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- 저자 : Kamonpan Pengpat (검색결과 4 건)
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Dielectric and impedance measurements on (1-x)Ba(Fe1/2Ta1/2) O3-xBa(Zn1/3Ta2/3)O3 ceramics
Thanatep Phatungthane,Gobwute Rujijanagul,Kamonpan Pengpat,Sukum Eitssayeam,Tawee Tunkasiri,Luiz F. Cotica,Ruyan Guo,Amar S. Bhalla 한국물리학회 2014 Current Applied Physics Vol.14 No.12
In this work, ((1x)Ba(Fe1/2Ta1/2)O3-xBa(Zn1/3Ta2/3)O3), ((1x)BFT-xBZT) ceramics with x ¼ 0.00e0.12 were synthesized by the solidestate reaction method. X-ray diffraction data revealed that both the powders and ceramics were of a pure-phase cubic perovskite structure. All ceramics showed large dielectric constants. For the x ¼ 0.12 sample, a very high dielectric constant (>20,600) was observed. A lowering in the dielectric loss compared to pure BFT ceramics was observed with the BZT addition. The impedance measurements indicated that BZT has a strong effect on the bulk grain and grain boundary resistance of BFT ceramics. These results are in agreement with the measured dielectric properties. Based on dielectric and impedance results, (1x)BFT-xBZT ceramics could be of great interest for high performance dielectric materials applications due their giant dielectric constant behavior.
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Sukum Eitssayeam,Uraiwan Intatha,Kamonpan Pengpat,Gobwute Rujijanagul,Kenneth J.D. MacKenzie,Tawee Tunkasiri 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Relaxor ferroelectrics with A'A"(B'B")O₃- type perovskite structures have attracted much attention because of their excellent dielec-tric and electromechanical properties. The physical properties or device parameters of PZT can be tailored by improved synthesis andprocessing techniques and by making suitable substitutions into the A and/or B sites. In this study, Pb0.84Ba0.16(Zr0.44Ti0.40-Fe0.08Nb 0.08)O₃ ceramics were prepared by solid state reaction and the eect of the processing parameters on the ferroelectric, dielectricand pyroelectric properties was determined. Optimal dielectric properties were achieved in Pb0.84Ba0.16(Zr0.44Ti0.40Fe0.08Nb 0.08)O₃ ceramics by calcination at 1100.C and sintering at 1250℃. Hysteresis loop measurements of these materials indicated a remanent polarization(Pr) and spontaneous polarization (Ps) of 15.88 μC/cm² and 26.29 μC/cm², respectively. TEM micrographs showed nano-domains in thecalcined powder conrming their ferroelectric properties. The dielectric properties also show ferroelectric behavior, with a Curie temper-ature of approximately 220℃. The values ofpi show a continuous increase with increasing temperature up to a maximum value. 800 nC/cm² K at~120℃.
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Effects of NiO Nanoparticles on Electrical and Magnetoelectric Properties of BNT Based Ceramics
Chatchai Kruea-In,Thitima Glansuvarn,Sukum Eitssayeam,Kamonpan Pengpat,Gobwute Rujijanagul 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.6
The properties of 0.94BNT-0.06BT/xNiO lead-free nanocomposites were investigated. The NiO additive influenced dielectric properties as well as the phase transition behavior of the samples. Dielectric properties under applied magnetic fields were also measured. After addition of the additive, the loss tangent could be controlled by an applied magnetic field. Furthermore, the P-E hysteresis loop changed from a normal hysteresis loop for the unmodified sample to a constricted loop for the x = 0.5 and 1.0 vol. % samples, and then became a lossy capacitor hysteresis loop for the x = 2.0 vol. % sample. These results suggest that NiO nanoparticles have a strong influence on the properties of the composites.
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Morphology of Potassium Sodium Niobate based Silicate Glass System
Ploypailin Yongsiri,Sukum Eitssayeam,Somnuk Sirisoonthorn,Kamonpan Pengpat 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.6
In this research, the fabrication of lead-free ferroelectric glass-ceramics from the (K0.5Na0.5)NbO3 system via incorporation method was carried out. For the incorporation method, calcined KNN was added into glass batches as a heterogeneous nucleating agent. Glass-ceramics KNNs were prepared from two compositions of KNN-SiO2with a ratio of 75 : 25 (C1) and 80 : 20 (C2) mol.%. Thermal properties resulting from DTA showed samples C1and C2 having glass transition temperatures of 532°C and 520°C and crystallization temperatures of 645°C and 620°C, respectively. The prepared glasses were subsequently subjected to a heat treatment schedule in a temperature range of 500°C - 575°C for crystallization. XRD results showed that the KNN phase occurred in C1. The C2 glass-ceramic samples contained unidentified phases together with the KNN phase. From SEM observation,it was found that bulk crystals with an equiaxed shape of KNN phase dispersed well in all glass-ceramic matrices. Crystal sizes increased with increasing heat treatment temperatures. In C2 glass-ceramics, unidentified phases were found together with the KNN phase.
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