Giant Dielectric Permittivity Observed in Li and Ti Doped NiO

Wu, Jingshi; Chen, Nan; Lin, Yuanhua; Deng, Yuan

doi:10.1103/physrevlett.89.217601

Cited by 669 publications

(448 citation statements)

References 17 publications

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“…Ever since, these material suffers multiple valance (Fe 3þ /Fe 2þ , Ti 4þ /Ti 3þ , Mn 3þ /Mn 4þ ) which can be correlated with oxygen vacancies is a common feature for the CDC effect in transition metal ions. [5][6][7][8][9][10][11] Worthwhile, LaFeO 3 ceramic also exhibit CDC up to 380 K. For the first time, Idress et al 12 reported a giant dielectric constant behavior in LaFeO 3 , which was an extrinsic effect due to Maxwell-Wagner relaxation. 11,12 Despite, it has few limitations, such as high leakage current, intrinsic antiferromagnetic and weak ME coupling at RT, which can hamper the large scale applications.…”

Section: Introductionmentioning

confidence: 99%

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO₃−xBaTiO₃ (0.0 ≤ x ≤ 0.25) solid solutions

et al. 2016

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The solid solutions of (1 À x) LaFeO 3 -xBaTiO 3 (0.0 x 0.25) have been synthesized successfully by the conventional solid-state reaction method. Room temperature (RT) X-ray diffraction studies reveal the stabilization of orthorhombic phase with Pbnm space group. Complete solubility in the perovskite series was demonstrated up to x ¼ 0:25. The dielectric permittivity shows colossal dielectric constant (CDC) at RT. The doping of BaTiO 3 in LaFeO 3 exhibit pronounced CDC up to a composition x ¼ 0:15, further it starts to decrease. The frequency-dependent dielectric loss exhibits polaronic conduction, which can attribute to presence of multiple valence of iron. The relaxation frequency and polaronic conduction mechanism was shifted towards RT as function of x. Moreover, large magnetic moment with weak ferromagnetic behavior is observed in doped LaFeO 3 solid solution, which might be the destruction of spin cycloid structure due to insertion of Ti in Fe-O-Fe network of LaFeO 3 .

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Section: Introductionmentioning

confidence: 99%

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO₃−xBaTiO₃ (0.0 ≤ x ≤ 0.25) solid solutions

et al. 2016

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“…The experimental results suggest that the photo-induced effect in SrTiO 3 is consistent with the conductive-region model. Giant dielectric response in nonferroelectric materials has been reported for grains surrounded by the insulating grain boundary and is explained by the Maxwell-Wagner model, namely the conductive-region model (Homes et al, 2001;Wu et al, 2002;Dwivedi et al, 2010). SrTiO 3 crystal is a stoichiometric material and has no grain structure.…”

Section: Transient Birefringence In the Millisecond Regionmentioning

confidence: 99%

Photo-induced Effect in Quantum Paraelectric Materials Studied by Transient Birefringence Measurement

Kohmoto¹,

Koyama²

2011

Ferroelectrics - Physical Effects

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“…We will list here some of them: Li and Ti substituted NiO (Ref. 23 Fig. 8, the qualitative features of these materials are all the same: -a huge (" > 10 4 Þ and temperature stable dielectric permittivity in the high temperature range (T > 300 K), -a sharp decrease of this dielectric permittivity on cooling to temperatures lower than 300 K, the falling temperature decreasing on decreasing the operating frequency, -a related maximum of the imaginary part " 00 of the dielectric permittivity shifting versus frequency just like the " 0 step.…”

Section: Macroscopic Space Charges In Other Oxidesmentioning

confidence: 99%

Free charge localization and effective dielectric permittivity in oxides

Maglione

2016

J. Adv. Dielect.

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This review will deal with several types of free charge localization in oxides and their consequences on the effective dielectric spectra of such materials. The first one is the polaronic localization at the unit cell scale on residual impurities in ferroelectric networks. The second one is the collective localization of free charge at macroscopic interfaces like surfaces, electrodes and grain boundaries in ceramics. Polarons have been observed in many oxide perovskites mostly when cations having several stable electronic configurations are present. In manganites, the density of such polarons is so high as to drive a net lattice of interacting polarons. On the other hand, in ferroelectric materials like BaTiO 3 and LiNbO 3 , the density of polarons is usually very small but they can influence strongly the macroscopic conductivity. The contribution of such polarons to the dielectric spectra of ferroelectric materials is described. Even residual impurities as for example Iron can induce well-defined anomalies at very low temperatures. This is mostly resulting from the interaction between localized polarons and the highly polarizable ferroelectric network in which they are embedded. The case of such residual polarons in SrTiO 3 will be described in more detail, emphasizing the quantum polaron state at liquid helium temperatures. Recently, several nonferroelectric oxides have been shown to display giant effective dielectric permittivity. It is first shown that the frequency/temperature behavior of such parameters is very similar in very different compounds (donor-doped BaTiO 3 , CaCu 3 Ti 4 O 12 , LuFe 2 O 4 , Li-doped NiO, etc.). This similarity calls for a common origin of the giant dielectric permittivity in these compounds. A space charge localization at macroscopic interfaces can be the key for such extremely high dielectric permittivity.

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Giant Dielectric Permittivity Observed in Li and Ti Doped NiO

Cited by 669 publications

References 17 publications

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO₃−xBaTiO₃ (0.0 ≤ x ≤ 0.25) solid solutions

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO₃−xBaTiO₃ (0.0 ≤ x ≤ 0.25) solid solutions

Photo-induced Effect in Quantum Paraelectric Materials Studied by Transient Birefringence Measurement

Free charge localization and effective dielectric permittivity in oxides

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Giant Dielectric Permittivity Observed in Li and Ti Doped NiO

Cited by 669 publications

References 17 publications

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO3−xBaTiO3 (0.0 ≤ x ≤ 0.25) solid solutions

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO3−xBaTiO3 (0.0 ≤ x ≤ 0.25) solid solutions

Photo-induced Effect in Quantum Paraelectric Materials Studied by Transient Birefringence Measurement

Free charge localization and effective dielectric permittivity in oxides

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Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO₃−xBaTiO₃ (0.0 ≤ x ≤ 0.25) solid solutions

Origin of giant dielectric permittivity and weak ferromagnetic behavior in (1−x)LaFeO₃−xBaTiO₃ (0.0 ≤ x ≤ 0.25) solid solutions