Large nonlinear dielectric behavior in BaTi1−xSnxO3

Ren, Pengrong; Liu, Zicheng; Wang, Qian; Peng, Biaolin; Ke, Shanming; Fan, Huiqing; Zhao, Gaoyang

doi:10.1038/s41598-017-07192-x

Cited by 27 publications

(8 citation statements)

References 29 publications

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“…At temperatures just above T c , the dielectric permittivity and loss are reduced. At these temperatures, where the sample is nominally paraelectric, and long-range FE ordering is lost, polar nanoclusters are believed to exist, and these become the major contributors to the dielectric permittivity. , In this nominally paraelectric state, the material offers the best tunability performance with low loss that is desirable for practical applications. A further increase in temperature causes a reduction in the concentration of the polar nanoclusters, as the material enters a truly paraelectric state, with a resultant decrease in dielectric permittivity.…”

Section: Resultsmentioning

confidence: 99%

High Tunability and Low Loss in Layered Perovskite Dielectrics through Intrinsic Elimination of Oxygen Vacancies

et al. 2020

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Dielectric materials with moderate dielectric permittivity, high tunability, and low loss are critical in modern communication technology. However, high tunability is often associated with high loss and high dielectric permittivity. Here, a novel material, textured Sr2(Ta1–x Nb x )2O7 (STN), with a layered perovskite structure, has been designed to break this correlation. These materials exhibit low dielectric loss associated with oxygen vacancy elimination through the creation of stacking faults in the layered structure, as evidenced by transmission electron microscopy (TEM). A modification of the Vendik model was used to fit the thermal dependence of their relative dielectric permittivity, which included an oxygen defect parameter as an indicator of the oxygen defect concentration. The high tunability is attributed to the presence of local polar nanoclusters just above the Curie point. A two-step spark plasma sintering method was employed to prepare grain-oriented ceramics with optimized properties. A near-optimum maximum tunability of 72% at room temperature was obtained for a textured Sr2Ta1.88Nb0.12O7 ceramic, with moderate dielectric permittivity (ε′ ∼ 520) and a dielectric loss of less than 1%.

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Section: Resultsmentioning

confidence: 99%

High Tunability and Low Loss in Layered Perovskite Dielectrics through Intrinsic Elimination of Oxygen Vacancies

et al. 2020

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“…A significant decay in the tunability and dielectric constant could be seen with an increase in [Ba], suggesting a practical pathway to finely calibrate the dielectric properties through an elemental control. Furthermore, a comparison of the dielectric tunability between different dielectric systems is shown in Table S2 [41][42][43][44] , Supporting Information, according to which, larger values of dielectric tunability can be seen in the synthesized PMNTHZO and PMNTB-HZO films. Moreover, the thermal stability and temperature endurance were also enhanced by the introduction of a high-entropy design.…”

Section: Temperature-dependency Of Dielectric Properties Of Pmntbhzo ...mentioning

confidence: 99%

High Entropy Nonlinear Dielectrics with Superior Thermally Stable Performance

et al. 2023

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A high configurational entropy, achieved through a proper design of compositions can minimize the Gibbs free energy and stabilize the quasi‐equilibrium phases in a solid‐solution form. This leads to the development of high‐entropy materials with unique structural characteristics and excellent performance, which otherwise could not be achieved through conventional pathways. This work developed a high‐entropy nonlinear dielectric system, based on the expansion of lead magnesium niobate–lead titanate. A dense and uniform distribution of nano‐polar regions was observed in the samples owing to the addition of Ba, Hf, and Zr ions, which led to enhanced performance of nonlinear dielectrics. The fact that no structural phase transformation was detected up to 250 °C, and no noticeable change or steep drop in structural and electrical characteristics was observed at high temperatures suggests a robust thermal stability of the dielectric systems developed. With these advantages, these materials hold vast potential for applications, such as dielectric energy storage, dielectric tunability, and electro‐caloric effect. Thus, this work offers a new high‐entropy configuration with elemental modulation, with enhanced dielectric material features.This article is protected by copyright. All rights reserved

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“…These polar entities can give rise to the presence of two current peaks nearby 0 V in the I – E loop (Figure g) and to a narrow, nonlinear P – E hysteresis loop (Figure h). By further increasing the temperature above T c , the dielectric permittivity continuously decreases (Figure d) because of the decreased concentration of polar nanoclusters . The most widely used commercial ferroelectrics are Pb-based materials.…”

Section: Fundamentals Of Dielectricsmentioning

confidence: 99%

“…By further increasing the temperature above T c , the dielectric permittivity continuously decreases (Figure 2d) because of the decreased concentration of polar nanoclusters. 29 The most widely used commercial ferroelectrics are Pb-based materials. However, the use of Pb is increasingly being restricted by environmental regulations; 30 hence, there is an urgent demand for developing lead-free alternative materials for different applications.…”

Section: Fundamentals Of Dielectricsmentioning

confidence: 99%

Terahertz Characterization of Lead-Free Dielectrics for Different Applications

Zhang

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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In this spotlight on applications, we describe our recent progress on the terahertz (THz) characterization of linear and nonlinear dielectrics for broadening their applications in different electrical devices. We begin with a discussion on the behavior of dielectrics over a broadband of frequencies and describe the main characteristics of ferroelectrics, as they are an important category of nonlinear dielectrics. We then move on to look at the influence of point defects, porosities, and interfaces, including grain boundaries and domain walls, on the dielectric properties at THz frequencies. Based on our studies on linear dielectrics, we show that THz characterization is able to probe the effect of porosities, point defects, shear planes, and grain boundaries to improve dielectric properties for telecommunication applications. Further, we demonstrate that THz measurements on relaxor ferroelectrics can be successfully used to study the reversibility of the electric field-induced phase transitions, providing guidance for improving their energy storage efficiency in capacitors. Finally, we show that THz characterization can be used to characterize the effect of domain walls in ferroelectrics. In particular, our studies indicate that the dipoles located within domain walls provide a lower contribution to the permittivity at THz frequencies than the dipoles present in domains. The new findings could help develop a new memory device based on nondestructive reading operations using a THz beam.

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Large nonlinear dielectric behavior in BaTi1−xSnxO3

Cited by 27 publications

References 29 publications

High Tunability and Low Loss in Layered Perovskite Dielectrics through Intrinsic Elimination of Oxygen Vacancies

High Tunability and Low Loss in Layered Perovskite Dielectrics through Intrinsic Elimination of Oxygen Vacancies

High Entropy Nonlinear Dielectrics with Superior Thermally Stable Performance

Terahertz Characterization of Lead-Free Dielectrics for Different Applications

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