Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/11829
ชื่อเรื่อง: 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
ผู้แต่ง: Yotthuan S.
Charoonsuk T.
Vittayakorn N.
Thountom S.
Suriwong T.
Udeye T.
Bongkarn T.
Keywords: Amino acids
Calcination
Combustion
Dielectric properties
Grain size and shape
Microstructure
Particle size
Particle size analysis
Rietveld refinement
Sintering
X ray diffraction analysis
Average grain size
Average particle size
Calcination temperature
Combustion method
Combustion technique
Crystalline morphologies
Ferroelectric behavior
Refinement techniques
Morphology
วันที่เผยแพร่: 2020
บทคัดย่อ: The effect of the firing conditions on the phase formation, microstructure, and electrical properties of (K0.5Na0.5)(Nb0.7Ta0.3)O3 (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/cm3), the highest dielectric constant (εC = 5002), and good ferroelectric behavior (Pr = 18.50 μC/cm2 and Ec = 9.04 kV/cm). © 2020, The Minerals, Metals & Materials Society.
URI: https://ir.swu.ac.th/jspui/handle/123456789/11829
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85089258955&doi=10.1007%2fs11664-020-08374-6&partnerID=40&md5=22ed06b50f1d044d00bf2bde2790dfc3
ISSN: 3615235
Appears in Collections:Scopus 1983-2021

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