| Pressure-induced phase transitions in PbTiO3: a query for the polarization rotation theory. | |
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MedLine Citation:
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PMID: 17408259 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Our first-principles computations show that the ground state of PbTiO3 under hydrostatic pressure transforms discontinuously from P4mm to R3c at 9 GPa. Spontaneous polarization decreases with increasing pressure so that the R3c phase transforms to the centrosymmetric Rc phase at around 27 GPa. The first-order phase transition between the tetragonal and rhombohedral phases is exceptional since there is no evidence for a bridging phase. The essential feature of the R3c and Rc phases is that they allow the oxygen octahedron to increase its volume VB at the expense of the cuboctahedral volume VA around a Pb ion. This is further supported by the fact that neither the R3m nor Cm phase, which keep the VA/VB ratio constant, is a ground state within the pressure range between 0 and 40 GPa. Thus, tetragonal strain is dominant up to 9 GPa, whereas at higher pressures, efficient compression through oxygen octahedra tilting plays the central role for PbTiO3. Previously predicted pressure induced colossal enhancement of piezoelectricity in PbTiO3 corresponds to unstable Cm and R3m phases. This suggests that the phase instability, in contrast to the polarization rotation, is responsible for the large piezoelectric properties observed in systems like Pb(Zr,Ti)O3 in the vicinity of the morphotropic phase boundary. |
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Authors:
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J Frantti; Y Fujioka; R M Nieminen |
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Publication Detail:
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Type: Journal Article Date: 2007-04-05 |
Journal Detail:
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Title: The journal of physical chemistry. B Volume: 111 ISSN: 1520-6106 ISO Abbreviation: J Phys Chem B Publication Date: 2007 May |
Date Detail:
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Created Date: 2007-04-26 Completed Date: 2007-07-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
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Languages: eng Pagination: 4287-90 Citation Subset: - |
Affiliation:
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Laboratory of Physics, Helsinki University of Technology, P.O. Box 4100, FIN-02015 HUT, Finland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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