High temperature stable dielectric properties of (K0.5Na0.5)0.985Bi0.015Nb0.99Cu0.01O3 ceramics with core-shell microstructures

Zhiyong Liu; Huiqing Fan; Mengmeng Li

doi:10.1039/c5tc00568j

High temperature stable dielectric properties of (K_0.5Na_0.5)_0.985Bi_0.015Nb_0.99Cu_0.01O₃ ceramics with core-shell microstructures

Zhiyong Liu, Huiqing Fan, Mengmeng Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

New high temperature ceramic capacitors (K_0.5Na_0.5)_(1-x)Bi_xNb_(1-2x/3)Cu_2x/3O₃ (x = 0-0.03) with Bi substitution for the A site and Cu substitution for the B site were synthesized using a solid state reaction process. Owing to its inhomogeneous microstructure and diffuse phase transition, (K_0.5Na_0.5)_0.985Bi_0.015Nb_0.99Cu_0.01O₃ shows a stable permittivity (∼1350) over a broad temperature range (40-520 °C) and the capacitance variation is maintained smaller than ±15%, thereby paving the way for achieving high temperature capacitors in KNN based materials. Furthermore, the grain and grain boundary contributions to the capacitance have been separated using impedance spectroscopy, and the grain boundary effects show temperature independent capacitance, whereas grain effects show a capacitance maximum at the tetragonal to cubic phase transition.

Original language	English
Pages (from-to)	5851-5858
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	3
Issue number	22
DOIs	https://doi.org/10.1039/c5tc00568j
State	Published - 14 Jun 2015

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title = "High temperature stable dielectric properties of (K0.5Na0.5)0.985Bi0.015Nb0.99Cu0.01O3 ceramics with core-shell microstructures",

abstract = "New high temperature ceramic capacitors (K0.5Na0.5)(1-x)BixNb(1-2x/3)Cu2x/3O3 (x = 0-0.03) with Bi substitution for the A site and Cu substitution for the B site were synthesized using a solid state reaction process. Owing to its inhomogeneous microstructure and diffuse phase transition, (K0.5Na0.5)0.985Bi0.015Nb0.99Cu0.01O3 shows a stable permittivity (∼1350) over a broad temperature range (40-520 °C) and the capacitance variation is maintained smaller than ±15%, thereby paving the way for achieving high temperature capacitors in KNN based materials. Furthermore, the grain and grain boundary contributions to the capacitance have been separated using impedance spectroscopy, and the grain boundary effects show temperature independent capacitance, whereas grain effects show a capacitance maximum at the tetragonal to cubic phase transition.",

author = "Zhiyong Liu and Huiqing Fan and Mengmeng Li",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

year = "2015",

month = jun,

day = "14",

doi = "10.1039/c5tc00568j",

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T1 - High temperature stable dielectric properties of (K0.5Na0.5)0.985Bi0.015Nb0.99Cu0.01O3 ceramics with core-shell microstructures

AU - Liu, Zhiyong

AU - Fan, Huiqing

AU - Li, Mengmeng

N1 - Publisher Copyright: © The Royal Society of Chemistry.

PY - 2015/6/14

Y1 - 2015/6/14

N2 - New high temperature ceramic capacitors (K0.5Na0.5)(1-x)BixNb(1-2x/3)Cu2x/3O3 (x = 0-0.03) with Bi substitution for the A site and Cu substitution for the B site were synthesized using a solid state reaction process. Owing to its inhomogeneous microstructure and diffuse phase transition, (K0.5Na0.5)0.985Bi0.015Nb0.99Cu0.01O3 shows a stable permittivity (∼1350) over a broad temperature range (40-520 °C) and the capacitance variation is maintained smaller than ±15%, thereby paving the way for achieving high temperature capacitors in KNN based materials. Furthermore, the grain and grain boundary contributions to the capacitance have been separated using impedance spectroscopy, and the grain boundary effects show temperature independent capacitance, whereas grain effects show a capacitance maximum at the tetragonal to cubic phase transition.

AB - New high temperature ceramic capacitors (K0.5Na0.5)(1-x)BixNb(1-2x/3)Cu2x/3O3 (x = 0-0.03) with Bi substitution for the A site and Cu substitution for the B site were synthesized using a solid state reaction process. Owing to its inhomogeneous microstructure and diffuse phase transition, (K0.5Na0.5)0.985Bi0.015Nb0.99Cu0.01O3 shows a stable permittivity (∼1350) over a broad temperature range (40-520 °C) and the capacitance variation is maintained smaller than ±15%, thereby paving the way for achieving high temperature capacitors in KNN based materials. Furthermore, the grain and grain boundary contributions to the capacitance have been separated using impedance spectroscopy, and the grain boundary effects show temperature independent capacitance, whereas grain effects show a capacitance maximum at the tetragonal to cubic phase transition.

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U2 - 10.1039/c5tc00568j

DO - 10.1039/c5tc00568j

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SN - 2050-7534

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SP - 5851

EP - 5858

JO - Journal of Materials Chemistry C

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ER -

High temperature stable dielectric properties of (K_0.5Na_0.5)_0.985Bi_0.015Nb_0.99Cu_0.01O₃ ceramics with core-shell microstructures

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