Improving high-field strain and temperature stability on KNN-based ceramics sintered in reducing atmosphere via defect engineering

Zhenyong Cen; Meiyi Feng; Fuzhi Cao; Yuqi Jiang; Ze Xu; Changrong Zhou; Ke Wang; Nengneng Luo

Journal of Materiomics (Nov 2024)

Improving high-field strain and temperature stability on KNN-based ceramics sintered in reducing atmosphere via defect engineering

Zhenyong Cen,
Meiyi Feng,
Fuzhi Cao,
Yuqi Jiang,
Ze Xu,
Changrong Zhou,
Ke Wang,
Nengneng Luo

Affiliations

Zhenyong Cen: State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China; Corresponding author.
Meiyi Feng: State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
Fuzhi Cao: State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
Yuqi Jiang: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Ze Xu: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Changrong Zhou: Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China
Ke Wang: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Nengneng Luo: State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China

Journal volume & issue: Vol. 10, no. 6
pp. 1165 – 1175

Abstract

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High-field strain and its temperature stability of (1–x) K0.48Na0.52Nb0.96Ta0.04O3-xBaZrO3+8%MnO+3%ZrO2 (in mole, KNNT-xBZ+8Mn) ceramics sintered in reducing atmosphere are improved simultaneously via defect design in A and B site. There is a conducting type transition from n-type to p-type at x = 0.07. The BaZrO3 dopant not only induces the increase of defects (ZrNb′, BaNa·, BaK·) concentration, but also results in the increase of defect (MnNb‴) concentration, because more Mn ions as +2 oxidation state in ceramics is triggered by BaZrO3 doping modification. Defect dipoles (MnNb′′′−Vo··, ZrNb′-Vo··, BaNa·-VNa′, BaK·-VK′) in poled and aged ceramics enhance the reversibility of the non–180° domains switching, which increases the high-field strain of KNNT-xBZ+8Mn ceramics. The reversibility of non–180° domain switching can be preserved to high temperature due to stable defect dipoles (BaNa·-VNa′, BaK·-VK′) in A-site. The KNNT-xBZ+8Mn ceramics at x = 0.07 show the largest high-field strain coefficient (543 pm/V@20 kV/cm) and the highest temperature stability (125 °C). The KNNT-xBZ+8Mn ceramic is a lead-free material with great potential to be applied in the fabrication of multilayer ceramic actuators with Ni inner electrodes in the future.

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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