Yunfei Chang

Publications78
h-index25
Citations1,801
Highly Influential Citations18
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Exceptionally High Piezoelectric Coefficient and Low Strain Hysteresis in Grain-Oriented (Ba, Ca)(Ti, Zr)O3 through Integrating Crystallographic Texture and Domain Engineering.
Both low strain hysteresis and high piezoelectric performance are required for practical applications in precisely controlled piezoelectric devices and systems. Unfortunately, enhanced piezoelectric… Expand
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Templated Grain Growth in Macroporous Materials
We demonstrate a facile method to produce crystallographically textured, macroporous materials using a combination of modified ice templating and templated grain growth (TGG). The process is… Expand
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Microstructure, Density, and Dielectric Properties of Lead‐Free (K0.44Na0.52Li0.04)(Nb0.96−xTaxSb0.04)O3 Piezoelectric Ceramics
Lead-free (K0.44Na0.52Li0.04) (Nb0.96−xTaxSb0.04)O3 piezoelectric ceramics were prepared by the conventional solid-state sintering method. The grain growth of the ceramics was inhibited and the… Expand
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⟨001⟩ textured (K0.5Na0.5)(Nb0.97Sb0.03)O3 piezoelectric ceramics with high electromechanical coupling over a broad temperature range
⟨001⟩-oriented (K0.5Na0.5)(Nb0.97Sb0.03)O3 (KNNS) ceramics with a narrow orientation distribution (full width at half maximum=7.0°) were produced by templated grain growth using NaNbO3 templates.… Expand
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Mechanistic Interpretation of the Aurivillius to Perovskite Topochemical Microcrystal Conversion Process
The kinetics of topochemical and morphological conversion of platelet-shaped Na3.5Bi2.5Nb5O18, PbBi4Ti4O15, and BaBi4Ti4O15 Aurivillius phases to NaNbO3, PbTiO3, and BaTiO3 perovskites were studied.… Expand
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Structure, microstructure and electrical properties of (1 − x − y)Bi0.5Na0.5TiO3–xBi0.5K0.5TiO3–yBi0.5Li0.5TiO3 lead-free piezoelectric ceramics
Abstract The ternary system (1 −  x  −  y )Bi 0.5 Na 0.5 TiO 3 – x Bi 0.5 K 0.5 TiO 3 – y Bi 0.5 Li 0.5 TiO 3 (abbreviated to BNKLT- x / y ) was synthesized by conventional oxide-mixed method. The… Expand
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Effects of AETiO3 additions on phase structure, microstructure and electrical properties of (K0.5Na0.5)NbO3 ceramics
Abstract Lead-free piezoelectric ceramics with the composition of (K 0.5 Na 0.5 )NbO 3 (KNN) and 0.995(K 0.5 Na 0.5 )NbO 3 –0.005AETiO 3 (AE = Mg, Ca, Sr, Ba) were successfully prepared by… Expand
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Enhanced Electromechanical Properties and Temperature Stability of Textured (K0.5Na0.5)NbO3‐Based Piezoelectric Ceramics
In this work, we report the electromechanical properties of 〈00l〉C-textured (K0.5Na0.5)0.98Li0.02NbO3 (KNLN) and (K0.5Na0.5)(Nb0.85Ta0.15)O3 (KNNT) ceramics produced by templated grain growth. Both… Expand
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Fabrication of Highly Textured Fine‐Grained α‐Alumina by Templated Grain Growth of Nanoscale Precursors
[0001] textured alumina ceramics with a fine grain size were fabricated between 1400°C and 1600°C via templated grain growth (TGG) using fine alumina platelets (~0.6 and ~3 μm diameter) aligned by… Expand
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Synthesis and morphology of anisotropic NaNbO3 seed crystals
Abstract Large platelet NaNbO3 (NN) seed crystals have been successfully synthesized from bismuth layer-structured ferroelectric Bi2.5Na3.5Nb5O18 (BNN) precursor by topochemical microcrystal… Expand
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