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- Title
Effect of Cr<sub>2</sub>O<sub>3</sub> modification on dielectric, ferroelectric and field-induced strain properties of 0.18Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>–0.82Pb(Zr<sub>0.49</sub>Ti<sub>0.51</sub>)O<sub>3</sub> ceramics.
- Authors
Zhang, Xiaobao; Yang, Lu; Ji, Hongli; Qiu, Jinhao
- Abstract
A systematic investigation was performed to study the effect of Cr2O3 on dielectric, ferroelectric and field-induced strain properties of 0.18Pb(Mg1/3Nb2/3)O3–0.82Pb(Zr0.49Ti0.51)O3 (0.18PMN–0.82PZT) ceramics. The PMNZT/<italic>x</italic>Cr2O3 (with <italic>x</italic> = 0, 0.1, 0.15, 0.2, 0.25, 0.30, 0.50 wt%) ceramics were prepared by solid state reaction and sintering process. Dielectric properties of the as-prepared ceramics were characterized, wherein the maximum dielectric constant (<italic>ɛ</italic>m) presents an increasing trend when <italic>x</italic> < 0.15, followed by a down-trend with an abrupt increase at <italic>x</italic> = 0.50. The temperature of maximum dielectric constant (<italic>T</italic>m) appears to display a slight change from 297 °C (<italic>x</italic> = 0.50) to 310 °C (<italic>x</italic> = 0.30). At 1 kHz, the sample with composition of <italic>x</italic> = 0.15 has the largest room temperature dielectric constant <italic>ɛ</italic>r of 1599 and maximum dielectric constant <italic>ɛ</italic>m of 25813 at <italic>T</italic>m, while the sample with composition of <italic>x</italic> = 0.3 possess the maximum dielectric relaxor factor of γ = 1.93. The remnant polarization gradually decreased from 37.3 to 23.10 μC/cm2 with increasing Cr2O3 content. Meanwhile, compared with pure 0.18PMN–0.82PZT, the coercive field (<italic>E</italic>c) of the 0.18PMN–0.82PZT+<italic>x</italic>Cr2O3 ceramics are found to be significantly improved when <italic>x</italic> > 0.10. Furthermore, the field-induced strain of 0.18PMN–0.82PZT+<italic>x</italic>Cr2O3 ceramics appeared to be lower than that of pure 0.18PMN–0.82PZT. However, an up-trend is observable in the field-induced strain of 0.18PMN–0.82PZT+<italic>x</italic>Cr2O3 ceramics with increasing Cr2O3 content up to <italic>x</italic> = 0.15, which corresponds to a peak value of 0.158%.
- Subjects
DIELECTRIC properties of perovskite; FERROELECTRIC materials; PEROVSKITE; SINTERING; SOLID state chemistry; STRAINS &; stresses (Mechanics)
- Publication
Journal of Materials Science: Materials in Electronics, 2018, Vol 29, Issue 5, p3602
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-017-8290-7