Search results for: Yongke Yan

Items from 1 to 17 out of 17 results

article

Excellent temperature stability of piezoelectric properties in PbNb₂O₆‐based ceramics up to 450°C

Ruoqi Jin, Xiaodan Ren, Liqing Hu, Mingyang Tang, more

Journal of the American Ceramic Society > 107 > 7 > 4914 - 4924

Dense (Pb_0.92Ba_0.08)Nb₂O₆‐xmol% MnO₂ with 0.25 wt% TiO₂ ceramics with a single orthorhombic phase were synthesized through a conventional solid‐state reaction method. Excellent piezoelectric performance (d₃₃= 90 pC/N) and low dielectric loss (tan δ = 0.5%) are achieved in Mn‐doped samples. Interestingly, the dielectric anomalies are observed in the temperature range of 300–400°C, which could be completely...

article

Electromechanical properties of [0 0 1]‐textured Mn–PMN–PZT ceramics under uniaxial pressure

Mingyang Tang, Xin Liu, Xiaodan Ren, Yike Wang, more

Journal of the American Ceramic Society > 107 > 4 > 2272 - 2281

Dielectric, ferroelectric, and piezoelectric properties of both random and textured Mn–PMN–PZT ceramics were characterized under uniaxial stress. Textured ceramics exhibit a large piezoelectric response under uniaxial pressure; the bias field piezoelectric constant is higher than 700 pC/N when pressure is below 50 MPa. Moreover, textured ceramics also show better depolarization resistance under uniaxial...

article

Giant Energy Density via Mechanically Tailored Relaxor Ferroelectric Behavior of PZT Thick Film

Mahesh Peddigari, Bo Wang, Rui Wang, Woon‐Ha Yoon, more

Advanced Materials > 35 > 45 > n/a - n/a

Relaxor ferroelectrics (RFEs) are being actively investigated for energy‐storage applications due to their large electric‐field‐induced polarization with slim hysteresis and fast energy charging–discharging capability. Here, a novel nanograin engineering approach based upon high kinetic energy deposition is reported, for mechanically inducing the RFE behavior in a normal ferroelectric Pb(Zr_0.52Ti_0.48...

article

Giant Energy Density via Mechanically Tailored Relaxor Ferroelectric Behavior of PZT Thick Film (Adv. Mater. 45/2023)

Mahesh Peddigari, Bo Wang, Rui Wang, Woon‐Ha Yoon, more

Advanced Materials > 35 > 45 > n/a - n/a

High Energy Density Capacitors In article number 2302554, Long‐Qing Chen, Shashank Priya, Dae‐Yong Jeong, Jungho Ryu, and co‐workers reveal a giant energy storage density of over 120 J cm⁻³ with an ultrahigh breakdown strength of 540 MV m⁻¹ (equivalent to the breakdown strength of ferroelectric polymers) in a nanograin engineered PZT thick film. The nano‐grain architecture composite microstructure...

article

Achieving large piezoelectric response and ultrahigh electrostriction in [001] textured BiScO₃‐PbTiO₃ high‐temperature piezoelectric ceramics

Xiaodan Ren, Yike Wang, Mingyang Tang, Xin Liu, more

Journal of the American Ceramic Society > 106 > 9 > 5331 - 5340

[001] textured 0.40BiScO₃‐0.60PbTiO₃‐0.125 mol%Nb⁵⁺ (BS‐60PT‐0.125Nb) high‐temperature piezoelectric ceramics were synthesized using templated grain growth process. A high texture degree F₀₀₁ of 99% was obtained using 2 vol% BaTiO₃ (BT) templates. The piezoelectric charge constant d₃₃ and the unipolar strain under 40 kV cm⁻¹ at room temperature for the textured ceramics are 646 pC N⁻¹ and 0.36%, respectively,...

article

Photovoltaic Devices: Fullerene Polymer Complex Inducing Dipole Electric Field for Stable Perovskite Solar Cells (Adv. Funct. Mater. 12/2019)

Congcong Wu, Kai Wang, Yongke Yan, Dong Yang, more

Advanced Functional Materials > 29 > 12 > n/a - n/a

In article number 1804419, Congcong Wu, Shashank Priya, and co‐workers develope a dual‐functional PMMA‐fullerene complex, where the fullerene C60 dwells in the caves of the PMMA polymer chain. The PMMA‐fullerene complex is incorporated into the perovskite layer, which resides along the grain boundary of the perovskites. The fullerene reduces the charge carrier recombination and the PMMA polymer improves...

article

Fullerene Polymer Complex Inducing Dipole Electric Field for Stable Perovskite Solar Cells

Congcong Wu, Kai Wang, Yongke Yan, Dong Yang, more

Advanced Functional Materials > 29 > 12 > n/a - n/a

Lead halide perovskite solar cells (PSCs) have demonstrated great potential for realizing low‐cost and easily fabricated photovoltaics. At this juncture, power conversion efficiency and long‐term stability are two important factors limiting their transition. PSCs exhibit rapid environmental degradation since the perovskite layer is very sensitive to factors such as humidity, temperature, and ultraviolet...

article

Theoretical model and computer simulation of Metglas/PZT magnetoelectric composites for voltage tunable inductor applications

Liwei D. Geng, Yongke Yan, Shashank Priya, Yu U. Wang

Acta Materialia > 2017 > 140 > C > 97-106

Control of magnetic permeability through voltage promises to create novel electronic devices, such as voltage tunable inductors. The relationship between the structure and property of voltage tunable inductors comprising of magnetoelectric Metglas/PZT composites and the underlying domain-level mechanisms are investigated using theoretical analysis, computer simulation, and complementary experiments...

article

Cost-effective sustainable-engineering of CH3NH3PbI3 perovskite solar cells through slicing and restacking of 2D layers

Congcong Wu, Haijin Li, Yongke Yan, Bo Chi, more

Nano Energy > 2017 > 36 > C > 295-302

Owing to their high conversion efficiency and potentially cost-effective manufacturing, organic–inorganic lead halide perovskite solar cells (PSCs) have been dominant photovoltaic research topic in this decade. The photovoltaic performance of PSCs is highly dependent upon the quality of perovskite layer. In order to advance the deployment of PSCs, fabrication of high-quality perovskite film using...

article

Phase transformation and high electrochemical performance of La0.78Mg0.22Ni3.73 alloy with (La,Mg)5Ni19 superlattice structure

Jingjing Liu, Yongke Yan, Honghui Cheng, Shumin Han, more

Journal of Power Sources > 2017 > 351 > C > 26-34

A (La,Mg)₅Ni₁₉ single-phase La_0.78Mg_0.22Ni_3.73 alloy with superior overall electrochemical properties has been prepared by step-wise annealing the as-cast alloy sample. The as-cast alloy is composed of 2H-/3R-type (La,Mg)₂Ni₇ and (La,Mg)₅Ni₁₉ main phases as well as (La,Mg)Ni₃ and LaNi₅ minor phases. During step-wise annealing process, (La,Mg)Ni₃ and LaNi₅ minor phases are first consumed to form (La,Mg)...

article

Synchrotron radiation X-ray powder diffraction techniques applied in hydrogen storage materials - A review

Honghui Cheng, Chen Lu, Jingjing Liu, Yongke Yan, more

Progress in Natural Science: Materials International > 2017 > 27 > 1 > 66-73

Synchrotron radiation is an advanced collimated light source with high intensity. It has particular advantages in structural characterization of materials on the atomic or molecular scale. Synchrotron radiation X-ray powder diffraction (SR-XRPD) has been successfully exploited to various areas of hydrogen storage materials. In the paper, we will give a brief introduction on hydrogen storage materials,...

chapter

Design of Metglas/polyvinylidene fluoride magnetoeletric laminates for energy harvesting from power cords

Myung-Eun Song, Yongke Yan, Sreenivasulu Gollapudi, Mirza Bichurin, more

2016 IEEE SENSORS > 1 - 3

2016 IEEE Sensors

We describe energy harvesting from power cords using flexible magnetoelectric (ME) laminate. ME laminate consisted of Metglas magnetostrictive layer and polyvinylidene fluoride (PVDF) piezoelectric layers in sandwich configuration. Laminates of different lengths were wrapped around the power cords in two ways: on the outer layer of cord and on the inner layer of the cord obtained by peeling-off the...

chapter

Combinatory piezoelectric and inductive vibration energy harvesters

Anthony Marin, Yongke Yan, Shashank Priya

Proceedings of ISAF-ECAPD-PFM 2012 > 1 - 4

2012 Joint 21st IEEE ISAF / 11th IEEE ECAPD / IEEE PFM (ISAF/ECAPD/PFM)

This paper provides an overview of vibration energy harvesting techniques using combinatory piezoelectric and inductive vibration energy harvesters. We provide detailed analysis of both mechanisms by comparing and contrasting the design, operating principle, and performance of each harvester. After introducing the two types of mechanisms, we discuss the methods to increase the power density through...

article

Role of Secondary Phase in High Power Piezoelectric PMN‐PZT Ceramics

Yongke Yan, Kyung‐Hoon Cho, Shashank Priya, A.‐K. Axelsson

Journal of the American Ceramic Society > 94 > 12 > 4138 - 4141

This study reports the dielectric and piezoelectric properties of 0.4Pb(Mg_1/3Nb_2/3)O₃‐0.25PbZrO₃‐0.35PbTiO₃ (PMN‐PZT), 2 mol% MnO₂‐doped 0.4Pb(Mg_1/3Nb_2/3)O₃‐0.25PbZrO₃‐0.35PbTiO₃ (MnO₂+PMN‐PZT), and 0.06Pb(Mn_1/3Nb_2/3)O₃‐0.34Pb(Mg_1/3Nb_2/3)O₃‐0.25PbZrO₃‐0.35PbTiO₃ (PMnN+PMN‐PZT) ceramics. The results show that MnO₂ modification results in the formation of MgO secondary phase which promotes grain growth...

article

Identification and Effect of Secondary Phase in MnO₂‐Doped 0.8Pb(Zr_0.52Ti_0.48)O₃–0.2Pb(Zn_1/3Nb_2/3)O₃ Piezoelectric Ceramics

Yongke Yan, Kyung‐Hoon Cho, Shashank Priya, A. Feteira

Journal of the American Ceramic Society > 94 > 11 > 3953 - 3959

0.8 Pb(Zr_0.52Ti_0.48)O₃–0.2 Pb(Zn_1/3Nb_2/3)O₃ (PZT–PZN) and 2 mol% Mn‐doped PZT–PZN ceramics were investigated to deterministically identify the presence and effect of the secondary phase in controlling electrical properties. On the basis of the X‐ray diffraction and energy dispersive spectroscopy analysis, we show that secondary phase in Mn‐doped PZT–PZN is not MnO₂ precipitate, but it is related to...

article

Templated Grain Growth of 〈001〉‐Textured 0.675Pb(Mg_1/3Nb_2/3)O₃–0.325PbTiO₃ Piezoelectric Ceramics for Magnetic Field Sensors

Yongke Yan, Kyung‐Hoon Cho, Shashank Priya

Journal of the American Ceramic Society > 94 > 6 > 1784 - 1793

〈001〉‐textured 0.675Pb(Mg_1/3Nb_2/3)O₃–0.325PbTiO₃ (PMN–32.5PT) ceramics were synthesized through templated grain growth method using BaTiO₃ (BT) platelets as templates. A systematic investigation was conducted on delineating the texture development and microstructure evolution as a function of heat‐treatment conditions. It was found that BT has very good stability in PbO‐rich PMN–PT environment. A...

article

Preparation and characterization of textured Bi0.5(Na0.8 K0.2)0.5TiO3 ceramics by reactive templated grain growth

Wei Zhao, Heping Zhou, Yongke Yan

Materials Letters > 2008 > 62 > 8-9 > 1219-1222

Bi _0.5 (Na _0.8 K _0.2 ) _0.5 TiO ₃ (abbreviated as BNKT) piezoelectric ceramics with extensive <001> texture were prepared by the reactive templated grain growth (RTGG), using plate-like Bi ₄ Ti ₃ O ₁₂ (BiT) particles as the templates. Through the analysis of X-ray diffraction pattern of the obtained materials, extensive crystallographic...

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