Tuning the dielectric properties of PbNb2O6 perovskite through calcium substitution

Aslam, Sana; Rafique, Hummera; Ramay, Shahid M.; Akhtar, Naadia; Mustafa, Ghulam; Siddig, Abubaker A.; Aziz, Aziz A.

doi:10.1016/j.physb.2022.413840

Cited by 4 publications

(5 citation statements)

References 35 publications

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“…The PbNb 2 O 6 possesses very high phase transition temperature, and it is absent of antiferroelectricity and exhibits weak piezoelectricity. Its existence contributes little to ferroic performance and ECE evolution for these samples 34,35 . Therefore, the influence of second phase to electrical properties can be ignored.…”

Section: Resultsmentioning

confidence: 99%

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Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb_1/2Nb_1/2)O₃–Pb(Mg_1/3Nb_2/3)O₃ system

Li,

Long,

Tan

et al. 2023

J Am Ceram Soc.

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Temperature stability of electrocaloric effect (ECE) is a thorny problem in ferroelectrics (FE). A general method is to design ferroelectric‐to‐relaxor phase transition at a sacrifice of electrocaloric (EC) strength. The Pb(Yb1/2Nb1/2)O3 antiferroelectrics (AFE) + Pb(Mg1/3Nb2/3)O3 relaxors strategy designed in this work is effective to tackle this dilemma [(1 − x)PYN–xPMN, x = 0.08–0.36]. PMN addition induces a successive phase transition and dual phase boundaries of ferrielectric (FIE)‐nonergodic relaxor (NER) and NER‐ergodic relaxor (ER), where ferroelectric polarization/strain and ECE reach a local maximum. Thermally stable ΔT is unexpectedly achieved in FIE (x = 0.14) and NER (x = 0.24), except for a generality for ER state (x = 0.30). A dome‐like variation trend is observed in x = 0.14 and 0.24 with a wide temperature span of ∼60 and ∼55 K (±15%ΔTmax). Notably, x = 0.24 NER possesses a large directly measured ΔTmax ∼0.64 K simultaneously. Dielectric/ferroelectric properties clarify that two‐stage transition of AFE rigid‐order de‐texture and dissociation of de‐textured AFE domains into polar nano‐entities accounts for thermal stability of ΔT as the alternation of ordered antipolar domains to disorder relaxors serves as a buffer to compensate for the thermal‐shock enhanced random field. This work not only accounts for the underlying mechanism for thermal stability of ΔT at FIE and NER side for the first time in physics but also provides an exotic approach to seek for high‐performance EC materials in practical applications.

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Section: Resultsmentioning

confidence: 99%

“…Its existence contributes little to ferroic performance and ECE evolution for these samples. 34,35 Therefore, the influence of second phase to electrical properties can be ignored. To apparently observe the diffraction intensity change in A-site antiparallel and AFE featured peaks, locally magnified peaks are displayed in Figure 1D-H.…”

Section: Introductionmentioning

confidence: 99%

Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb_1/2Nb_1/2)O₃–Pb(Mg_1/3Nb_2/3)O₃ system

Li,

Long,

Tan

et al. 2023

J Am Ceram Soc.

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“…A perovskite structure is formed with a small amount of secondphase PbNb 2 O 6 . In fact, PbNb 2 O 6 with a tetragonal tungsten bronze structure possesses a very high phase transition temperature and is not antiferroelectric, so its existence contributes little to the AFE and EC responses within the studied temperature range [53,54]. Locally magnified diffraction peaks I, II and III are shown in the inset of figure 1(a).…”

Section: Resultsmentioning

confidence: 99%

Order-degree-modulated ferroic response and an unconventional electrocaloric effect in B-site complex systems: a case study in Pb[(Yb_1/2Nb_1/2)_0.84(Mg_1/3Nb_2/3)_0.16]O₃ ceramic

Long

Xiaojie

et al. 2023

J. Phys. D: Appl. Phys.

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Order degree modulated ferroic response and electrocaloric effect (ECE) in Pb(B1, B2)O3–type B–site complex antiferroelectrics (AFEs) are explored in this work. Results show that local/phase structure and dielectric/ferroic properties are strikingly dependent on order degree (high, intermediate and low order degree for S1, S2 and S3 sample, respectively). A decrease in AFE orthorhombic phase and increase in weakly–polar disorder phase content is observed from S1 to S3, accompanying by an enhanced relaxation behavior with a smearing of AFE-to-PE phase transition. Ferroic and EC responses in three samples present distinct features. Antiferroelectricity wakes–up significantly in S1 sample, which boosts ECE up to ~ 0.95 K and is almost three times that of S3 (~ 0.23 K). Besides, abnormal ECE (negative ECE with a hop–hop character and asymmetrical EC response) is unexpectedly found in S1. Underlying mechanism is unveiled by dipolar relaxation and phenomenology analysis, which states that AFE coupling strength dominates the EC performance in this AFE. This work not only presents a refreshing method for order degree regulating ECE in B–site complex AFEs, but also clarifies a possibility that AFEs with robust dipolar coupling strength procure unconventional ECE.

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“…The synthesized powder was then placed into ceramic cups and calcined at 800 °C for 3 h in a Nabertherm furnace to develop a pure phase. 24 This calcined powder was pressed using an Apex hydraulic press to make cylindrical pellets of 7 mm diameter and ∼1 mm thickness by applying a force of 30 kN. All the pellets were then sintered at 350 °C for 1 h to make them hard.…”

Section: Methodsmentioning

confidence: 99%

Gateway toward efficient and miniaturized A₂B₂O₇-type fluorite structure-based energy storage devices

et al. 2023

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Tuning the dielectric properties of PbNb2O6 perovskite through calcium substitution

Cited by 4 publications

References 35 publications

Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb_1/2Nb_1/2)O₃–Pb(Mg_1/3Nb_2/3)O₃ system

Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb_1/2Nb_1/2)O₃–Pb(Mg_1/3Nb_2/3)O₃ system

Order-degree-modulated ferroic response and an unconventional electrocaloric effect in B-site complex systems: a case study in Pb[(Yb_1/2Nb_1/2)_0.84(Mg_1/3Nb_2/3)_0.16]O₃ ceramic

Gateway toward efficient and miniaturized A₂B₂O₇-type fluorite structure-based energy storage devices

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Tuning the dielectric properties of PbNb2O6 perovskite through calcium substitution

Cited by 4 publications

References 35 publications

Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3 system

Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3 system

Order-degree-modulated ferroic response and an unconventional electrocaloric effect in B-site complex systems: a case study in Pb[(Yb1/2Nb1/2)0.84(Mg1/3Nb2/3)0.16]O3 ceramic

Gateway toward efficient and miniaturized A2B2O7-type fluorite structure-based energy storage devices

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Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb_1/2Nb_1/2)O₃–Pb(Mg_1/3Nb_2/3)O₃ system

Successive phase transitions–induced multiple boundaries and unprecedented electrocaloric effect in Pb(Yb_1/2Nb_1/2)O₃–Pb(Mg_1/3Nb_2/3)O₃ system

Order-degree-modulated ferroic response and an unconventional electrocaloric effect in B-site complex systems: a case study in Pb[(Yb_1/2Nb_1/2)_0.84(Mg_1/3Nb_2/3)_0.16]O₃ ceramic

Gateway toward efficient and miniaturized A₂B₂O₇-type fluorite structure-based energy storage devices