Nanoscale compositional segregation and suppression of polar coupling in a relaxor ferroelectric
A number of relaxor ferroelectric ceramics have been demonstrated to possess a near stable value of relative permittivity over very wide temperature ranges. This cannot be explained by conventional theories of relaxors. One such system is based on the perovskite solid solution series: (1-x) (Ba0.8Ca...
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| Published in | Acta materialia Vol. 158; pp. 422 - 429 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
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01.10.2018
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| Abstract | A number of relaxor ferroelectric ceramics have been demonstrated to possess a near stable value of relative permittivity over very wide temperature ranges. This cannot be explained by conventional theories of relaxors. One such system is based on the perovskite solid solution series: (1-x) (Ba0.8Ca0.2)TiO3-xBi(Mg0.5Ti0.5)O3, giving stable relative permittivity from 150 to 500 °C. We show by scanning transmission electron microscopy and electron energy loss spectroscopic elemental mapping that nanoscale compositional segregation occurs in the temperature stable relaxor composition (x = 0.55), with Ba/Ti clusters some 2–4 nm in extent, separated by Bi-rich regions of comparable size. This nanomosaic structure is consistent with phase separation into a ferroelectrically active BaTiO3 – type phase (Ba/Ti rich) and a weakly polar Bi/(Mg) rich perovskite solid solution. The possibility that nanophase segregation is the cause of weak dipole coupling and suppression of the dielectric relaxation peak is considered.
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| AbstractList | A number of relaxor ferroelectric ceramics have been demonstrated to possess a near stable value of relative permittivity over very wide temperature ranges. This cannot be explained by conventional theories of relaxors. One such system is based on the perovskite solid solution series: (1-x) (Ba0.8Ca0.2)TiO3-xBi(Mg0.5Ti0.5)O3, giving stable relative permittivity from 150 to 500 °C. We show by scanning transmission electron microscopy and electron energy loss spectroscopic elemental mapping that nanoscale compositional segregation occurs in the temperature stable relaxor composition (x = 0.55), with Ba/Ti clusters some 2–4 nm in extent, separated by Bi-rich regions of comparable size. This nanomosaic structure is consistent with phase separation into a ferroelectrically active BaTiO3 – type phase (Ba/Ti rich) and a weakly polar Bi/(Mg) rich perovskite solid solution. The possibility that nanophase segregation is the cause of weak dipole coupling and suppression of the dielectric relaxation peak is considered.
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| Author | Zeb, Aurang Harrington, John Milne, Steven J. Brown, Andy P. Roncal-Herrero, Teresa |
| Author_xml | – sequence: 1 givenname: Teresa orcidid: 0000-0002-3673-6904 surname: Roncal-Herrero fullname: Roncal-Herrero, Teresa email: t.roncal@leeds.ac.uk organization: School of Chemical and Process Engineering, University of Leeds, Leeds LS29JT, United Kingdom – sequence: 2 givenname: John surname: Harrington fullname: Harrington, John email: j.p.harrington@leeds.ac.uk organization: School of Chemical and Process Engineering, University of Leeds, Leeds LS29JT, United Kingdom – sequence: 3 givenname: Aurang surname: Zeb fullname: Zeb, Aurang email: zebicp@gmail.com organization: Department of Physics, Islamia College, Peshawar, KP, Pakistan – sequence: 4 givenname: Steven J. orcidid: 0000-0002-1365-7365 surname: Milne fullname: Milne, Steven J. email: s.j.milne@leeds.ac.uk organization: School of Chemical and Process Engineering, University of Leeds, Leeds LS29JT, United Kingdom – sequence: 5 givenname: Andy P. surname: Brown fullname: Brown, Andy P. email: a.p.brown@leeds.ac.uk organization: School of Chemical and Process Engineering, University of Leeds, Leeds LS29JT, United Kingdom |
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| Cites_doi | 10.1103/PhysRevB.93.104106 10.1111/j.1551-2916.2008.02798.x 10.1016/0022-1902(68)80066-1 10.1111/j.1551-2916.2011.04695.x 10.1103/PhysRevLett.54.2038 10.1088/0957-4484/18/33/335604 10.1063/1.4935417 10.1063/1.4967222 10.1103/PhysRevLett.110.147602 10.1038/nature22068 10.1103/PhysRevB.46.8003 10.1007/s10854-015-3707-7 10.1111/j.1151-2916.1987.tb04936.x 10.1103/PhysRevB.74.144107 10.1111/jace.12412 10.1016/0038-1098(83)90132-1 10.1021/cm061129w 10.1103/PhysRevLett.84.5216 10.1016/j.jeurceramsoc.2017.12.032 |
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| Keywords | Chemical segregation Electron microscopy Functional ceramics Ferroelectric relaxor |
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| SubjectTerms | Chemical segregation Electron microscopy Ferroelectric relaxor Functional ceramics |
| Title | Nanoscale compositional segregation and suppression of polar coupling in a relaxor ferroelectric |
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