Evidence for the suppression of intermediate anti-ferroelectric ordering and observation of hardening mechanism in Na1/2Bi1/2TiO3 ceramics through cobalt substitution

Karthik, T.; Ramadurai, Ranjith; Asthana, Saket

doi:10.1063/1.4862169

Cited by 25 publications

(10 citation statements)

References 29 publications

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“…The XRD patterns of BCZT‐ x Co and BCZT‐ x Fe ceramics are shown in Figure . The results showed that all patterns presented pure perovskite phase without secondary phase which were similar to previous reports on undoped BCZT, Pr‐doped Ba 0.98 Ca 0.02 Zr 0.02 Ti 0.98 O 3 , Fe‐doped BiYbO 3 ‐Pb(Zr,Ti)O 3 and Co‐doped Bi 0.5 Na 0.5 TiO 3 . From Rietveld analysis, the observed peaks for all samples could be indexed as the tetragonal structure with space group P4 mm.…”

Section: Resultssupporting

confidence: 87%

“…Therefore, many studies attempted to investigate how to reduce the sintering temperature by doping the BCZT with other ions such as copper, cobalt, and praseodymium . Recently, it was found that the addition of cobalt oxide (Co 2 O 3 , CoO) or iron oxide (Fe 2 O 3 ) could improve the ferroelectric, dielectric, and piezoelectric properties in CoO‐Bi 0.5 Na 0.5 TiO 3 , Co 2 O 3 ‐Ba 0.95 Pb 0.05 TiO 3 , Co 2 O 3 ‐Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 , Co 2 O 3 ‐BaTiO 3 , Fe 2 O 3 ‐BaZr 0.1 Ti 0.9 O 3 , and Fe 2 O 3 ‐ (Na 0.5 K 0.5 ) 0.96 Li 0.04 Nb 0.86 Ta 0.1 Sb 0.04 O 3 . The purpose of this study is therefore to investigate the effects of CoO and Fe 2 O 3 addition on the physical properties, microstructure, dielectric, ferroelectric, and piezoelectric behaviors which have not been studied before in the BCZT ceramic.…”

Section: Introductionmentioning

confidence: 99%

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Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe₂O₃‐Doped BCZT Ceramics

Jaimeewong

Sittinon

Buntham

et al. 2018

Physica Status Solidi (a)

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This study investigates the effect of CoO and Fe2O3 dopant on phase, microstructure and ferroelectric properties of BCZT ceramics with the formula of Ba0.85Ca0.15Zr0.1(Ti1‐xCox)0.9O3 and Ba0.85Ca0.15Zr0.1(Ti1‐xFex)0.9O3 where x = 0, 0.01, and 0.03. The XRD patterns presented that the pure perovskite phases are observed regardless of the amount of CoO and Fe2O3 added. Rietveld analysis shows that the tetragonal phase is observed in all patterns and the unit cell volume slightly expanded by the CoO addition while it is distorted with increasing Fe2O3 addition. The average grain sizes decreased upon CoO and Fe2O3 addition. It is found that the doping of CoO and Fe2O3 caused the transition temperature to shift to lower temperature. The optimum ferroelectric and dielectric properties can be achieved for the BCZT‐0.01Co ceramics. This study shows that while small doping with Co and Fe can enhance different properties of BCZT with lower processing temperature, the properties should be further optimized by chemical modification.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe₂O₃‐Doped BCZT Ceramics

Jaimeewong

Sittinon

Buntham

et al. 2018

Physica Status Solidi (a)

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“…Figure 2b shows the Raman spectrum for sintered NBT-n and NBT-b ceramics. The observed Raman spectrum for NBT-n is consistent with the reported NBT-b ceramics [16,17]. The four major bands designated as band-A, B, C & D and their corresponding phonon mode assignment is reported in our previous work [16].…”

Section: X-ray Diffraction and Raman Spectroscopy Analysissupporting

confidence: 89%

“…2a. Sol-gel derived NBT-n XRD pattern matches well with the R3c space group as that of the NBT-b as reported in our previous work [16,17]. All the diffraction peaks were compared with the standard diffraction profile (PCPDF supplementary file No.…”

Section: X-ray Diffraction and Raman Spectroscopy Analysissupporting

confidence: 73%

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Sahu

Karthik

Srinivas

et al. 2015

J Mater Sci: Mater Electron

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Polycrystalline Na 0.5 Bi 0.5 TiO 3 (NBT) ceramics were synthesized by using sol-gel and solid state reaction techniques with an average grain size of %240 nm and %14 lm respectively. Structural analysis confirmed the R3c phase-stabilization in both bulk and nano-NBT. The lattice strain analysis estimated by using W-H plot from the XRD profiles revealed the strain was compressive in NBT-nano. Phonon life times (s) of Na/Bi-O, Ti-O and TiO 6 phonon modes were decreased in NBT-nano due to the grain size effect. Microstructure of NBT-nano displayed an enormous rise in the number of grain boundaries than NBT-bulk. Ferroelectric loops became slanted in NBT-nano due to the multi-domain to mono-domain transformation. The mono-domain transition eased the domain reversal and switching, which in-turn lowered the E c value in NBT-nano (i.e. E c = 45 kV/cm). The clamping effect caused by grain size reduction in NBT-nano leads to reduced P r value (P r = 25.2 lC/cm 2 ). The compressive strain developed in the crystal lattice of NBT-nano leads to an increase in T m (i.e. 335°C). The variation in diffusivity parameter (c) and degree of correlation strength q(T) between the polar nano regions were found to be the cause for enhanced relaxor features in NBT-nano.Electronic supplementary material The online version of this article (

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“…Notably, two abnormal temperatures have been reported from electrical experiments for Co modified NBBTx%-based system, which were identified as phase transition temperature of ferroelectric to anti-ferroelectric (T FE−AFE ), and anti-ferroelectric to paraelectric (T AFE−PE ). 6,8,20 In this work, the two abnormal temperatures, from optical ellipsometry and Raman results, are comparable to consequences from electrical experiments. Therefore, the two abnormal temperatures of every x%-Co:NBBT6 crystals can be regarded as T FE−AFE and T AFE−PE , respectively.…”

Section: Resultssupporting

confidence: 67%

Electronic structures and abnormal phonon behaviors of cobalt-modified Na0.5Bi0.5TiO3-6%BaTiO3 single crystals

Huang

Zhang

et al. 2016

AIP Advances

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Optical properties, electronic structures, and structural variations of x wt% cobalt (Co) doped Na0.5Bi0.5TiO3-6%BaTiO3 (x=0%, 0.5%, 0.8%) single crystals have been studied by temperature-dependent optical ellipsometry and Raman spectra from 250 to 650 K. Based on the temperature evolution of electronic transitions (Ecp1 and Ecp2) and the phonon modes involving Ti-O vibrations, two critical temperature points exhibit an increasing trend with Co dopants, which are related to structural variations for ferroelectric to anti-ferroelectric, and anti-ferroelectric to paraelectric transition, respectively. Additionally, distinguishing abnormal phonon behaviors can be observed from Raman spectra for the crystal of x=0.5% and 0.8%, which show reverse frequency shift of the modes involving Ti-O vibration. It can be ascribed to different relative concentration of Co2+ and Co3+ in the crystals, which has been confirmed by X-ray Photoelectron Spectroscopy data.

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Evidence for the suppression of intermediate anti-ferroelectric ordering and observation of hardening mechanism in Na1/2Bi1/2TiO3 ceramics through cobalt substitution

Cited by 25 publications

References 29 publications

Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe₂O₃‐Doped BCZT Ceramics

Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe₂O₃‐Doped BCZT Ceramics

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Electronic structures and abnormal phonon behaviors of cobalt-modified Na0.5Bi0.5TiO3-6%BaTiO3 single crystals

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Evidence for the suppression of intermediate anti-ferroelectric ordering and observation of hardening mechanism in Na1/2Bi1/2TiO3 ceramics through cobalt substitution

Cited by 25 publications

References 29 publications

Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe2O3‐Doped BCZT Ceramics

Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe2O3‐Doped BCZT Ceramics

Structural and microstructural correlation with ferroelectric and dielectric properties of nanostructured Na0.5Bi0.5TiO3 ceramics

Electronic structures and abnormal phonon behaviors of cobalt-modified Na0.5Bi0.5TiO3-6%BaTiO3 single crystals

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Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe₂O₃‐Doped BCZT Ceramics

Ferroelectric, Piezoelectric and Dielectric Behaviors of CoO‐ and Fe₂O₃‐Doped BCZT Ceramics