Effect of lanthanum doping on the structural, ferroelectric, and strain properties of Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Dinh, Hinh T.; Lee, Hyun‐Young; Yoon, Chang-Ho; Malik, Rizwan Ahmed; Kong, Young‐Min; Lee, Jae‐Shin; Tran, Vu Diem Ngoc

doi:10.3938/jkps.62.1004

Cited by 49 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The density of the sintered samples, with different atomic concentrations of La (0, 0.003, 0.007, 0.01, 0.013, 0.033, and 0.067) was determined by the Archimedes method. The results presented in Table 1 A similar effect of grain size reduction has also been observed in other ferroelectric systems in addition to BNT, such as in the case of BaTiO3 and PZT [25][26][27]. The effect of La doping in the A sites of the BNT perovskite structure, substituting Na and Bi, leads to a decrease in grain size, and for higher concentrations, it is expected also that it contributes to the appearance of an additional phases [25][26][27].…”

Section: Microstructural Analysessupporting

confidence: 71%

Structural, Ferroelectric, Pyroelectric, and Dielectric Study of Bi0.5Na0.5TiO3 Ceramics synthesized with Precursors Obtained by Sol-Gel Method doped with Lanthanum

Serralta-Macías1

Calderón-Piñar

Zaldivar

et al. 2021

Preprint

View full text Add to dashboard Cite

In this work, the ferroelectric, pyroelectric and dielectric properties of La-doped bismuth sodium titanate ceramics (BNLT) using amounts from 0 to 6.7 at.% La were studied. The precursor powders used to make dense BNLT ceramics were obtained by the sol-gel method using the acetic acid route. All samples were calcined at 700°C for 1hr and sintered at 1150°C for 30 min in an encapsulated crucible to avoid Na and Bi volatilization, obtaining relative densities equal or higher than 94%. The obtained X-ray diffraction patterns typical of the perovskite structure, confirm the incorporation of lanthanum into the lattice, evolving from rhombohedral phase to a mixture of rhombohedral and cubic structure for higher concentrations. Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) results indicate that the crystallization of precursors powders of BNT takes place between 500 and 700°C. Additionally, the Scanning Electron Microscopy (SEM) micrographs reveal a decrement of grain size from 4.5 to 0.5 μm with increasing La content. The ferroelectric hysteresis curves show that the best ferroelectric properties were obtained for BNT 1.3% La, where the obtained values of remnant polarization and coercive field were Pr=29 μC/cm2 and Ec=39 kV/cm respectively. Also, at this concentration, the pyroelectric response shows the higher value, 4 times the pyroelectric signal of the pure BNT.

show abstract

Section: Microstructural Analysessupporting

confidence: 71%

Structural, Ferroelectric, Pyroelectric, and Dielectric Study of Bi0.5Na0.5TiO3 Ceramics synthesized with Precursors Obtained by Sol-Gel Method doped with Lanthanum

Serralta-Macías1

Calderón-Piñar

Zaldivar

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…[8][9][10][11][12] Other studies focused on either A-and/or B-site doping to improve small and large signal electromechanical properties. [13][14][15][16] It was proved that either replacing Bi on the A-site 16 or all A-site cations are effective approaches. 13 Compositional modifications with iso-and aliovalent dopants are technologically relevant because small doping amounts can modify considerably electrical properties due to cation vacancy formation and chemical pressure.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16] It was proved that either replacing Bi on the A-site 16 or all A-site cations are effective approaches. 13 Compositional modifications with iso-and aliovalent dopants are technologically relevant because small doping amounts can modify considerably electrical properties due to cation vacancy formation and chemical pressure. Specifically, La was widely used in several archetypal perovskite materials such as Pb(Zr,Ti)O 3 , and Ba 1/2 Na 1/2 TiO 3 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

Acosta

Liu

Deluca

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

Articles you may be interested inSolid-state conversion of (Na1/2Bi1/2)TiO3-BaTiO3-(K1/2Na1/2)NbO3 single crystals and their piezoelectric properties Appl. Phys. Lett. 104, 222910 (2014) The morphotropic phase boundary composition Bi 1/2 Na 1/2 TiO 3 -20 mol. % Bi 1/2 K 1/2 TiO 3 was chosen as initial material to do selective A-site aliovalent doping replacing Na and K by 1 at. % La, respectively. The materials were studied macroscopically by measuring dielectric and electromechanical properties. The Na-replaced material has a lower freezing temperature T fr , lower remanent polarization and remanent strain, and thus a higher degree of ergodicity than the K-replaced material. These results are contrasted with local poling experiments and hysteresis loops obtained from piezoresponse force microscopy. The faster relaxation of the tip-induced local polarization and the lower remanent state in bias-on and -off loops confirm the higher degree of ergodicity of the Na-replaced material. The difference in functional properties is attributed to small variations in chemical pressure achieved through selective doping. Raman results support this working hypothesis. V C 2015 AIP Publishing LLC.[http://dx

show abstract

“…In case of La, Nb co-modi cation, 1 mol% of La and Nb co-modi cation partially replace the cations of A and B-site of the host BNKT-ST piezoceramics respectively, due to their comparable ionic sizes. La +3 will act as A-site donor [20] and Nb +5 [13] as B-site donor, and likely to produce A-site vacancies. The produced vacancies may enhance the local random eld and break down the long-range FE order by enhancing local random elds along with four current peaks.…”

Section: Resultsmentioning

confidence: 99%

Comparison of strain and ferroelectric properties of La,Nb and Li,Nb co-modified BNKT–ST ceramics

Malik¹,

Maqbool²,

Khan³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

A comparison between the influence of concurrent A and B-site acceptor-donor (Li,Nb) and donor-donor (La,Nb) doping in Pb-free Bi 0.5 (Na 0.84 K 0.16 ) 0.5 TiO 3 –SrTiO 3 piezoelectrics on structure, ferroelectric and high voltage induced strain were made. In this work, Lithium was chosen as acceptor and Lanthanum was chosen as donor dopant on A-site and Nb 5+ as a B-site donor. Both modifier impurities promoted a phase evolution from the coexistent of two phase structures (rhombohedral-tetragonal) into a more symmetric single pseudocubic structure. Nonetheless, (La,Nb) donor-donor doping induced the phase transition at 1 mol%, while (Li,Nb) acceptor-donor doping at 2 mol%. Interestingly, acceptor-donor (Li,Nb) co-substitution results in the broadening of ergodic relaxor and ferroelectric (ER-FE) mixed phase boundary which is favourable for multidevice applications. This comparative study show that the A-site vacancies play a substantial role to induce the phase transformation from nonergodic-ergodic relaxor (NR-ER) and the improvement in their high voltage induced strain.

show abstract

Effect of lanthanum doping on the structural, ferroelectric, and strain properties of Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

Cited by 49 publications

References 29 publications

Structural, Ferroelectric, Pyroelectric, and Dielectric Study of Bi0.5Na0.5TiO3 Ceramics synthesized with Precursors Obtained by Sol-Gel Method doped with Lanthanum

Structural, Ferroelectric, Pyroelectric, and Dielectric Study of Bi0.5Na0.5TiO3 Ceramics synthesized with Precursors Obtained by Sol-Gel Method doped with Lanthanum

Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

Comparison of strain and ferroelectric properties of La,Nb and Li,Nb co-modified BNKT–ST ceramics

Contact Info

Product

Resources

About