Relaxors go critical
Article Abstract:
The mesoscopic and microscopic heterogeneities exhibited by relaxor ferroelectrics, which are solid solutions between a relaxor material and a ferroelectric such as lead titanate, have made it difficult to systematize observations of them or even to determine their whole phase diagram. Scientists apply a field along a cube diagonal in a new-generation relaxor ferroelectric, and find that a first-order jump in polarization with temperature, electric field and the material's composition.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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The giant electromechanical response in ferroelectric relaxors as a critical phenomenon
Article Abstract:
The giant electromechanical response in Pb([Mg.sub.1/3][Nb.sub.2/3])[O.sub.3]-PbTi[O.sub.3] (PMN-PT) are found to be manifestation of critical points that define a line in the phase diagram of the system. The observation of a significant decrease of energy cost and the electric field necessary to induce ferroelectric polarization rotations on approaching the critical point explains the giant electromechanical response of such relaxors.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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Unusual phase transitions in ferroelectric nanodisks and nonorods
Article Abstract:
The study performs ab initio studies of ferroelectric nanoscale disks and rods of technologically important Pb(Zr,Ti)O3 solid solutions, and demonstrate the existence of unknown phase transitions in zero-dimensional ferroelectric nanoparticles. The results suggest an innovative use of ferroelectric nanostructures for data storage, and are of fundamental value for the theory of phase transition in systems of low dimensionality.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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