Effect of La Doping on the Dielectric and the Ferroelectric Properties of Lead-Free Na1/2Bi1/2TiO3 (NBT) Ferroelectric Ceramics

Kim, Saes Byul; Choi, Byung Chun; Jeong, Jung Hyun; No, Young Woo; Chung, Su Tae; Son, Se Mo

doi:10.3938/jkps.54.911

Cited by 8 publications

(4 citation statements)

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“…As such, lead free ceramics have attracted considerable attention. The Na 0.5 Bi 0.5 TiO 3 (NBT) and NBT based system with ABO 3 perovskite structure is one of important lead-free based materials [4][5][6][7]. NBT has a high Curie temperature (T c =320°C) and possesses strong ferroelectricity, exhibiting a relatively large polarization (P r =38 µC/cm 2 ) and high coercive field (E c =73 kV/cm) at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…NBT had two phase transitions; it has anti ferroelectric phase below 200°C and paraelectric phase at 320°C. Recently, the effect of doping in NBT [5][6][7] and several solid solutions to improve the properties of NBT have been investigated. It has been reported that NBT -based ceramics with their compositions modified with the addition of BaTiO 3 [8], BiFeO 3 [9], NaNbO 3 [10], CeO 2 [11], MnO 2 [12].…”

Section: Introductionmentioning

confidence: 99%

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Low- Frequency Dielectric Dispersion and Impedance Spectroscopy of Lead-Free Na0.5 Bi0.5 Tio3 (NBT) based Ferroelectric Ceramic

Tilak¹

2012

J Material Sci Engg

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low- Frequency Dielectric Dispersion and Impedance Spectroscopy of Lead-Free Na0.5 Bi0.5 Tio3 (NBT) based Ferroelectric Ceramic

Tilak¹

2012

J Material Sci Engg

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“…Indexing of all peaks of the XRD pattern has been carried out by taking 2h and intensity value of each peak using the standard computer software 'POWD' [12]. The XRD peaks are in good agreement with those previously reported for NBT, which indicate that a NBT single phase with ABO 3 perovskite structure has been formed [13]. The good agreement between the observed and calculated interplanar spacing (d) and Bragg angles is found for the rhombohedral crystal structure (space group: R3c).…”

Section: Xrd and Structural Propertiesmentioning

confidence: 95%

Structural, dielectric and ferroelectric properties of lead-free Na0.5Bi0.5TiO3 ceramics prepared by spark plasma sintering technique

et al. 2015

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Lead-free Na 0.5 Bi 0.5 TiO 3 (NBT) fine-grained ceramics were prepared by spark plasma sintering method. Single phase ceramics with an ABO 3 perovskite structure were confirmed by X-ray diffraction method. The grain morphology was analyzed by using a scanning electron micrograph. The crystal particles arranged compactly and the typical grain size was about &200 nm. The depolarization temperature T d , the rhombohedral-tetragonal phase transition temperature T R-T and the temperature T m of the maximum dielectric constant corresponding to tetragonal-cubic phase transition were determined to be 453 K, approximately 623 and 793 K, respectively, from the temperature dependence of dielectric properties. The P-E hysteresis loop at different temperatures indicated the existence of antiferroelectric state at the depolarization temperature T d, which explained the antiferroelectric phase above T d . The values of P s , P r and E c reduced slightly with increasing temperature in the range 303-453 K.

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“…Raman results show areduction in oxygen vacancies with the introduction of La. Then, the reduction in losses at lower La concentration, imply a reduction in electrical conductivity until 1.3% of La, and the interpretation of the reduction of oxygen vacancies is reinforced[48,49].…”

mentioning

confidence: 91%

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

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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.

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Effect of La Doping on the Dielectric and the Ferroelectric Properties of Lead-Free Na1/2Bi1/2TiO3 (NBT) Ferroelectric Ceramics

Cited by 8 publications

References 0 publications

Low- Frequency Dielectric Dispersion and Impedance Spectroscopy of Lead-Free Na0.5 Bi0.5 Tio3 (NBT) based Ferroelectric Ceramic

Low- Frequency Dielectric Dispersion and Impedance Spectroscopy of Lead-Free Na0.5 Bi0.5 Tio3 (NBT) based Ferroelectric Ceramic

Structural, dielectric and ferroelectric properties of lead-free Na0.5Bi0.5TiO3 ceramics prepared by spark plasma sintering technique

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

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