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We focus on the conductivity analysis of Aurivillius family of six-layered intergrowth compound, namely Bi7Ti4NbO21. The compound was prepared by solid state intergrowth route. The product compound belongs to orthorhombic structure and the lattice parameters were found to be: (a = 5.442 A0, b = 5.404 A0, c = 57.990 A0). The frequency dependent impedance measurements were made on the sample over a frequency range of 100 - 1MHz, right from room temperature to 500°C. A detailed study on ac-conductivity and complex impedance analysis was carried out on the said above intergrowth compound. The depressed and asymmetric semicircles of Cole-Cole plots suggest that the charge carriers are of non-Debye (multiple) type. The charge carriers were found to be controlled by thermally-activated process. Temperature dependent ac-conductivity data show change of slopes in the vicinity of intermediate and higher frequency domain. Finally, results were corroborated to the dielectric and FTIR data. [ABSTRACT FROM AUTHOR]

The neutron-rich nuclei 72Ni and 72Cu have been produced in the proton-induced fission of 238U at the LISOL and ISOLDE facilities of Louvain-La-Neuve and CERN. Partial β-decay schemes are presented, giving some information about the nuclear structure of their daughter nuclei 72Cu and 72Zn. The lifetime of 72Cu was determined to be T1/2 = 6.63(3) s, in line with previous measurements. No β-decaying isomeric states were identified in 72Cu, in contrast to 70Cu. The spin and the parity of several states in 72Cu are tentatively assigned and a comparison is made with different shell-model predictions. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Novel ceramics of Bi3.25La0.75Ti3-xZrxO12(x = 0.1,0.3,0.5,0.7&1) were prepared by solid state route. X-ray diffraction analysis indicate formation of single phase layered-perovskite with pseudo-orthorhombic structure. Ti-O stretching mode was observed in FTIR data. Dielectric and impedance measurements were also made on the ceramics. [ABSTRACT FROM AUTHOR]