High and Temperature-Insensitive Piezoelectric Strain in Alkali Niobate Lead-free Perovskite

Zhang, Mao‐Hua; Du, Yu; Dai, Gang; Sun, Wei; Li, Geng; Hu, Duan; Thong, Hao‐Cheng; Zhao, Chunlin; Xi, Xiaoqing; Yue, Zhenxing; Li, Jing‐Feng

doi:10.1021/jacs.7b00520

Cited by 307 publications

(168 citation statements)

References 48 publications

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“…For the ceramics with x = 0.04, a highly initial S uni of 0.16% and relatively high normalized S uni of 74% at T = 180 °C were observed (Figure 4c,f). Thus, our results were visibly comparable to those of abovementioned lead-free ceramics in both S uni and its temperature stability, [6,15,20,27,28] which was promising for the lead-free piezoelectric actuator applications. In addition, the obtained d 33 and T C values in this work were also superior to those of other KNN-based ceramics (Figure 5d).…”

Section: Wwwadvelectronicmatdesupporting

confidence: 80%

“…Previously, both MnO 2 -modified KNN-BLT-BZ and KNNS-BNKH ceramics were endowed with good piezoelectric properties and temperature stability due to R-T phase coexistence (Figure 5c). [15,27] A temperature-insensitive behavior was reported in KNNLT-CZ5 ceramics at T = 22-175 °C, accompanying with an initial S uni of <0.13%. [23] Recently, Zhai et al improved the temperature stability of strain in textured KNNS-CZ-BKH ceramics using the RTGG method.…”

Section: Wwwadvelectronicmatdementioning

confidence: 93%

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Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Xiao

et al. 2018

Adv Elect Materials

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Particularly, unipolar strain and its temperature stability comparable to those of soft PZT-4 ceramics were reported in textured (K 0.44 Na 0.52 Li 0.04 )(Nb 0.84 Ta 0.10 Sb 0.06 )O 3 (LF4T) ceramics synthesized by the reactive template grain growth (RTGG) method. [6] Subsequent investigations focused on the improvement of both unipolar strain and its temperature stability using conventional sintering method due to high cost of RTGG. Vast studies strongly proved that phase boundary is an effective way to improve strain properties of KNN-based ceramics. [1] Particularly, the construction of new phase boundary by simultaneously shifting the rhombohedral-orthorhombic and orthorhombic-tetragonal phase transition temperature (e.g., T R-O and T O-T ) toward room temperature proved to enhance the piezoelectric properties of KNN-based ceramics. [1,7] Although the improved piezoelectricity can be guaranteed by means of phase boundaries, the related electrical properties still exhibited the strong temperature dependence due to the nature of polymorphic phase boundary that is different from the morphotropic phase boundary in PZT-based ceramics. [1,2,4,5] More importantly, the systematical investigations on how the phase boundaries affected the strain and its temperature stability is still missing, which could further promote the understanding of KNNbased ceramics.Recently, the temperature-insensitive dielectric properties were reported in SrZrO 3 -modified KNN-based ceramics, accompanying with small permittivity variation of ±15% (−65 to 201 °C). [8] Here, (0.99-x)(K 0.5 Na 0.5 )(Nb 0.965 Sb 0.035 )O 3 -0.01SrZrO 3 -x(Bi 0.5 Na 0.5 )ZrO 3 (x = 0-0.05) ceramics were chosen as an example to illustrate the effects of phase boundaries on the strain and its temperature stability. Through the study of temperature-dependent unipolar strain at different phase boundaries and similar phase boundary with different locations, effects of phase boundaries on strain and its temperature stability were illustrated. More importantly, the improved temperature stability of unipolar strain (S uni ) was observed in the ceramics (x = 0.03), e.g., high retention (≈95%) of S uni at T = 180 °C and low variation of 24% at T = 20-180 °C. The related physical mechanisms were discussed in detail. Results and DiscussionA typical perovskite structure without any other secondary phases was found in all samples ( Figure S1, Supporting Information).

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Section: Wwwadvelectronicmatdesupporting

confidence: 80%

Section: Wwwadvelectronicmatdementioning

confidence: 93%

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Xiao

et al. 2018

Adv Elect Materials

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“…We observed an appreciable contrast in brightness accompanied by a phase difference near 180 o in the phase image ( Figure 5B1), strongly indicating a sufficient domain orientation. 25 After 30 minutes, the amplitude and phase of the area were recorded again. 24 MnO 2 -modified (Na 0.5 K 0.5 )NbO 3 -(Bi 0.5 Li 0.5 )TiO 3 -BaZrO 3 ceramics with an R-T phase boundary also had a similarly low driven-voltage for the complete reorientation of the domain, indicating easy domain switching.…”

Section: Ferroelectric Domainsmentioning

confidence: 99%

Structural evolution of the R‐T phase boundary in KNN‐based ceramics

Xiao

et al. 2017

J Am Ceram Soc

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Although a rhombohedral‐tetragonal (R‐T) phase boundary is known to substantially enhance the piezoelectric properties of potassium‐sodium niobate ceramics, the structural evolution of the R‐T phase boundary itself is still unclear. In this work, the structural evolution of R‐T phase boundary from −150°C to 200°C is investigated in (0.99−x)K0.5Na0.5Nb1−ySbyO3–0.01CaSnO3–xBi0.5K0.5HfO3 (where x = 0‐0.05 with y = 0.035, and y = 0‐0.07 with x = 0.03) ceramics. Through temperature‐dependent powder X‐ray diffraction (XRD) patterns and Raman spectra, the structural evolution was determined to be Rhombohedral (R, <−125°C)→Rhombohedral + Orthorhombic (R + O, −125°C to 0°C)→Rhombohedral + Tetragonal (R + T, 0 °C to 150°C)→dominating Tetragonal (T, 200°C to Curie temperature (TC)) → Cubic (C, >TC). In addition, the enhanced electrical properties (e.g., a direct piezoelectric coefficient (d33) of ~450 ± 5 pC/N, a conversion piezoelectric coefficient (d33∗) of ~580 ± 5 pm/V, an electromechanical coupling factor (kp) of ~0.50 ± 0.02, and TC~250°C), fatigue‐free behavior, and good thermal stability were exhibited by the ceramics possessing the R‐T phase boundary. This work improves understanding of the physical mechanism behind the R‐T phase boundary in KNN‐based ceramics and is an important step toward their adoption in practical applications.

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“…It is noted that the existence of nanodomains is a common feature of the MPB region [18,19,[25][26][27][28][29][30][31]. It has been reported that the nanodomains, whose size is much smaller than the coherence length of diffraction radiations, scatter waves from individual nanodomains coherently superimposed in diffraction profiles, and cause anisotropic broadening, asymmetries, intensity distribution variation between the peaks, and even new peaks appearance in diffraction patterns [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the nanodomains, whose size is much smaller than the coherence length of diffraction radiations, scatter waves from individual nanodomains coherently superimposed in diffraction profiles, and cause anisotropic broadening, asymmetries, intensity distribution variation between the peaks, and even new peaks appearance in diffraction patterns [31,32]. The adaptive ferroelectric states indicated that the monoclinic phase is just a rhombohedral and/or tetragonal nanodomains-averaged structure, which is not a real phase in the usual thermodynamic sense [26,33].…”

Section: Introductionmentioning

confidence: 99%

A new insight into structural complexity in ferroelectric ceramics

Zeng

Zhou

et al. 2017

J Adv Ceram

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Abstract:The structure of the ferroelectrics has been widely studied in order to pursuing the origin of high electromechanical responses. However, some experiments on structure of ferroelectrics have yielded different results. Here, we report that the controversial phase structure is due to the adaptive diffraction of nanodomains which hides the natural crystal structure, and the electric-field-induced phase transition is that the natural crystal structure reappears due to the coalescent nanodomains or ordering nanodomains by applying a high electric field. The temperature dependence of dielectric constant with different measurement frequencies and X-ray diffraction (XRD) patterns of unpoled, poled, and annealing after poled ceramics in Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 (BNT-BT) ceramics authenticate the statement. These results provide a new insight into the origin of structural complexity in ferroelectric ceramics, which is related to the key role of nanodomains.

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High and Temperature-Insensitive Piezoelectric Strain in Alkali Niobate Lead-free Perovskite

Cited by 307 publications

References 48 publications

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Structural evolution of the R‐T phase boundary in KNN‐based ceramics

A new insight into structural complexity in ferroelectric ceramics

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High and Temperature-Insensitive Piezoelectric Strain in Alkali Niobate Lead-free Perovskite

Cited by 307 publications

References 48 publications

Modifying Temperature Stability of (K,Na)NbO3 Ceramics through Phase Boundary

Modifying Temperature Stability of (K,Na)NbO3 Ceramics through Phase Boundary

Structural evolution of the R‐T phase boundary in KNN‐based ceramics

A new insight into structural complexity in ferroelectric ceramics

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Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary