Journal of Powder Materials

Research Articles

[English]
Phase Formation Behavior and Piezocatalytic Properties of Sodium Bismuth Titanate-Based Perovskite Fine Powders Prepared by Ultrasonic Spray Pyrolysis: Hee Yeon Jeon, Jae Min Park, Ju Eun You, Young-In Lee; J Powder Mater. 2026;33(3):239-248. Published online June 30, 2026; DOI: https://doi.org/10.4150/jpm.2026.00129

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Abstract PDF: Sodium bismuth titanate (Na0.5Bi0.5TiO3, NBT) is a representative lead-free piezoelectric ceramic with ferroelectric and piezoelectric properties, promising candidate for piezocatalytic applications driven by mechanical vibration. In this study, NBT-based perovskite fine powders were prepared by ultrasonic spray pyrolysis (USP), a continuous aerosol process based on droplet-level reaction control. The effect of pyrolysis temperature, varied from 700oC to 950oC, on phase formation and particle morphology was investigated. At lower temperatures, Bi-based secondary phases predominated, whereas the perovskite phase gradually developed with increasing temperature. The powder synthesized at 950oC exhibited a well-defined perovskite crystal structure with improved crystallinity. FE-SEM analysis showed that the powders consisted of spherical particles with an average size of approximately 750 nm, without severe interparticle agglomeration. EDS analysis confirmed a relatively homogeneous distribution of Na, Bi, Ti, and O, with Na-rich composition, consistent with Na-rich precursor condition. Piezoresponse force microscope (PFM) measurements verified the ferroelectric and piezoelectric responses of the powder synthesized at 950oC. In Rhodamine B degradation tests under probe-type ultrasonication, adding the NBT-based powder increased the reaction rate constant from 7.96×10-3 to 1.16×10-2 min-1. These results suggest that USP is a feasible continuous process for preparing NBT-based perovskite fine powders for lead-free piezocatalytic applications.

[Korean]
Development of Composite-film-based Flexible Energy Harvester using Lead-free BCTZ Piezoelectric Nanomaterials: Gwang Hyeon Kim, Hyeon Jun Park, Bitna Bae, Haksu Jang, Cheol Min Kim, Donghun Lee, Kwi-Il Park; J Powder Mater. 2024;31(1):16-22. Published online February 28, 2024; DOI: https://doi.org/10.4150/KPMI.2024.31.1.16

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Composite-based piezoelectric devices are extensively studied to develop sustainable power supply and selfpowered devices owing to their excellent mechanical durability and output performance. In this study, we design a leadfree piezoelectric nanocomposite utilizing (Ba_0.85Ca_0.15)(Ti_0.9Zr_0.1)O₃ (BCTZ) nanomaterials for realizing highly flexible energy harvesters. To improve the output performance of the devices, we incorporate porous BCTZ nanowires (NWs) into the nanoparticle (NP)-based piezoelectric nanocomposite. BCTZ NPs and NWs are synthesized through the solidstate reaction and sol-gel-based electrospinning, respectively; subsequently, they are dispersed inside a polyimide matrix. The output performance of the energy harvesters is measured using an optimized measurement system during repetitive mechanical deformation by varying the composition of the NPs and NWs. A nanocomposite-based energy harvester with 4:1 weight ratio generates the maximum open-circuit voltage and short-circuit current of 0.83 V and 0.28 A, respectively. In this study, self-powered devices are constructed with enhanced output performance by using piezoelectric energy harvesting for application in flexible and wearable devices.

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