Mechanical properties enhancement in potassium-sodium niobate lead-free piezoceramics: the impact of chemical modifications

Ramajo, Leandro Alfredo; Castro, Miriam Susana; Fernández, J.F.; Rubio-Marcos, Fernando

doi:10.1007/s10854-016-6168-8

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…We must note that the phase structure depends very little on the La 3+ content (Figure B). The splitting peaks are observed for 0 ≤ x ≤ 0.7, while the single peak occurs at x ≥ 0.75 (Figure B), indicating a phase transition …”

Section: Resultsmentioning

confidence: 98%

“…The splitting peaks are observed for 0 ≤ x ≤ 0.7, while the single peak occurs at x ≥ 0.75 ( Figure 1B), indicating a phase transition. 18 The phase transition generally causes the abnormal variations of e r , which are used to further identify the phase structure. 19 Figure 2 shows the relationship between e r and temperature for temperatures ranging from À150°C to 200°C.…”

Section: Et Almentioning

confidence: 99%

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Temperature stability and electrical properties in La‐doped KNN‐based ceramics

Zhu

et al. 2018

J Am Ceram Soc

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To improve the temperature stability and electrical properties of KNN‐based ceramics, we simultaneously consider the phase boundary and the addition of rare earth element (La), 0.96K0.5Na0.5Nb0.96Sb0.04O3‐0.04(Bi1‐xLax)0.5Na0.5ZrO3 (0 ≤ x ≤ 1.0) ceramics. More specifically, we investigate how the phase boundary and the addition of La3+ affect the phase structure, electrical properties, and temperature stability of the ceramic. We show that increasing the La3+ content leads to a change in phase structure, from a rhombohedral‐tetragonal (R‐T) phase coexistence to a cubic phase. More importantly, we show that the appropriate addition of La3+ (x = 0.2) can simultaneously improve the unipolar strain (from 0.127% to 0.147%) and the temperature stability (i.e., the unipolar strain of 0.147% remains unchanged when T is increased from 25 to 80°C). In addition, we find that the ceramics with x = 0.2 exhibit a large piezoelectric constant (d33) of ~430 pC/N, a high Curie temperature (TC) of ~240°C and a fatigue‐free behavior (after 106 electric cycles). The enhanced electrical properties mostly originate from the easy domain switching, whereas the improved temperature stability can be attributed to the R‐T phase boundary and the appropriate addition of La3+.

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Section: Resultsmentioning

confidence: 98%

Section: Et Almentioning

confidence: 99%