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A 2 B 2 O 7 Pyrochlore Structure

A. BO 6. O. CAREER: Fundamental Structure-Dielectric Property Relationships of Fluorite Related compounds Juan C. Nino, University of Florida, DMR 0449710. A 2 B 2 O 7 Pyrochlore Structure.

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A 2 B 2 O 7 Pyrochlore Structure

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  1. A BO6 O CAREER: Fundamental Structure-Dielectric Property Relationships of Fluorite Related compoundsJuan C. Nino, University of Florida, DMR 0449710 A2B2O7 Pyrochlore Structure Bi-based pyrochlores are among the most studied compounds in the family of fluorite-related structures due to their interesting dielectric properties. They undergo a dielectric relaxation [time lag between electric field and polarization] that is temperature and frequency dependent. Given that bismuth is the dominant element on the A site of Bi-based pyrochlores, until recently, it was speculated that the observed relaxor dielectric behavior was associated to the presence of Bi (with its lone electron pair). Dielectric relaxation in Ca1.469Ti1.469Nb1.037O7pyrochlore However, in collaboration with NIST, CNRS, and CSIRO, we have now shown that a displacive cubic pyrochlore not containing bismuth, namely Ca1.469Ti1.469Nb1.037O7, also displays dielectric relaxation. This combined crystallographic and electrical characterization result provides an important new insight into our understanding of the nature of the dielectric relaxation behavior of pyrochlores. XRD profile confirming pyrochlore phase

  2. CAREER: Fundamental Structure-Dielectric Property Relationships of Fluorite Related compoundsJuan C. Nino, University of Florida, DMR 0449710 Education and Outreach As part of the educational and outreach component of this program, the PI organized and delivered the first in the series of International Workshops on Electroceramics across the Bolivarian countries in South America. This first workshop took place in the Universidad del Valle, Cali, COLOMBIA, from August 8-10, 2007. The local host was Prof. Pedro Prieto, director of the Excellence Center in Novel Materials (CENM). The workshop was attended by 68 participants including faculty, undergraduate and graduate students from across Colombia.. Topics covered included dielectrics, ferroelectrics, fuel cells, and thermoelectrics and were presented by the PI Nino, P. Prieto, and faculty from other Colombian universities through a series of technical talks and laboratory tours. Besides the technical sessions, there was very fruitful general discussion on opportunities for Colombian faculty and students towards scientific collaboration and exchange with University of Florida and the US in general.

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