)O-3 was synthesized in the range 0.0 less than or equal to x less than or equal to 1.0, and has the orthorhombic GdFeO3-type structure with space group Pnma. The increase of the (Cr, Fe)-O distance and the effective magnetic moment (mu(eff)) indicates that the Fe3+ ion is in the high-spin state with the (d epsilon)(3)(d gamma)(2) electronic configuration. Rietveld analysis indicates that the increase of the (Cr, Fe)-O distance and the decrease of the angles for (Cr, Fe)-O(1 and 2)-(Cr, Fe) make pi-bonding decrease. From the electrical resistivity (rho) measurement, Nd(Cr1-xFex)O-3 is a semiconductor with activation energy (E-a) approximate to 0.16- approximate to 0.89 eV. The temperature independence of the Seebeck coefficient (alpha) indicates that the mobility (mu) decreases With increasing x. (C) 1997 Academic Press. [References: 19]