The lattice parameters and the quadrupole splittings of the room-temperature Mijssbauer spectra of the cubic A,FeSbO, pyrochlores (A = Sm, Eu, Gd, Tb, Y, Er, Lu) have been found to vary linearly with the Templeton-Dauben radii of the A3+ ions. The variation of the quadrupole splitting c a n be correlated with the positional parameter of the majority oxygen atom, x(02), which determines the degree of distortion of the B 0 6 octahedron in cubic A2B207 pyrochlores. A n increase of 0.1 A in r(A3+) corresponds to a decrease of ca. 0.20 mm/s in the quadrupole splitting in the AzFeSb07 series, and to an estimated increase of ca. 0.005 in ~( 0 , ) . The isomer shift and quadrupole splitting at room temperature are typical of Fe3+ (high spin) in octahedral coordination of relatively high distortion. Y'FeSbO, at 4.2 "K was found to exhibit magnetic order with a hyperfinemagnetic field ofapproximately 400 kOe. An attempt to prepare a cubic La2FeSb07 pyrochlore by the standard procedure was not successful.
Self-timed packet-switched networks are poised to take a major role in addressing the complex system design and timing closure problems of future complex Systems-on-Chip. The robust, correct-by-construction characteristics of self-timed communications enables each IP block on the SoC to operate in its own isolated timing domain, greatly simplifying the problems of timing verification. Design automation software can remove the need for expertise in self-timed design, enabling the on-chip interconnect to be treated as an additional IP block within a conventional (synchronous) design flow.The paradigm shift from viewing the SoC design problem as a matter of organizing complex hierarchies of buses with multiple coupled timing domains, where every interface between timing domains must be verified carefully, to viewing the SoC as a problem in network design where those timing issues are automatically isolated, promises significant improvements in designer productivity, component reuse and SoC functionality.
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