(Bi0.5Na0.5)ZrO3 modified KNN-based ceramics: Enhanced electrical properties and temperature insensitivity

Shi, Caiyun; Ma, Jian; Wu, Jiajin; Chen, Kui; Wu, Bo

doi:10.1016/j.ceramint.2019.09.271

Cited by 25 publications

(5 citation statements)

References 24 publications

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“…The poling strain ( S pol = S neg + S pos ) and negative strain ( S neg ) first increase and then decrease (Figure a,b), but the positive strain ( S pos ) and unipolar strain ( S uni ) gradually decrease (Figure c,d). Despite the reduced S uni , samples with x = 0.05–0.10 still show relatively high S uni values (∼0.155%) at E = 40 kV/cm, comparable to that of other high-performance KNN-based ceramics (Figure e). − Therefore, as we expected, appropriately replacing (Bi 0.5 Na 0.5 ) 2+ with Ba 2+ does remain with high strain properties. In particular, both relatively high S uni and d 33 values make samples with x = 0.10 comparable to other notable KNN-based ceramics with MPC (Figure e), indicating the promising potential for practical applications.…”

Section: Resultssupporting

confidence: 59%

“…Despite the reduced Suni, samples with x=0.05-0.10 still show relatively high Suni values (~0.155%) at E=40 kV/cm, comparable to that of other highperformance KNN-based ceramics (Figure 7(e)). [32][33][34][35][36][37][38][39][40][41][42][43] Therefore, as we expected, appropriately replacing (Bi0.5Na0.5) 2+ with Ba 2+ does remain high strain properties. In particular, both relatively high For the same composition, the higher electric fields endow Suni with the weaker temperature dependency, which is due to the dominating contribution from the converse piezoelectric response and decreased contribution from domain switching at high electric fields.…”

Section: Electrical and Strain Propertiesmentioning

confidence: 94%

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Tuning the Covalency of A–O Bonds to Improve the Performance of KNN-Based Ceramics with Multiphase Coexistence

Zhang

2020

ACS Appl. Mater. Interfaces

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Although a room-temperature multiphase coexistence (MPC) strategy improves the piezoelectric coefficient (d33) of potassium sodium niobate ((K, Na)NbO3, KNN) ceramics, it still suffers from the dependencies on composition and temperature, making it remain challenging to further improve d33 and temperature stability of strain for an already-built MPC. Here we proposed a new route to resolve this issue, that is, tuning the covalency of A-O bonds in an already-built MPC. We chose 0.96(Na0.60K0.40)(Nb0.955Sb0.045)O3-0.04(Bi0.5Na0.5)ZrO3 ceramics as an already-built MPC and replaced (Bi0.5Na0.5) 2+ with Ba 2+ to tune the covalency of A-O bonds. Thus, we synthesized 0.96(Na0.60K0.40)(Nb0.955Sb0.045)O3-0.04(Bi0.5Na0.5)1-xBaxZrO3 ceramics. We not only improved d33 values from 450 pC/N (at x=0) to 500-505 pC/N (at x=0.05-0.10) but also obtained the enhanced temperature stability for strain at x=0.10, outperforming that of samples with x=0 and other KNNbased ceramics. The increased d33 is attributed to the well-preserved MPC and the repaired long-range ordering (LRO), and the improved temperature stability of strain is due to shifting the MPC to a slightly higher temperature than room temperature. Therefore, the new route is useful to further improve the 2 performance of an already-built MPC, benefitting to the future design of MPC and the practical application of KNN-based ceramics.

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Section: Resultssupporting

confidence: 59%

Section: Electrical and Strain Propertiesmentioning

confidence: 94%

Tuning the Covalency of A–O Bonds to Improve the Performance of KNN-Based Ceramics with Multiphase Coexistence

Zhang

2020

ACS Appl. Mater. Interfaces

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“…90,92,233,266,276,[278][279][280][281][282][283][284] KNN-based ceramics with nano-domains exhibited the much higher Sneg than those of the ones with microndomains, while KNN-based ceramics comprised of PNRs display the negligible Sneg. 90,92,233,266,276,[278][279][280][281][282][283][284] Except for the composition-induced variation of domain size, the grain size also affects the domain size according to Equation (1). Thus, Zhai et al used the combined methods to control the grain size of 95KNNS-1CZ-4BKHT ceramics and measured their bipolar strain curves (see Figure 15(a)).…”

Section: Nano-domain Vs Strain Propertiesmentioning

confidence: 97%

“…With the increasing content of additives, the phase structure firstly changes from a pure O phase to a multi-phase coexistence (e.g., O-T, R-O-T, or R-T) and finally becomes a pseudo-cubic (or relaxor) phase. 90,92,233,266,276,[278][279][280][281][282][283][284] The corresponding domain structure undergoes the evolution like that of KNNS-SZ-xBNZ ceramics. Here we collected the Sneg of PBE-modified KNN-based ceramics where the different domain sizes are reasonably anticipated (see Figure 14).…”

Section: Nano-domain Vs Strain Propertiesmentioning

confidence: 99%