Effects of Iron Addition on Electrical Properties and Aging Behavior of Barium Titanate Ceramics

Tangsritrakul, Jirapa; Unruan, Muangjai; Ketsuwan, P.; Triamnak, Narit; Rujirawat, Saroj; Dechakupt, Tanawadee; Anata, Supon; Yimnirun, Rattikorn

doi:10.1080/00150190902889408

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…V B. Such changes with respect to dopant concentra-tion is perhaps the most notable phenomenon observed and reported in experimental work 22,40,41,55,56 .…”

Section: A Hysteresis Loopmentioning

confidence: 64%

“…In experimental investigations of doped systems, three phenomena are often observed as the consequences of doping: (i) Strong change of the hysteresis loop; (ii) Diffused and/or smeared dielectric permittivity with respect to temperature; (iii) Variations of phase transition temperatures 24,25,[30][31][32][33][34][35][36][37] . Moreover, it is also known from experiments that doping Fe or Mn into BaTiO 3 in general makes ferroelectric materials easier to reverse [38][39][40][41] . Since the doping effects can be significant even with minuscule doping, the origin of such effects naturally attracts great scientific attention.…”

Section: Introductionmentioning

confidence: 99%

“…Since the doping effects can be significant even with minuscule doping, the origin of such effects naturally attracts great scientific attention. Different explanations have been proposed to understand the mechanism of doping effects, including (i) Oxygen vacancies and free charges on the doped lattice point 10,[12][13][14][41][42][43] ; (ii) Local strains [44][45][46] ; (iii) Domains induced by dopants [9][10][11]47 . In the present work, we propose a computationally tractable model where the dipoles associated with Fe-doped lattice sites and their nearest neighbors are suppressed.…”

Section: Introductionmentioning

confidence: 99%

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Understanding doped perovskite ferroelectrics with defective dipole model

Liu

Jin

Jiang

et al. 2018

The Journal of Chemical Physics

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While doping is widely used for tuning physical properties of perovskites in experiments, it remains a challenge to exactly know how doping achieves the desired effects. Here, we propose an empirical and computationally tractable model to understand the effects of doping with Fe-doped BaTiO 3 as an example. This model assumes that the lattice sites occupied by Fe ion and its nearest six neighbors lose their ability to polarize, giving rise to a small cluster of defective dipoles. Employing this model in Monte-Carlo simulations, many important features like reduced polarization and the convergence of phase transition temperatures, which have been observed experimentally in acceptor doped systems, are successfully obtained. Based on microscopic information of dipole configurations, we provide insights into the driving forces behind doping effects and propose that active dipoles, which exist in proximity to the defective dipoles, can account for experimentally observed phenomena. Close attention to these dipoles are necessary to understand and predict doping effects.

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“…V B. Such changes with respect to dopant concentra-tion is perhaps the most notable phenomenon observed and reported in experimental work 22,40,41,55,56 .…”

Section: A Hysteresis Loopmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Understanding doped perovskite ferroelectrics with defective dipole model

Liu

Jin

Jiang

et al. 2018

The Journal of Chemical Physics

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show abstract

“…In polar metallic phase, as shown in phase II of Fig. 1, charge carriers can propagate freely in materials as soon as the global P and correspondingly the total electric field E is fully screened by δ c1 ~2% of carriers accumulating on the domain boundaries and surfaces 36,37 . On the other hand, the FE order having a spontaneously broken symmetry still exists up to δ c2 ~10% [12][13][14]16,18,20,23,24 , despite the absence of the global P. Naturally, with the screening of the beneficial E, ferroelectricity is expected to be weakened as widely found in current observations, for example, a decrease in phase transition temperatures (T c ) and coercive field (E c ) [12][13][14]32,38,39 , a remarkably reduced off-center FE distortions [12][13][14] , a softening of the soft mode phonon 39 and an emergence of the over-damped highly-anharmonic central mode 39,40 .…”

Section: Introductionmentioning

confidence: 99%

Quantum fluctuation of ferroelectric order in polar metals

Gu,

Wang,

Lang

et al. 2023

npj Quantum Mater.

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The polar metallic phase is an unusual metallic phase of matter containing long-range ferroelectric (FE) order in the electronic and atomic structure. Distinct from the typical FE insulating phase, this phase spontaneously breaks the inversion symmetry without global polarization. Unexpectedly, the FE order is found to be dramatically suppressed and destroyed at moderate ~ 10% carrier density. Here, we propose a general mechanism based on carrier-induced quantum fluctuations to explain this puzzling phenomenon. The quantum kinetic effect would drive the formation of polaronic quasi-particles made of the carriers and their surrounding dipoles. The disruption in dipolar directions can therefore weaken or even destroy the FE order. We demonstrate such polaron formation and the associated FE suppression via a concise model using exact diagonalization, perturbation, and quantum Monte Carlo approaches. This quantum mechanism also provides an intuitive picture for many puzzling experimental findings, thereby facilitating new designs of multifunctional FE electronic devices augmented with quantum effects.

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“…In polar metallic phase, as shown in phase II of Fig. 1, charge carriers can propagate freely in materials as soon as the global P and correspondingly the total electric field E is fully screened by δ c1 ∼ 2% of carriers accumulating on the domain boundaries and surfaces 27,28 . On the other hand, the FE order having a spontaneously broken symmetry actually still exists up to δ c2 ∼ 10% 11-13, 15, 17, 20, 21, 29 , despite the absence of the global P. Naturally, with the screening of the beneficial E, ferroelectricity is expected to be weakened as widely found in current observations, for example, a decrease in phase transition temperatures (T c ) and coercive field (E c ) [11][12][13][30][31][32] , a remarkably reduced off-center FE distortions [11][12][13] , a softening of the soft mode phonon 31 and an emergence of the over-damped highly-anharmonic central mode 31,33 .…”

Section: Introductionmentioning

confidence: 99%

Quantum fluctuation of ferroelectric order in polar metals

Wang

Lang

et al. 2023

Preprint

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The polar metallic phase is an unusual metallic phase of matter containing long-range ferroelectric (FE) order in the electronic and atomic structure. Distinct from the typical FE insulating phase, this phase spontaneously breaks the inversion symmetry without global polarization. Unexpectedly, the FE order is found to be dramatically suppressed and destroyed at moderate ∼10% carrier density. Here, we propose a general mechanism based on carrier-induced quantum fluctuations to explain this puzzling phenomenon. The quantum kinetic effect would drive the formation of polaronic quasi-particles made of the carriers and their surrounding dipoles. The disruption in dipolar directions can therefore weaken or even destroy the FE order. We demonstrate such polaron formation and the associated FE suppression via a concise model using exact diagonalization, perturbation, and quantum Monte Carlo approaches. This quantum mechanism also provides an intuitive picture for many puzzling experimental findings, thereby facilitating new designs of multifunctional FE electronic devices augmented with quantum effects.

show abstract

Effects of Iron Addition on Electrical Properties and Aging Behavior of Barium Titanate Ceramics

Cited by 13 publications

References 10 publications

Understanding doped perovskite ferroelectrics with defective dipole model

Understanding doped perovskite ferroelectrics with defective dipole model

Quantum fluctuation of ferroelectric order in polar metals

Quantum fluctuation of ferroelectric order in polar metals

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