Advances in Dielectric Materials and Electronic Devices: Capacitors, Relaxors, Electrostriction, and Energy Applications
Sponsored by: ACerS Electronics Division
Program Organizers: Amar Bhalla, University of Texas; Ruyan Guo, University of Texas at San Antonio; Rick Ubic, Boise State University; Matjaž Spreitzer, Jožef Stefan Institute
Tuesday 8:00 AM
October 11, 2022
Room: 410
Location: David L. Lawrence Convention Center
Session Chair: Matjaz Spreitzer, Jožef Stefan Institute
8:00 AM
Lead-free and Antiferroelectric Ceramics for Novel Energy and Heat-management Technologies: Brigita Rozic1; Zouhair Hanani1; Soukaina Merselmiz2; Daoud Mezzane2; Mimoun El Marssi3; Hana Ursic1; Rasa Pirc1; Matjaz Spreitzer1; Zdravko Kutnjak1; 1Jozef Stefan Institute; 2University Cadi Ayyad; 3University of Picardie Jules Verne
The request for greener heat-management technologies has recently developed a significant interest in new electrocaloric (EC) effect-based cooling devices that can replace the existing cooling technics [1]. An overview of experimental and theoretical investigations of the large EC and piezoelectric response in lead-free ceramic composites and ceramics near antiferroelectric transition will be presented in this contribution. Specifically, the large EC response observed by direct experiments in lead-free BCTZ-based ceramics will be reviewed, including polymer composites' large energy harvesting potential [2]. Besides, it is demonstrated that both negative and positive EC responses can be arbitrarily invoked in antiferroelectric materials by adequately controlling the electric field and temperature, which enables enhancement of the electrocaloric cooling power for up to 100%. [1] Z. Kutnjak., B. Rožič, R. Pirc., Wiley Encyclopedia of Electrical and Electronics Engineering, 1-19 (2015). [2] Z. Hanani et al., Nano Energy 81, 105661 (2021).
8:20 AM
Survey of Simple Halide Perovskites Using NSMM: Steven Tidrow1; 1Alfred University
Halide perovskites are of recent interest for photovoltaics. With roughly 1664 potential “simple” halide perovskites alone, how does one reasonably reduce the search space to identify those that form without excessively investigating those that won’t form? Currently, less than 16% of the 1664 potential simple halide perovskites are reported to form. Researchers continue to primarily utilize Goldschmidt’s tolerance factor formalism (GTFF), a nearly 100-year-old correlation relation, to investigate formation of perovskites. Here, the utility of the “new simple material model” (NSMM) is shown to be on par with GTFF for identifying roughly 90% of the simple halide perovskites that form; yet, NSMM outperforms GTFF, about 70% to 10%, respectively, for identifying potential simple halide perovskites that don’t form. Hence, the advantage of NSMM to rapidly and significantly reduce the field of search of novel simple halide perovskites is demonstrated. Additional benefits of NSMM are also discussed.
8:40 AM
Remote Sensing Powered by a Stacked Piezoelectric Transducer Harvesting Vibrational Energy: Wasim Hafiz Dipon1; Bryan Gamboa1; Ruyan Guo1; Amar Bhalla1; 1University of Texas at San Antonio
This research demonstrates a fully functional remote multi-sensing system powered solely by the energy harvested from the mechanical vibration of road traffic using a stacked piezoelectric transducer. The transducer is built using 20mm˟20mm˟2mm PZT ceramics plates. The electric charges from the damped sinusoidal signal of the stacked PZT transducer are collected using a custom-designed energy converter to charge a battery pack that powers the electronic circuit. The developed system consists of passive sensors built from piezoelectric materials and hence do not consume power. The remote sensing system is capable of accurately sensing pressure, the number of times forces are exerted, and temperature. A low-power Bluetooth module is used to transmit sensory data to a nearby Android device. Successful data transmission was achieved to a considerable distance from the system. The power generated from the stacked PZT transducer is sufficient enough to ensure the sustainability of the sensing system.
9:00 AM
Structure and Electrical Properties of Metrically Cubic PMN-PT Thin Films around the Morphotropic Phase Boundary: Matjaž Spreitzer1; Urška Trstenjak1; Nina Daneu1; Iegor Rafalovskyi2; Jamal Belhadi1; Aleksander Matavž1; Vid Bobnar1; Jiři Hlinka2; 1Jožef Stefan Institute; 2Institute of Physics of the Czech Academy of Sciences
Understanding the relationship between structural characteristics and the functional properties of complex relaxor ferroelectric thin films is of high interest for designing materials with high performances. In this work, the structure of epitaxial relaxed pulsed-laser-deposited Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT; x = 25, 33 and 40) thin films on LaNiO3/SrTiO3 substrates was analyzed using a variety of diffraction and spectroscopic techniques. While, based on the data obtained from high-resolution X-ray diffraction and scanning transmission electron microscopy analysis, the average structure of the PMN-xPT films is metrically cubic, micro-Raman polarimetry measurements indicate the tetragonal-like ferroelectric phase with a marked preference for the polarization perpendicular to the film for all three compositions. The results of the Raman scattering analysis are supported by the electromechanical properties of the samples, which clearly show that the films have a locally non-centrosymmetric structure.
9:20 AM
Determining the Effect of Burn-in Process on Reliability of X7R Multilayer Ceramic Capacitors: Pedram Yousefian1; Clive Randall1; 1Penn State University
Base metal electrode (BME) multilayer ceramic capacitors (MLCC) are rapidly advancing in higher volumetric capacitance, higher voltage, and higher temperature operations. BME MLCCs are being considered for aerospace, medical, and military applications, necessitating higher levels of reliability. Thus, it is essential to determine the reliability of MLCCs in terms of their lifetime. The burn-in test has been used to eliminate components with higher likelihood of infant mortality failures and to provide higher reliability components. In this process, components are exposed to high temperatures and high voltages relative to their design. This study demonstrates that the burn-in test led to intragranular and transgranular electromigration of oxygen vacancies, which will not be relaxed after the burn-in test and led to changes in reliability and lifetime of MLCCs. Dynamics of oxygen vacancies under burn-in test are studied via thermal stimulated depolarization current (TSDC), impedance spectroscopy, and in situ high accelerated lifetime testing (HALT).