STRUCTURAL ASPECTS ON THE VARIATIONS OF ELECTRIC AND MAGNETIC-PROPERTIES OF THE LAYERED COMPOUND SYSTEM SRN+1VNO3N+1-DELTA(N=1,2,3,INFINITY)

Variations of the electric and magnetic properties through the change in the number of perovskite slabs in the series of compounds Srn+1VnO3n+1-delta(n = 1,2,3,infinity) were discussed based on the data of resistivity, magnetic susceptibility, and interatomic distances determined by the powder X-ray diffraction analysis. Change from metallic SrVO3-delta, Sr3V2O7-delta, and Sr4V3O10-delta to semiconductive Sr2VO4-delta through the change of the n could be correlated to the change in the V-O distances along the c-axis. One d electron associated with V4+ ion may occupy the 3-fold degenerate t2g d orbital in the compounds with n = 3 and infinity, the 2-fold degenerate orbitals d(yz) and d(zx) in the compound with n = 1, and non-degenarate d(xy) orbital in the compound with n = 2.