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Sagayama, Hajime; Toyoda, Satoshi; Sugimoto, Kunihisa; Maeda, Youichi; Yamada, Shigeki; Arima, T.

doi:10.1103/physrevb.90.241113

Cited by 25 publications

(28 citation statements)

References 24 publications

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“…Among them, the charge‐ordering‐induced ferroelectricity, also named as electric ferroelectricity, is almost a common dielectric phenomenon in transition‐metal oxides. This mechanism involves a change in electronic structure which breaks the space‐inversion symmetry giving rise to a macroscopic polarization . Since oxygen vacancies are the predominant charge carriers in the high‐temperature range, it is natural to anticipate that the observed relaxor behavior might be related to the oxygen‐vacancy‐ordering.…”

Section: Resultsmentioning

confidence: 99%

“…This mechanism involves a change in electronic structure which breaks the space-inversion symmetry giving rise to a macroscopic polarization. 48,49 Since oxygen vacancies are the predominant charge carriers in the hightemperature range, it is natural to anticipate that the observed relaxor behavior might be related to the oxygenvacancy-ordering. Evidence supporting this inference comes from the thermal analysis.…”

Section: Resultsmentioning

confidence: 99%

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Relaxor‐like behaviors in Na_1/2Bi_1/2Cu₃Ti₄O₁₂ ceramics

Wang

Sun

et al. 2017

J Am Ceram Soc

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Dielectric properties of Na1/2Bi1/2Cu3Ti4O12 ceramics were evaluated over the temperature range 300‐720 K. Two relaxor‐like dielectric anomalies were found. The low‐temperature anomaly was confirmed to be an oxygen‐vacancy‐related relaxation process. It is a pseudo‐relaxor behavior caused by a bulk relaxation and a Maxwell‐Wagner relaxation. The high‐temperature one was evidenced to be an electric ferroelectric phase‐transition process resulting from the oxygen‐vacancy ordering.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Relaxor‐like behaviors in Na_1/2Bi_1/2Cu₃Ti₄O₁₂ ceramics

Wang

Sun

et al. 2017

J Am Ceram Soc

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“…The structural refinement yields large charge segregation in the HT-CO phase at 300 K (about 80% of the nominal value) that has decreased significantly in the LT-CO phase. The noncentrosymmetric structure is confirmed for the LT-CO phase, thought in this refinement the main polar contribution arises from shifts of the basal oxygens in the MnO 6 octahedra [26]. With this structural information new DFT calculations were performed in addition to grouptheory methods in order to explore competitive phases and the origin of the polar state [3].…”

Section: Introductionmentioning

confidence: 85%

“…A recent study [26] of single-crystal x-ray diffraction analyzes the diffraction patterns at 300 and 150 K using the SGs determined by the CBED technique. In both models there are two nonequivalent Mn sites and the results are evaluated as a composition of two modes: Q2 (Jahn-Teller) and Q3 (breathing).…”

Section: Introductionmentioning

confidence: 99%

Symmetry mode analysis of distorted polar/nonpolar structures in A -site ordered SmBaMn2O6 perovskite

et al. 2021

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We present a comprehensive structural study of the charge-orbital ordering and magnetic phase transitions observed in the A-site ordered SmBaMn 2 O 6 perovskite combining synchrotron radiation x-ray powder diffraction and symmetry-adapted modes analysis. In SmBaMn 2 O 6 , successive phase transitions in charge, spin, and lattice degrees of freedom take place with decreasing temperature at T CO1 ≈ 380 K, T CO2 ≈ 190 K, and T N ≈ 250 K. The main difference between the two charge-ordered phases concerns the stacking sequence along the c axis, which is double for the high temperature charge-ordered phase and has led to controversy in the literature. We show that both charge-ordered phases are pseudosymmetric with respect to the ideal undistorted tetragonal structure of A-site ordered RBaMn 2 O 6 perovskites and lead to two nonequivalent Mn sites. However, the charge segregation stabilizes at about 0.35e − in the low temperature charge-ordered phase, clearly below the nominal separation of one charge unit between Mn 3+ and Mn 4+ and undergoes a prominent increase in the high temperature charge-ordered phase when warming above ≈250 K. The two Mn sites are anisotropic in both charge-ordered phases but the analysis of the active modes discloses that only the low temperature charge-ordered phase displays a Jahn-Teller-like distortion for one of the Mn sites. In addition, this low temperature charge-ordered phase has polar symmetry compatible with ferroelectricity along the a axis.

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“…Instead of a change in crystal structure, the mechanism of such ferroelectric behavior involves a change in electronic structure that breaks the space-inversion symmetry giving rise to a macroscopic polarization. 33,37 Therefore, the P2 peak can be reasonably ascribed to an electric-ferroelectric phase transition. The relaxation-type P3 peak appears in the temperature range higher than T m and can be clearly seen in the modulus spectra (see Figure 1F,I).…”

Section: Resultsmentioning

confidence: 98%

Tuning oxygen vacancy in LiNbO₃ single crystals for prominent memristive and dielectric behaviors

Wang

Sun

et al. 2019

J Am Ceram Soc

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Understanding and manipulating the behavior of oxygen vacancy in oxide materials are of vital importance for rejuvenating materials with novel functionalities. We herein report a exciting phenomenon of oxygen vacancies changing from an isolated state to a clustered state in LiNbO3 single crystals. The clustering of the oxygen vacancies induces a relaxor‐like dielectric anomaly and a first‐order phase transition. The relaxor‐like dielectric anomaly was argued to be a pseudo‐relaxor behavior resulting from the combined contributions of a dipolar relaxation and a Maxwell‐Wagner relaxation. The first‐order phase transition was ascribed to be an electric‐ferroelectric phase transition. Interestingly, a well‐defined melting point of the oxygen‐vacancy clusters was observed. At temperatures near the point, a small dc field can lead to resistance switching from a high resistance state to a low resistance state, yielding a prominent memristive effect with the OFF/ON ratio of 102. Our results underscore that controlling the oxygen vacancy state is a promising strategy to tailor the properties of oxides for novel device applications.

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Ferroelectricity driven by charge ordering in theA-site ordered perovskite manganiteSmBaMn2O6

Cited by 25 publications

References 24 publications

Relaxor‐like behaviors in Na_1/2Bi_1/2Cu₃Ti₄O₁₂ ceramics

Relaxor‐like behaviors in Na_1/2Bi_1/2Cu₃Ti₄O₁₂ ceramics

Symmetry mode analysis of distorted polar/nonpolar structures in A -site ordered SmBaMn2O6 perovskite

Tuning oxygen vacancy in LiNbO₃ single crystals for prominent memristive and dielectric behaviors

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Ferroelectricity driven by charge ordering in theA-site ordered perovskite manganiteSmBaMn2O6

Cited by 25 publications

References 24 publications

Relaxor‐like behaviors in Na1/2Bi1/2Cu3Ti4O12 ceramics

Relaxor‐like behaviors in Na1/2Bi1/2Cu3Ti4O12 ceramics

Symmetry mode analysis of distorted polar/nonpolar structures in A -site ordered SmBaMn2O6 perovskite

Tuning oxygen vacancy in LiNbO3 single crystals for prominent memristive and dielectric behaviors

Contact Info

Product

Resources

About

Relaxor‐like behaviors in Na_1/2Bi_1/2Cu₃Ti₄O₁₂ ceramics

Relaxor‐like behaviors in Na_1/2Bi_1/2Cu₃Ti₄O₁₂ ceramics

Tuning oxygen vacancy in LiNbO₃ single crystals for prominent memristive and dielectric behaviors