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Atul Thakre,Ajeet Kumar,Dae-Yong Jeong,Geon-Tae Hwang,Woon-Ha Yoon,Ho-Yong Lee,Jungho Ryu 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.2
The solid solution of relaxor and lead titanate single crystals have been an excellent choice for electromechanical applicationssuch as energy harvesters, SONARs, transducers, and biomedical equipment. The mechanical quality factor ( Q m ) plays acrucial role in such applications using high power resonance condition. In this work, 32 mode (011) oriented along thicknessdirection, Generation-III piezoelectric single crystals based on PMN-PZT [71Pb(Mg 1/3 Nb 2/3 )O 3 –29PbZrTiO 3 ] havebeen grown by solid state single crystal growth method. The Mn doping concentration in the crystals were systematicallycontrolled within the range of 0 to 1.0 mol.%. The piezoelectric properties noticeably varied with the Mn doping concentrationwhen the content is over 0.1 mol.%. In order to obtain signifi cant enhancement in Q m in PMN-PZT single crystals,especially, the Mn doping concentration should be higher than 0.7 mol.% (which off ers highest fi gure of merit) for highpower resonance applications.
Kumar Ajeet,Lee Geon,Thakre Atul,Patil Deepak Rajaram,Han Guifang,Ryu Jungho 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.6
This study reports the fabrication of manganese (Mn) doped antiferroelectric (AFE) thick fi lms (thickness of ~ 2 μm) of (Pb0.93 La0.07 )(Zr0.82 Ti0.18 )O3 (PLZT 7/82/18) at room temperature using aerosol deposition (AD) technique without any additional thermal treatment. The Mn-doped PLZT 7/82/18 AD thick fi lms demonstrate excellent energy storage and electrical properties despite being fabricated at room temperature. The dielectric properties of the PLZT AD thick fi lms were investigated across a frequency range of 100 Hz–1 MHz and a temperature range of 25–250 o C. The Mn-doped PLZT AD thick fi lms exhibit a dielectric constant of ~ 108, low dielectric loss of 0.0211, and high-temperature stability of ~ 5.5% (from 1 kHz to 1 MHz). The bipolar P-E and I-E hysteresis loops of the PLZT AD thick fi lms do not show an AFE behavior, however, resemble the paraelectric/dielectric type of loops. The Mn-doped PLZT AD thick fi lms exhibit high dielectric breakdown strength (DBS) of ~ 5420 kV/cm, energy-storage density (ESD) of ~ 38.7 W/cm 3 , with high energy effi ciency of ~ 71%. Additionally, the Mn-doped PLZT AD thick fi lms demonstrate a low leakage current and excellent fatigue properties, as indicated by the obtained polarization, DBS, ESD, and energy effi ciency after 10 8 cycles.
Ajeet Kumar,Jang Yuel Yoon,Atul Thakre,Mahesh Peddigari,정대용,Young-Min Kong,Jungho Ryu 한국세라믹학회 2019 한국세라믹학회지 Vol.56 No.4
In this study, the dielectric and polarization properties of manganese (Mn% = 0.0, 0.1, 0.2, 0.5) doped (Pb0.93La0.07)(Zr0.82Ti0.18)O3 (PLZT 7/82/18) anti-ferroelectric ceramics were studied for energy storage capacitor and pyroelectric applications. A systematic investigation demonstrated that the electric properties of PLZT 7/82/18 ceramics are affected significantly by the Mn-doping content. A maximum dielectric constant of ~ 2,128 at 1 kHz was found for 0.1% Mn-doped PLZT ceramics with a low dielectric loss of 0.018. The bipolar polarization versus electric field (P-E) hysteresis loops were traced for all compositions showing a typical anti-ferroelectric nature. The breakdown field was found to decrease with Mn-doping. The energy storage density and efficiency were found to be 460 J/cm3 and ~ 63%, respectively, for 0.2% Mn-doped PLZT ceramics. The pyroelectric coefficient of PLZT ceramics shows an increase based on the amount of Mn-doping.
Kumar, Ajeet,Yoon, Jang Yuel,Thakre, Atul,Peddigari, Mahesh,Jeong, Dae-Yong,Kong, Young-Min,Ryu, Jungho The Korean Ceramic Society 2019 한국세라믹학회지 Vol.56 No.4
In this study, the dielectric and polarization properties of manganese (Mn% = 0.0, 0.1, 0.2, 0.5) doped (Pb<sub>0.93</sub>La<sub>0.07</sub>)(Zr<sub>0.82</sub>Ti<sub>0.18</sub>)O<sub>3</sub> (PLZT 7/82/18) anti-ferroelectric ceramics were studied for energy storage capacitor and pyroelectric applications. A systematic investigation demonstrated that the electric properties of PLZT 7/82/18 ceramics are affected significantly by the Mn-doping content. A maximum dielectric constant of ~ 2,128 at 1 kHz was found for 0.1% Mn-doped PLZT ceramics with a low dielectric loss of 0.018. The bipolar polarization versus electric field (P-E) hysteresis loops were traced for all compositions showing a typical anti-ferroelectric nature. The breakdown field was found to decrease with Mn-doping. The energy storage density and efficiency were found to be 460 J/㎤ and ~ 63%, respectively, for 0.2% Mn-doped PLZT ceramics. The pyroelectric coefficient of PLZT ceramics shows an increase based on the amount of Mn-doping.