Journal ArticleDOI
Influence of zirconia addition on the microstructure of K0.5Na0.5NbO3 ceramics
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TLDR
In this paper, a bimodal microstructure of K 0.5 Na0.5 NbO3 (KNN) ceramics with the addition of 1 mass% ZrO2 with the aim to hinder the exaggerated grain growth encountered in KNN was investigated.Abstract:
We prepared (K0.5Na0.5)NbO3 (KNN) ceramics with the addition of 1 mass% ZrO2 with the aim to hinder the exaggerated grain growth encountered in KNN. Both KNN and KNN-ZrO2 ceramics sintered at 1115 °C and 1125 °C, respectively, had relative density exceeding 95%. KNN had a bimodal microstructure, with a population of fine grains of a few 100 nm and the large grains of about 20 μm, while the microstructure of KNN-ZrO2 was fine and uniform, with the median grain size of 0.3 μm and the largest grains of about 1.3 μm. We attribute the refinement of the microstructure to the matrix grain-growth inhibition by ZrO2 addition. The influence of ZrO2 is twofold: sub-100 nm sized ZrO2 particles, located at the KNN grain junctions hinder the matrix grain growth. Additionally, the enrichment of the boundary regions of the matrix grains with Zr relative to the grain interiors, confirmed by TEM/EDXS analysis, is also a probable reason for the decreased mobility of the grain boundaries. The dielectric permittivity and losses, measured at 10 kHZ, and piezo d33 constant of KNN-ZrO2 are 905, 0.04 and 100 pC/N, respectively.read more
Citations
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Perspective on the Development of Lead-free Piezoceramics
TL;DR: In this paper, general guidelines for the development of lead-free piezoelectric ceramics are presented, ranging from atom to phase diagram, and the current development stage in lead free piezoceramics is then critically assessed.
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Potassium-sodium niobate lead-free piezoelectric materials: past, present, and future of phase boundaries.
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Review: environmental friendly lead-free piezoelectric materials
TL;DR: In this article, the authors reviewed the recent developments on lead-free piezo materials emphasizing on their preparation, structure-property correlation, etc., and concluded that some lead free compositions show stable piezoelectric responses even though they do not match the overall performance of PZT.
Journal ArticleDOI
Enhanced energy storage properties in sodium bismuth titanate-based ceramics for dielectric capacitor applications
Yichen Wu,Yichen Wu,Yuzhu Fan,Ningtao Liu,Ping Peng,Mingxing Zhou,Shiguang Yan,Fei Cao,Xianlin Dong,Genshui Wang +9 more
TL;DR: In this paper, a compositional design of Bi0.85Bi0.1□ 0.5Na0.5TiO3 (BNT) and NaNbO3(NN) ceramics was proposed for energy storage.
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Lead-free piezoelectrics based on potassium-sodium niobate with giant d(33).
Binyu Zhang,Jiagang Wu,Xiaojing Cheng,Xiaopeng Wang,Dingquan Xiao,Jianguo Zhu,Xiangjian Wang,Xiaojie Lou +7 more
TL;DR: The material system is the most promising lead-free piezoelectric candidates for the practical applications and the underlying physical mechanisms for enhanced piez Zoelectric properties are addressed.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
Journal ArticleDOI
Lead-free piezoceramics
Yasuyoshi Saito,Hisaaki Takao,Toshihiko Tani,Tatsuhiko Nonoyama,Kazumasa Takatori,Takahiko Homma,Toshiatsu Nagaya,Masaya Nakamura +7 more
TL;DR: A lead-free piezoelectric ceramic with an electric-field-induced strain comparable to typical actuator-grade PZT is reported, achieved through the combination of the discovery of a morphotropic phase boundary in an alkaline niobate-based perovskite solid solution, and the development of a processing route leading to highly textured polycrystals.
Journal ArticleDOI
Ferroelectric and Piezoelectric Properties of Fine‐Grained Na0.5K0.5NbO3 Lead‐Free Piezoelectric Ceramics Prepared by Spark Plasma Sintering
TL;DR: In this paper, highly dense Niobate ceramics were prepared using spark plasma sintering (SPS). Although the SPS temperature was as low as 920 C, the density of the Na 0.5 K 0.5 NbO 3 solid solution was raised to 4.47 g/cm 3 (>99% of the theoretical density).
Journal ArticleDOI
Temperature‐Stable Dielectrics Based on Chemically Inhomogeneous BaTiO3
Detlev Hennings,G. Rosenstein +1 more
TL;DR: The dielectric properties and chemical homogeneity of BaTiO3 ceramics sintered with additions of the pseudophase "CdBi2Nb2O9" were investigated using SEM, TEM, STEM, and EDX as mentioned in this paper.
Journal ArticleDOI
Normal Sintering of (K,Na)NbO3‐Based Ceramics: Influence of Sintering Temperature on Densification, Microstructure, and Electrical Properties
Yuhua Zhen,Jing-Feng Li +1 more
TL;DR: In this article, the optimal sintering condition for densification, microstructure, and electrical properties of Li-doped and Li/Ta-codoped potassium sodium niobate (KNbO 3)-based ceramics was investigated.