Ferroelectric and electrical properties of lead-free (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 thin films

Kim, Ju Sung; Ahn, Chang Won; Ullah, Amir; Chae, Song A; Kim, Ill Won

doi:10.3938/jkps.68.1461

Cited by 5 publications

(3 citation statements)

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“…The undoped film ( x = 0) has a mixed O and T phases at room temperature, accompanied by the dielectric property compromised by the grain boundaries hosted by the mixed phase. The increasing x gradually stabilizes the O phase, so less grain boundaries and higher crystalline quality with less structural inhomogeneity are expected in the doped films at room temperature, leading to the observed higher dielectric constants. − Second, we are able to clarify how the doped CaZrO 3 modifies the thermal instability on the structural lattice in the KNNLT films. In Figure d, a schematic phase diagram, representing the x -dependent structural instability of KNNLT(1 – x )-CZ x ( x = 0, 3, 5%) films, is plotted based on the data obtained from Figure a–c (denoted by solid circles) and Figure b.…”

Section: Resultsmentioning

confidence: 85%

CaZrO₃-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO₃-LiTaO₃ Films

Chen

Dai

et al. 2022

ACS Appl. Electron. Mater.

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Chemical doping has been widely applied to modify the lattice structure and functionalities in perovskite oxide layers. Here, the CaZrO 3 -doped (K 0.49 Na 0.49 Li 0.02 )(Ta 0.2 Nb 0.8 )O 3 films [i.e., KNNLT(1 − x)-CZx, with nominal doping levels x of CaZrO 3 selected at 0, 3, and 5%] are chosen to investigate how the structural instability, as well as dielectric and ferroelectric properties, changes with x. Compared to the undoped film, the introduction of CaZrO 3 suppresses the coexistence of tetragonal and orthorhombic phases, leaving the orthorhombic phase more favored at room temperature. With x increasing from 0 to 5%, the roomtemperature dielectric constant is improved by 60% (i.e., from 736 to 1183 at 1 kHz). On the other hand, the temperaturedependent dielectric constant reveals that the transition temperature T MIX-T , where the almost equivalently mixed phase turns into the high-temperature tetragonal-dominant phase on heating, is reduced with an increase in x. This suggests the doped CaZrO 3 can effectively reduce the energy barrier between the coexisting orthorhombic and tetragonal phases. More importantly, the ferroelectric nature is maintained up to 200 °C in all those samples, showing great application potentials in lead-free electronic devices with tunable structural stability.

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Section: Resultsmentioning

confidence: 85%

CaZrO₃-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO₃-LiTaO₃ Films

Chen

Dai

et al. 2022

ACS Appl. Electron. Mater.

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“…In human anatomy the enzymes and protein molecules comprise of amide like structures and the interactions with fluids within the body determine their stability [1,2] . Amides are characterised by large dielectric constant mainly due to its own dipole and partly due to interactions with surrounding molecules [2][3][4]. Interactions between the constituent molecules and response of binary mixtures to static low frequency electric field can be estimated from the magnitude of dielectric constant of mixture [3,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Dielectric behaviour and dipole moment of binary mixtures containing certain amides in benzene

Bagade

2023

J. Phys.: Conf. Ser.

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Certain polar amides(v) are dissolved in benzene, a nonpolar solvent(u) to prepare binary mixtures with different composition of the amides like acetanilide, N-N-dimethyl acetamide, N-methyl acetamide, acetamide and formamide. Static relative permittivity ɛ0uv , high frequency permittivity ɛ ∞uv for different weight fraction of polar solute at 30°C are determined. The dielectric behaviour of binary mixtures are investigated under electric field of low frequency by using the Debye model for polar liquids. Static dipole moment µs , dipole moment µv from conductivity measurements and µ t from bond angle and bond moment measurements are computed. The dipole moments are consequence of attractive interaction between the adjacent molecules in binary mixture due to variation of electron densities. Hydrogen bonding, associated charge distribution among the constituent molecules, changes in bond angle values are some of the factors that give rise to dipole moment of binary mixtures. Nearly equal and close values of µs , µv and µt proves the correctness of dielectric behaviour studies of amides- benzene binary mixtures.

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“…Ahn et al reached currents below 10 -6 A/cm 2 for fields under 80 kV/cm for 20 mol% alkali excess [3]. More insulating properties are achieved with Mn, Li or Ta doping [11,25,47,51,52,53]. 0.5 mol% Mn doped KNN films were reported to exhibit leakage current densities of around 3.6 x 10 -7 A/cm 2 with breakdown fields of around 200 kV/cm [47] and 1 x 10 -7 A/cm 2 at 100 kV/cm [19].…”

Section: Introductionmentioning

confidence: 99%

Comparative Solution Synthesis of Mn Doped (Na,K)NbO₃ Thin Films

Kovacova

Yang

Jacques

et al. 2020

Chemistry A European J

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Ferroelectric and electrical properties of lead-free (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 thin films

Cited by 5 publications

References 24 publications

CaZrO₃-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO₃-LiTaO₃ Films

CaZrO₃-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO₃-LiTaO₃ Films

Dielectric behaviour and dipole moment of binary mixtures containing certain amides in benzene

Comparative Solution Synthesis of Mn Doped (Na,K)NbO₃ Thin Films

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Ferroelectric and electrical properties of lead-free (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 thin films

Cited by 5 publications

References 24 publications

CaZrO3-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO3-LiTaO3 Films

CaZrO3-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO3-LiTaO3 Films

Dielectric behaviour and dipole moment of binary mixtures containing certain amides in benzene

Comparative Solution Synthesis of Mn Doped (Na,K)NbO3 Thin Films

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Product

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CaZrO₃-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO₃-LiTaO₃ Films

CaZrO₃-Mediated Structural Instability and Electrical Properties in Doped Ferroelectric (K,Na)NbO₃-LiTaO₃ Films

Comparative Solution Synthesis of Mn Doped (Na,K)NbO₃ Thin Films