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Related Concept Videos

Solid–Solid Solutions01:24

Solid–Solid Solutions

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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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High-Temperature Dielectrics in BNT-BT-Based Solid Solution.

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    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |June 3, 2016
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    Summary
    This summary is machine-generated.

    This study developed lead-free, bismuth-substituted bismuth sodium titanate-barium titanate (BNT-BT) ceramics for high-temperature capacitors. These materials exhibit excellent energy storage and a broad operational temperature range, making them ideal for demanding applications.

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    Area of Science:

    • Materials Science
    • Solid-State Chemistry
    • Ceramic Engineering

    Background:

    • High-temperature capacitors require materials with stable dielectric properties and high energy storage density.
    • Lead-free alternatives to traditional lead-based ferroelectrics are crucial for environmental sustainability.
    • Bismuth sodium titanate-barium titanate (BNT-BT) based systems show promise but require optimization for high-temperature performance.

    Purpose of the Study:

    • To investigate the potential of ternary BNT-BT-NaNbO3 solid solutions for high-temperature capacitor applications.
    • To optimize the composition by incorporating bismuth to enhance dielectric properties and energy storage.
    • To characterize the dielectric behavior, dc resistivity, and energy-storage performance of the developed ceramics.

    Main Methods:

    • Synthesis and characterization of (1 - x )(0.92Bi0.5Na0.5TiO3-0.08BaTiO3)- x NaNbO3 ceramics.
    • Investigated the effect of bismuth substitution (Na1-3yBiyNbO3) on the properties of a selected BNT-BT-NN matrix.
    • Measured dielectric properties, dc resistivity, and energy-storage density/efficiency at various temperatures and electric fields.

    Main Results:

    • Identified 0.85(BNT-BT)-0.15NN as a promising parent matrix with high permittivity (>1800) and energy storage (0.56 J/cm³).
    • Bismuth substitution significantly broadened the operational temperature range to over 327 °C (±15% tolerance).
    • Achieved improved energy storage density (0.62 J/cm³) and efficiency (88%) with 7% Bi substitution at 7 kV/mm.

    Conclusions:

    • Bismuth substitution effectively enhances the high-temperature dielectric and energy-storage performance of BNT-BT-based ceramics.
    • The conduction mechanism at elevated temperatures (200-350 °C) is likely related to oxygen vacancy migration.
    • These lead-free BNT-BT-based solid solutions are highly promising for lead-free high-temperature capacitor applications.