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Large pyroelectric properties at reduced depolarization temperature in A-site nonstoichiometry composition of lead-free 0.94Na.sub.xBi.sub.yTiO.sub.3-0.06Ba.sub.zTiO.sub.3 ceramics

Journal of materials science, 2017-06, Vol.52 (12), p.7382 [Peer Reviewed Journal]

COPYRIGHT 2017 Springer ;ISSN: 0022-2461 ;EISSN: 1573-4803 ;DOI: 10.1007/s10853-017-0973-1

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  • Title:
    Large pyroelectric properties at reduced depolarization temperature in A-site nonstoichiometry composition of lead-free 0.94Na.sub.xBi.sub.yTiO.sub.3-0.06Ba.sub.zTiO.sub.3 ceramics
  • Author: Balakt, A. M ; Shaw, C. P ; Zhang, Qi
  • Subjects: Ceramics
  • Is Part Of: Journal of materials science, 2017-06, Vol.52 (12), p.7382
  • Description: Nonstoichiometry lead-free 0.94Na.sub.xBi.sub.yTiO.sub.3-0.06Ba.sub.zTiO.sub.3 (N.sub.xB.sub.yT-0.06B.sub.zT) (from x = y = 0.5, z = 1.00 to x = 0.5, y = 0.534, z = 1.02) ceramic compositions were prepared by a conventional solid-state route. XRD shows that the compositions are at a morphotropic phase boundary where rhombohedral and tetragonal phases coexist. The depolarization temperature (T.sub.d) can be lowered by modifying x, y and z. The pyroelectric coefficient (p) of nonstoichiometry N.sub.xB.sub.yT-0.06B.sub.zT compositions is greatly increased, compared with stoichiometry NBT-0.06BT composition, from 3.15 x 10.sup.-4 C m.sup.-2 °C.sup.-1 at room temperature (RT) and 23.9 x 10.sup.-4 C m.sup.-2 °C.sup.-1 at T.sub.d, and reaches maxima of 6.99 x 10.sup.-4 C m.sup.-2 °C.sup.-1 at RT and 75.3 x 10.sup.-4 C m.sup.-2 °C.sup.-1 at T.sub.d for x = y = 0.52 and z = 1. The figures of merits, F.sub.i, F.sub.v, and F.sub.D, also have been improved from 1.12 x 10.sup.-10 m v.sup.-1 and 0.021 m.sup.2 C.sup.-1 to 2.50 x 10.sup.-10 m v.sup.-1, 0.047 m.sup.2 C.sup.-1 and 16.63 x 10.sup.-6 Pa.sup.-1/2, respectively, for N.sub.0.52B.sub.0.52T-0.06BT composition at RT. Furthermore, N.sub.0.52B.sub.0.52T-0.06BT composition shows a huge enhancement in F.sub.i, F.sub.v and F.sub.D to 26.9 x 10.sup.-10 m v.sup.-1, 0.39 x 10.sup.-10 m.sup.2 C.sup.-1 and 138.7 x 10.sup.-6 Pa.sup.-1/2, respectively, at T.sub.d. The same composition also presents F.sub.C values which are ~2.58 and ~2.86 (x10.sup.-9 C cm.sup.-2 °C.sup.-1) at RT at 100 and 1000 (Hz). N.sub.0.5B.sub.0.534T-0.06BT and N.sub.0.5B.sub.0.534T-0.06B.sub.1.02T compositions show a large p values at a wide temperature range. The enhanced pyroelectric properties make nonstoichiometry N.sub.0.52B.sub.0.52T-0.06BT composition a promising candidate for pyroelectric and other applications at wide temperatures range.
  • Publisher: Springer
  • Language: English
  • Identifier: ISSN: 0022-2461
    EISSN: 1573-4803
    DOI: 10.1007/s10853-017-0973-1
  • Source: ProQuest Central
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