Giant pyroelectric properties in La and Ta co-doped lead-free 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 ceramics

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dc.contributor.authorBalakt, Ahmed M.
dc.contributor.authorShaw, Christopher P.
dc.contributor.authorZhang, Qi
dc.date.accessioned2017-03-20T10:30:30Z
dc.date.available2017-03-20T10:30:30Z
dc.date.issued2017-03-14
dc.description.abstractLa and Ta co-doped Lead-free 0.94NBT-0.06BT ceramics were synthesized by a conventional solid-state route. The compositions remain at a morphotropic phase boundary. The depolarization temperature (Td) decreased with increasing doping contents. The room temperature (RT) pyroelectric coefficient (p) was highly enhanced compared with undoped material (3.15 × 10−4 C m−2 °C−1) and reached 12.9 × 10−4 C m−2 °C−1, whereas, at Td, 58.6 × 10−4 C m−2 °C−1 could be obtained rather than 23.9 × 10−4 C m−2 °C−1 for undoped materials. The pyroelectric figure of merits, Fi and Fv, also showed a huge improvement from 1.12 × 10−10 m v−1 and 0.021 m2 C−1 of undoped material to 4.61 × 10−10 m v−1 and 0.078 m2 C−1 of doped materials at RT, and to 20.94 × 10−10 m v−1 and 0.28 × 10−10 m2.C−1 at Td. RT FC values are ∼2.40, 2.46, and 2.57 (×10−9 C cm−2 °C−1) at frequency 33, 100 and 1000 (Hz) respectively, at La = Ta = 0.2%. The pyroelectric coefficient achieved at RT in this study is almost one order of magnitude higher than PZT materials, furthermore, the figure of merits of the new compositions are comparable with or even better in those of PZT materials and other lead-free ceramics. The improvement in the pyroelectric properties makes La and Ta co-doped NBT-0.06BT ceramics possible materials to replace lead-containing PZT ceramics for infrared detector materials at a wide temperature range.en_UK
dc.identifier.citationA.M. Balakt, C.P. Shaw, Qi Zhang, Giant pyroelectric properties in La and Ta co-doped lead-free 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 ceramics, Journal of Alloys and Compounds, Volume 709, 30 June 2017, Pages 82-91en_UK
dc.identifier.issn0925-8388
dc.identifier.urihttp://dx.doi.org/10.1016/j.jallcom.2017.03.143
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/11619
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectElectroceramicen_UK
dc.subjectLead-free ceramicsen_UK
dc.subjectLanthanum and tantalum co-doping NBT-0.06BTen_UK
dc.subjectMorphotropic phase boundary (MPB)en_UK
dc.subjectDepolarization temperatureen_UK
dc.subjectPyroelectric propertiesen_UK
dc.subjectFigure of meritsen_UK
dc.titleGiant pyroelectric properties in La and Ta co-doped lead-free 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 ceramicsen_UK
dc.typeArticleen_UK

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