Effect of Firing Conditions on Phase Formation, Microstructure, and Electrical Properties of (K0.5Na0.5)(Nb0.7Ta0.3)O3 Ceramics Synthesized by Solid-State Combustion Method

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dc.contributor.authorYotthuan, Surirat
dc.contributor.authorCharoonsuk, Thitirat
dc.contributor.authorVittayakorn, Naratip
dc.contributor.authorThountom, Sarawut
dc.contributor.authorSuriwong, Tawat
dc.contributor.authorUdeye, Thanya
dc.contributor.authorBongkarn, Theerachai
dc.date.accessioned2026-08-06T10:29:45Z
dc.date.available2026-08-06T10:29:45Z
dc.date.issued2020-10-01
dc.description.abstractThe effect of the firing conditions on the phase formation, microstructure, and electrical properties of (K<inf>0.5</inf>Na<inf>0.5</inf>)(Nb<inf>0.7</inf>Ta<inf>0.3</inf>)O<inf>3</inf> (KNNT) ceramics synthesized by the solid-state combustion technique using glycine as fuel has been investigated. All samples were calcined at 600°C to 800°C for 2 h and sintered at 1150°C to 1190°C for 2 h to 5 h. Pure KNNT powders were produced after calcination at 600°C for 2 h. The average particle size increased when the calcination temperature was increased. The KNNT powder calcined at 600°C for 2 h showed rather square morphology with average particle size of ∼ 160 nm. The x-ray diffraction (XRD) analysis results for the ceramics revealed the presence of orthorhombic (O) and tetragonal (T) phases in all samples. When sintering at 1150°C for 4 h, the O:T ratio was 50:50, as verified by the Rietveld refinement technique. The average grain size, density values, and dielectric properties tended to increase when the dwell time was increased from 2 h to 4 h, but then degraded. The KNNT ceramic produced at the optimum firing condition (1150°C for 4 h) showed good crystalline morphology, the highest density (ρ = 5.28 g/cm<sup>3</sup>), the highest dielectric constant (ε<inf>C</inf> = 5002), and good ferroelectric behavior (P<inf>r</inf> = 18.50 μC/cm<sup>2</sup> and E<inf>c</inf> = 9.04 kV/cm).
dc.identifier.citationJournal of Electronic Materials, 49(10), 6143-6155, 2020
dc.identifier.doi10.1007/s11664-020-08374-6
dc.identifier.issn03615235
dc.identifier.other2-s2.0-85089258955
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/11270
dc.sourceJournal of Electronic Materials
dc.subjectdielectric properties
dc.subjectfiring conditions
dc.subjectKNNT
dc.subjectrietveld refinement
dc.subjectsolid-state combustion method
dc.titleEffect of Firing Conditions on Phase Formation, Microstructure, and Electrical Properties of (K0.5Na0.5)(Nb0.7Ta0.3)O3 Ceramics Synthesized by Solid-State Combustion Method
dc.typeArticle

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