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Jo, Wook
Sustainable Functional Ceramics Lab.
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Sintering Aid-Assisted Growth of 0.95(K0.5Na0.5)NbO3-0.05(Bi0.5Na0.5)(Zr0.85Sn0.15)O-3 Single Crystals by the Solid-State Crystal Growth Method and Their Characterization

Author(s)
Uwiragiye, EugeniePham, Thuy LinhFisher, John G.Lee, Jong SookLee, Byoung WanKo, Jae HyeonKim, Hwang PillJo, Wook
Issued Date
2022-10
DOI
10.1002/pssa.202100875
URI
https://scholarworks.unist.ac.kr/handle/201301/58432
Fulltext
https://onlinelibrary.wiley.com/doi/10.1002/pssa.202100875
Citation
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, v.219, no.20, pp.2100875
Abstract
In this work, 0.95(K0.5Na0.5)NbO3-0.05(Bi0.5Na0.5)(Zr0.85Sn0.15)O-3 (KNN-BNZS) lead-free piezoelectric single crystals are grown by the solid-state crystal growth (SSCG) method and their phase transitions and properties characterized. Addition of an appropriate amount of Li2CO3 and Bi2O3 sintering aids considerably promotes single-crystal growth. Chemical composition of the single crystal is similar to the nominal composition with a slight deficiency in Na and K as evaluated by electron probe microanalysis (EPMA). X-Ray diffraction (XRD), electrical property measurements, and temperature-controlled Raman scattering reveal that the phase transition near room temperature is from a rhombohedral to an orthorhombic or tetragonal phase. Wide temperature range Raman scattering and dielectric properties consistently indicate transitions associated with the phase transformations or boundaries of a phase coexistence region and further details. Nontrivial frequency dependence of dielectric properties is successfully parameterized by capacitance relaxations described by Debye and Cole-Cole responses with special constant phase elements with fixed exponents of 0.5 (Warburg elements). High-frequency dielectric constants and additional dielectric relaxations and dc relaxations are deconvoluted. The modeling parameters indicate the phase transition temperatures (or boundaries of the phase coexistence region) unambiguously. Polarization-electric field and bipolar strain-electric field hysteresis loops show that the single crystal is a classic lossy ferroelectric material.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1862-6300
Keyword (Author)
lead-free piezoelectric materialsphase transitionssingle-crystal growthsintering aids
Keyword
POTASSIUM-SODIUM NIOBATEABNORMAL GRAIN-GROWTHLEAD-FREE CERAMICSPIEZOELECTRIC PROPERTIESPHASE-TRANSITIONSMICROSTRUCTURAL EVOLUTIONELECTRICAL-PROPERTIESRAMAN-SCATTERINGHIGH-TEMPERATURELIQUID-PHASE

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