Coordination Imperfection Suppressed Phase Stability of Ferromagnetic, Ferroelectric, and Superconductive Nanosolids

Incorporating the recent bond order−length−strength correlation mechanism [Sun; et al. J. Phys. Chem. B 2002, 106, 10701] into the Ising premise has led to consistent insight, with an analytical expression, into the Curie temperature (T C) suppression of ferromagnetic, ferroelectric, and superconduc...

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Published in:The journal of physical chemistry. B 2004-01, Vol.108 (3), p.1080-1084
Main Authors: Sun, Chang Q, Zhong, W. H, Li, S, Tay, B. K, Bai, H. L, Jiang, E. Y
Format: Article
Language:English
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Summary:Incorporating the recent bond order−length−strength correlation mechanism [Sun; et al. J. Phys. Chem. B 2002, 106, 10701] into the Ising premise has led to consistent insight, with an analytical expression, into the Curie temperature (T C) suppression of ferromagnetic, ferroelectric, and superconductive nanosolids. The phase stability is related to the atomic cohesive/exchange energy that is lowered by the coordination number (CN) imperfection of the lower coordinated atoms near the surface edge. A numerical match between predictions and measurements for a number of specimens reveals that the short spin−spin correlation dominates the exchange interaction in the ferromagnetic Fe, Co, Ni, and Fe3O2 nanosolids, whereas the long-range interaction dominates the exchange energy for the ferroelectric PbTiO3, PbZrO3, SrBi2Ta2O9, and BaTiO3 and the superconductive MgB2 nanosolids.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp0372946