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Phase transitions, relaxor behavior, and large strain response in LiNbO3-modified Bi0.5(Na0.80K0.20)0.5TiO3 lead-free piezoceramics
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10.1063/1.4816047
/content/aip/journal/jap/114/4/10.1063/1.4816047
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816047
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) SEM micrographs of the surface of BNKT20–LN ceramics. (b) Average grain size and relative density of BNKT20–LN ceramics as a function of LN content (inset of this figure shows the variation of optimum sintering temperature with LN content).

Image of FIG. 2.
FIG. 2.

(a) X-ray diffraction patterns of the crushed bulk samples for BNKT20–LN with different LN content, (b) Raman spectroscopy data for BNKT20–LN ceramics at room temperature. Spectral deconvolution was performed according to eight Gaussian-Lorentzian modes based on literature. The assignment of spectral modes to specific vibrations in the crystal lattice is superimposed on the graph.

Image of FIG. 3.
FIG. 3.

Lattice constant , , and tetragonality (/) as a function of in BNKT20–LN ceramics.

Image of FIG. 4.
FIG. 4.

TEM bright field images and corresponding diffraction patterns of BNKT20–0.025LN samples tilted to (a) [011], (b) [001], and (c) [111] zone axis.

Image of FIG. 5.
FIG. 5.

(a) The selected area electron diffraction pattern along [013] axis and (b) the corresponding TEM bright field image and of BNKT20–0.025LN ceramics.

Image of FIG. 6.
FIG. 6.

(a) hysteresis loops and (b) bipolar strain curves of BNKT20–LN with different LN content measured at 10 Hz, respectively [inset of Figure 6(a) is the current-electric filed curves for the indicated composition.

Image of FIG. 7.
FIG. 7.

(a) Unipolar strain curves of BNKT20–LN with different LN content, (b) unipolar strain ( ) and negative strain ( ) values for BNKT20–LN as a function of LN content, respectively (the inner schematic indicates the definition of in the present study). (c) Compositional dependence of normalized strain ( / ) and piezoelectric constant for BNKT20–LN (the inset figures illustrate variation of planar electromechanical coupling factor with LN content).

Image of FIG. 8.
FIG. 8.

measurements of dielectric constant under bias field at 10 kHz (solid line: first cycle, dotted line: second cycle).

Image of FIG. 9.
FIG. 9.

Temperature dependence of dielectric permittivity and loss tangent for poled BNKT20–LN samples, with the measuring frequency from 1 kHz to 1 MHz.

Image of FIG. 10.
FIG. 10.

(a) Temperature dependence of dielectric permittivity and loss tangent for poled BNKT20–LN samples at a measuring frequency of 1 kHz, (b) the enlarged view of Figure 10(a) in the temperature below 150 °C, (c) Temperature dependence of depolarization current for poled BNKT20–LN samples, (d) Compositional dependence of , , and as a function of for BNKT20–LN.

Image of FIG. 11.
FIG. 11.

Temperature dependence of (a) calculated (= ) and (b) measured for poled BNKT20–LN samples, (c) annealing temperature dependence of for poled BNKT20–LN samples.

Image of FIG. 12.
FIG. 12.

(a) Raman spectroscopy data for BNKT20 composition with increasing temperature. (b) Raman spectra of BNKT20 at RT and 250 °C, respectively. The open circles are plotted for the experimental data, the red solid lines show the calculated fits, and dotted lines display the spectral deconvolution.

Image of FIG. 13.
FIG. 13.

Temperature dependence of selected modes of the BNKT20 spectrum. (a) The peak position and intensity of the A-site-mode centered at ∼120 cm, (b) The peak positions and intensities for the B-site selected modes, centered at 260 cm, 520 cm, and 610 cm, respectively.

Image of FIG. 14.
FIG. 14.

Temperature-dependent hysteresis loops and bipolar strain curves for (a), (d) 0LN; (b), (e) 0.01LN; and (c), (f) 0.02LN, respectively.

Image of FIG. 15.
FIG. 15.

measurements of under bias field for (a) 0.01LN and (b) 0.02LN at different temperatures.

Image of FIG. 16.
FIG. 16.

Variations of and values for BNKT20–LN ceramics with temperature.

Image of FIG. 17.
FIG. 17.

(a) Temperature dependence of ( / ) and for BNKT20 samples (inset figure shows temperature dependence of and for this sample), (b) Influence of bias field on permittivity (at 10 kHz) of poled BNKT20 samples.

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/content/aip/journal/jap/114/4/10.1063/1.4816047
2013-07-24
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Phase transitions, relaxor behavior, and large strain response in LiNbO3-modified Bi0.5(Na0.80K0.20)0.5TiO3 lead-free piezoceramics
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816047
10.1063/1.4816047
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