Electric dipoles via 
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 ion off-center displacement in perovskite 
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Yin, Lihua; Shi, Ting-Yun; Zhang, R. R.; Park, C. B.; Kim, Kee Hoon; Yang, Jiyong; Tong, P.; Song, Wenhai; Dai, Jianming; Zhu, Xuebin; Yan, Wensheng; Sun, Yan

doi:10.1103/physrevb.98.054301

Cited by 14 publications

(7 citation statements)

References 38 publications

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“…Perovskite-structured transition-metal oxides could be attractive candidates in CP with regard to the potential to display a wide variety of electronic and magnetic properties defined by their sensitivity to structures, local perturbations, defect states, chemical modifications, charge transport, and etc., which directly determine the CP property in such sorts of materials. ,− A -site Na 1/2 Bi 1/2 substitution in CCTO could thus alter the lattice polar soft modes ( f 0 ≈ 34 cm –1 ) to achieve an incipient ferroelectricity ( T 0 ≈ −155 K) but retain cubic symmetry (space group: Im 3), while B -site-doped Mn makes CCTO completely lose the CP, only giving a permittivity of 80 . Moreover, the basic polarizations and involved charges in these CP materials always interact with the electrons, phonons, local chemical bonding, and etc., as these usually refer to the d/f electron transport.…”

Section: Introductionmentioning

confidence: 99%

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb₃O₉ with Correlated Magnetoelectric Effect and Variable-Range Hopping

Gao

Xie

Jiang

et al. 2018

ACS Appl. Electron. Mater.

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There is a general perception that the colossal permittivity in nonferroelectric oxides is usually ascribed to the barrier layer capacitor (BLC) effect, but the states of the involved charges as well as corresponding physical picture for the charge transport in the materials are not yet clear, which hinders the explorations and applications for new colossal-permittivity materials and devices. Here, we present the polaronic conduction mechanism in terms of Mott variable-range hopping coupled with the magnetoelectric effect for apparent colossal permittivity in double-perovskite LiCuNb3O9. Valence-state and defect analysis reveals that A-site Cu ions have mixed valences with a determined ratio of Cu+/Cu2+ equal to 1:9 and an intrinsic A-site deficiency that is balanced through oxygen vacancies. Structural refinement combined bond valence sum (BVS) calculation indicates that Cu+ (BVS = 1.3476) is overbonded, while both Cu2+ (BVS = 1.9140) and Nb5+ (BVS = 4.7998) are underbonded, permitting the formation of quasi-CuO4 tetrahedra, distorted NbO6 octahedra, and possible polarons. The LiCuNb3O9 ceramic shows room-temperature colossal permittivity (ε′ > 104) but quickly decreases down to around 100 at a temperature range of 80–150 K, a freezing/activation process, which originates from the electrons in Cu+/Cu2+ that exhibit a paramagnetic characteristic but could distort the lattice to form polarons when hopping. This polaron transport deviates from the Arrhenius law, but in the Mott variable-range-hopping mechanism, that can be manipulated by an external magnetic field through magnetoelectric coupling, which could increase the hopping activation energy and hopping distance. Our results therefore provide significant experimental evidence and understanding for the magneto–dielectric correlation in terms of the polaronic hopping phenomenon, which may guide the exploration of a wider range of magnetoelectric oxide materials.

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Section: Introductionmentioning

confidence: 99%

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb₃O₉ with Correlated Magnetoelectric Effect and Variable-Range Hopping

Gao

Xie

Jiang

et al. 2018

ACS Appl. Electron. Mater.

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“…16 It is believed that the higher coercive field values in the doped PFO samples are due to the displacement of Cr 3+ ions from the centrosymmetric location in the octahedron, thus impeding the polarization reversal. 36 Figure 6d illustrates the relationship between the hysteresis loops of PFOCr5 and the synthesis temperature. The hysteresis loops maintain a very similar shape with a gradual polarization change at the saturation polarization, where the values of P r reach 97 μC cm −2 , 108 μC cm −2 , 112 μC cm −2 at the corresponding synthesis temperatures of 500 °C, 550 °C, and 600 °C.…”

Section: Ferroelectric Properties-figuresmentioning

confidence: 99%

Synthesis and Characterization of Cr-Doped Pb₂Fe₂O₅ Thin Films by Reactive Magnetron Sputtering

Beklešovas,

Stankus,

Abakevičienė

et al. 2023

ECS J. Solid State Sci. Technol.

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Multiferroic materials, which exhibit simultaneous ferroelectricity, ferromagnetism, and ferro-elasticity, have attracted significant attention due to their multifunctional properties. Coupling between ferroelectric and magnetic properties has led to the development of non-volatile memory devices, transducers, magnetic field sensors, and other applications. Pb2Fe2O5 (PFO) is a promising multiferroic material due to it simultaneously exhibiting ferroelectricity and ferromagnetism at room temperature. Doping with aliovalent ions, such as Cr3+, has been proposed as an effective method for enhancing the ferroelectric and magnetic properties, consequently leading to the enhancement of multiferroic properties. The investigation shows that the lead ferrite phase (220) was present in all samples, but its abundance reduced with increasing synthesis temperature due to lead desorption. Dielectric measurements revealed that PFO films with highest Cr concentration had the highest polarization (Pr) of 72.2 μC cm−2. The study also found that the magnetization of PFO films was up to 9.5·10−7 μAm2 at an ambient temperature of 5 K, and the magnetic ordering temperature was 363 K, corresponding to the magnetic ordering temperature of chromium oxides. The morphology of Cr doped PFO films changed with increasing chromium content, resulting in a reduction in grain size and an increase in the film density.

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“…The SmCrO 3 compound demonstrates an electric polarization with the maximum value of ∼ 8 µC/m 2 at E = 1.43 kV/cm and ∼ 15 K (El Amrani et al, 2014), which was ascribed to a breaking of the local symmetry via Cr 3+ off-centering (El Amrani et al, 2014). It was observed that electric dipoles exist in DyCrO 3 compound, which was attributed to the displacement of Cr 3+ cations (Yin et al, 2018). Electric polarizations were observed in TbCrO 3 and TmCrO 3 compounds at E = 1.43 kV/cm below T Cr N (Rajeswaran et al, 2012), while the existence of electric dipoles in TmCrO 3 compound remains a debate (Yoshii & Ikeda, 2019).…”

Section: Introductionmentioning

confidence: 95%

Crystal growth engineering and origin of the weak ferromagnetism in antiferromagnetic matrix of orthochromates from t-e orbital hybridization

Zhu

Xia

et al. 2022

iScience

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Electric dipoles via Cr3+(d3) ion off-center displacement in perovskite

Cited by 14 publications

References 38 publications

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb₃O₉ with Correlated Magnetoelectric Effect and Variable-Range Hopping

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb₃O₉ with Correlated Magnetoelectric Effect and Variable-Range Hopping

Synthesis and Characterization of Cr-Doped Pb₂Fe₂O₅ Thin Films by Reactive Magnetron Sputtering

Crystal growth engineering and origin of the weak ferromagnetism in antiferromagnetic matrix of orthochromates from t-e orbital hybridization

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Electric dipoles via Cr3+(d3) ion off-center displacement in perovskite

Cited by 14 publications

References 38 publications

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb3O9 with Correlated Magnetoelectric Effect and Variable-Range Hopping

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb3O9 with Correlated Magnetoelectric Effect and Variable-Range Hopping

Synthesis and Characterization of Cr-Doped Pb2Fe2O5 Thin Films by Reactive Magnetron Sputtering

Crystal growth engineering and origin of the weak ferromagnetism in antiferromagnetic matrix of orthochromates from t-e orbital hybridization

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Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb₃O₉ with Correlated Magnetoelectric Effect and Variable-Range Hopping

Colossal-Permittivity Behaviors in A-Site Distorted Double-Perovskite LiCuNb₃O₉ with Correlated Magnetoelectric Effect and Variable-Range Hopping

Synthesis and Characterization of Cr-Doped Pb₂Fe₂O₅ Thin Films by Reactive Magnetron Sputtering