Enhanced piezoelectric properties of Ta substituted-(K0.5Na0.5)NbO3 films: A candidate for lead-free piezoelectric thin films

Lee, Sun Young; Ahn, Chang Won; Ullah, Aman; Lee, Hai Joon; Hwang, Hak-In; Choi, Jin Sik; Park, Bae Ho; Kim, Ill Won

doi:10.1016/j.jallcom.2011.03.031

Cited by 37 publications

(17 citation statements)

References 29 publications

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“…Being totally different from the poor‐performance one, the loop manifests a well‐saturated shape with steady remnant polarization value of 8–10 μC/cm 2 at the pyrolysis temperature of 500°C. The ferroelectric response is evident in the sample as compared with several earlier investigations of KNN system . It is worth mentioning that a slight deviation upon favorable temperature (only 20°C in this study) may result in a tremendous deterioration on ferroelectric response at 480°C, which can be a valuable guideline to obtain high‐performance KNN films.…”

Section: Resultssupporting

confidence: 60%

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO₃ Films on Nb:SrTiO₃ Substrates

Chen

et al. 2013

J. Am. Ceram. Soc.

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Lead-free (K,Na)NbO 3 (KNN) piezoelectric films were fabricated on Nb:SrTiO 3 substrates by sol-gel process, and the influence of thermal processing details on the microstructure and ferroelectric property was investigated. Experimental results confirmed the different appearance of polycrystalline growth and epitaxial growth modes during the crystallization of KNN thin films. These two growth modes occurred under different thermal conditions within the narrow pyrolysis temperature scope ranging from 400°C to 500°C, respectively. By considering these findings, an optimizing combination between pyrolysis and annealing procedure was thought to be crucially important to obtain high-performance KNN films with excellent crystallization state.

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Section: Resultssupporting

confidence: 60%

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO₃ Films on Nb:SrTiO₃ Substrates

Chen

et al. 2013

J. Am. Ceram. Soc.

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“…For example, they suggest that the response of KNN may be enhanced through modifications that increase the bond frustration in these materials. One possibility may be through chemical pressure induced by the introduction of a larger cation such as Ta [41].…”

Section: Discussionmentioning

confidence: 99%

Special quasirandom structures to study the(K0.5Na0.5)NbO3random alloy

et al. 2014

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The local structure of K0.5Na0.5NbO3 is investigated using first-principles methods with an optimized special quasirandom structure (SQS). Through a comparison of the computed pair distribution functions with those from neutron powder diffraction data, the SQS approach demonstrates its ability to accurately capture the local structure patterns derived from the random distribution of K and Na on the perovskite Asite. Using these structures, local variations in Na-O interactions are suggested to be the driving force behind the R3c to Pm phase transition. A comparison between the SQS and a rocksalt structure shows the inability of the latter to account for the local variability present in a random solid solution. As such, the predictive nature of the SQS demonstrated here suggests that this approach may provide insight in understanding the properties of a wide range of bulk oxide alloys or solid solutions. Disciplines Polymer and Organic Materials | Process Control and Systems | Structural Materials CommentsThis article is from Physical Review B 90 (2014) The local structure of K 0.5 Na 0.5 NbO 3 is investigated using first-principles methods with an optimized special quasirandom structure (SQS). Through a comparison of the computed pair distribution functions with those from neutron powder diffraction data, the SQS approach demonstrates its ability to accurately capture the local structure patterns derived from the random distribution of K and Na on the perovskite A-site. Using these structures, local variations in Na-O interactions are suggested to be the driving force behind the R3c to P m phase transition. A comparison between the SQS and a rocksalt structure shows the inability of the latter to account for the local variability present in a random solid solution. As such, the predictive nature of the SQS demonstrated here suggests that this approach may provide insight in understanding the properties of a wide range of bulk oxide alloys or solid solutions.

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“…So, according to the XRD patterns, the piezoelectric response increases with the increase in the F factor of KNNT thin films and films with high preferential (001) orientation exhibit large piezoelectric coefficient. For PZT thin films, the d 33,f value varies from 10 to 110 pm/V [27][28] [29] and for KNLNT thin films produced by PLD the piezoelectric coefficient d 33,f = 49 pm/V [30]. These results indicate that KNNT thin films are good candidates for lead-free piezoelectric thin films.…”

Section: Resultsmentioning

confidence: 83%

Effect of A-site Excess on the Piezoelectric Properties of (K_0.48Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃Thin Films

Park

Lee

et al. 2014

Ferroelectrics

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Lead-free polycrystalline (K 0.48 Na 0.52 ) 1+x (Nb 0.55 Ta 0.45 )O 3 (x = 0, 0.01, 0.02 and 0.03) thin films have been grown on Pt(111)/Ti/SiO 2 /Si substrates using KrF excimer laser ablation to investigate the effects of A-site ion excess. The film at x = 0.01 exhibited good ferroelectric hysteresis loop with a remnant polarization 2P r of 30 μC/cm 2 and coercive field 2E c of 61 kV/cm. The piezoelectric coefficient d 33,f of the KNNT film with x = 0.01 was found to amount to 79 pm/V. These improved ferroelectric and piezoelectric properties were attributed to the excess of A-site Na and K ions.

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Enhanced piezoelectric properties of Ta substituted-(K0.5Na0.5)NbO3 films: A candidate for lead-free piezoelectric thin films

Cited by 37 publications

References 29 publications

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO₃ Films on Nb:SrTiO₃ Substrates

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO₃ Films on Nb:SrTiO₃ Substrates

Special quasirandom structures to study the(K0.5Na0.5)NbO3random alloy

Effect of A-site Excess on the Piezoelectric Properties of (K_0.48Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃Thin Films

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Enhanced piezoelectric properties of Ta substituted-(K0.5Na0.5)NbO3 films: A candidate for lead-free piezoelectric thin films

Cited by 37 publications

References 29 publications

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO3 Films on Nb:SrTiO3 Substrates

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO3 Films on Nb:SrTiO3 Substrates

Special quasirandom structures to study the(K0.5Na0.5)NbO3random alloy

Effect of A-site Excess on the Piezoelectric Properties of (K0.48Na0.52)1+x(Nb0.55Ta0.45)O3Thin Films

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Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO₃ Films on Nb:SrTiO₃ Substrates

Effect of Pyrolysis Temperature on Sol–Gel Synthesis of Lead‐free Piezoelectric (K,Na)NbO₃ Films on Nb:SrTiO₃ Substrates

Effect of A-site Excess on the Piezoelectric Properties of (K_0.48Na_0.52)_1+x(Nb_0.55Ta_0.45)O₃Thin Films