Muanghlua, Rangson

Preferred name

Muanghlua, Rangson

Alternative Name

Muanghlua, R.

Muanghlua, Rangsan

Main Affiliation

School of Engineering

rangson.mu@kmitl.ac.th

Now showing 1 - 10 of 13

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The diamond crystal nucieation by combustion activation CVD
(2008-12-01)
Wongprasert, Y.
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Muanghlua, R.
;
Sato, K.
This paper presents the diamond nucleation using combustion activation chemical vapor deposition (CACVD) by 0.95 volumetric ratio of O 2/C2H2 under atmospheric pressure. The main point of our work is to develop the CACVD technique for synthesize the semiconductor materials, which is developed for electronic devices application. The surface nucleation of substrate was studied by using surface pretreatment. The results of surface nucieation on mirror-silicon, polished silicon by diamond powder, silicon-dioxide (Sio<inf>2</inf>), and polished Sio<inf>2</inf> by diamond powder, are significantly different. It can be concluded that the silicon-dioxide mask technique is useful for nucleated diamond protection whereas the polished silicon by diamond powder is suitable for nucleated diamond generation. These techniques are applied for the pattern fabrication. © 2008 Trans Tech Publications, Switzerland.
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Synthesis, phase formation and characterization of Co4Nb 2O9 powders synthesized by solid-state reaction
(2008-12-01)
Chaiyo, N.
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Muanghlua, R.
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Ruangphanit, A.
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Vittayakorn, W. C.
;
Vittayakorn, N.
A corundum-type structure of cobalt niobate (Co<inf>4</inf>Nb 2O<inf>9</inf>) has been synthesized by a solid-state reaction. The formation of the Co<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> phase in the calcined powders was investigated as a function of calcination conditions by differential thermal analysis (DTA) and X-ray diffraction (XRD) techniques. Morphology and particle size have been determined by scanning electron microscopy (SEM). It was found that the minor phases of unreacted Co <inf>3</inf>O<inf>4</inf> tend to form together with the columbite CoNb <inf>2</inf>O<inf>6</inf> phase at a low calcination temperature and short dwell time. It seems that the single-phase of Co<inf>4</inf>Nb<inf>2</inf>O <inf>9</inf> in a corundum phase can be obtained successfully at the calcination conditions of 900°C for 60 min, with heating/cooling rates of 20°C /min. © 2008 Trans Tech Publications, Switzerland.
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Preparation of lead zirconate-lead nickel niobate ceramics by the reaction sintering process
(2009-12-01)
Wirunchit, Supamas
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Muanghlua, Rangson
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Niemcharoen, Surasak
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Vittayakorn, Wanwilai C.
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Laoratanakul, Pitak
The perovskite structure of lead zirconate - lead nickel niobate ceramics, (1-x) PbZrO3-xPb(Ni1/3Nb2/3)O3 (PZ - PNN) at x between 0.00-0.50, has been prepared by the reaction-sintering process. The specimens were prepared directly from a mixture of their constituent oxide without any calcination step. The PZ - PNN ceramics could be obtained after 6 h sintering at 1,100-1,250°C. Crystal structure and phase transition of PZ-PNN were investigated by x-ray diffraction (XRD). XRD indicated that the structure of PZ-PNN ceramics is orthorhombic for a composition where x = 0.00, rhombohedral for compositions where x = 0.10 ≤ x ≤ 0.40 and pseudo-cubic for a composition where x = 0.50. The dielectric properties of the ceramics were measured as functions of both temperature and frequency. The results indicated that the transition temperature decreases with increasing PNN concentration. Furthermore, morphology and grain size evolution have been determined via a scanning electron microscope (SEM). Copyright © Taylor & Francis Group, LLC.
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Effect of annealing on the structure and dielectric properties in PZT-PCoN ceramics
(2008-01-01)
Vittayakorn, N.
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Chaiyo, N.
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Muanghlua, R.
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Ruangphanit, A.
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Vittayakorn, W. C.
The solid solution between the normal ferroelectric Pb(Zr <inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf> (PZT) and relaxor ferroelectric Pb(Co<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> (PCoN) was synthesized by the solid state reaction method. Sintered PZT-PCoN ceramics were annealed at temperatures ranging from 850 to 1, 100°C for 4 h. X-ray diffraction patterns revealed changes of crystalline structure after annealing, which could be correlated to the accompanied changes in dielectric properties. Furthermore, significant improvements in the dielectric responses were observed in this system. After annealing, a huge increase of up to 200% occurred in the dielectric constants, especially near the temperature of maximum dielectric constant. © 2008 Trans Tech Publications, Switzerland.
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Effects of Zr/Ti ratio on the structure and ferroelectric properties in PZT-PZN-PMN ceramics near the morphotropic phase boundary
(2008-01-01)
Muanghlua, R.
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Niemchareon, S.
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Vittayakorn, W. C.
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Vittayakorn, N.
The piezoelectric ceramics of Pb(Zr<inf>x</inf>Ti<inf>1-x</inf>)O <inf>3</inf> - Pb(Zn<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> - Pb(Mn <inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf>; PZT-PZN-PMN with Zr/Ti ratios of 48/52, 50/50 and 52/48 were fabricated in order to investigate the effect of compositional modifications on the ferroelectric properties of PZT-PZN-PMN ceramics. The phase structure of ceramics sintered at 1,150°C was analyzed. Results show that the pure perovskite phase was in all ceramic specimens, and the phase structure of PZT-PZN-PMN piezoelectric ceramics transformed from tetragonal to rhombohedral, with the Zr/Ti ratios increased in the system. The PZT-PZN-PMN ceramics with a Zr/Ti ratio of 50/50 exhibited the most promising properties including high remanent polarization and low coercive field of 25.95 μC cm-2 and 12.5 kV cm-1, respectively. Furthermore, the transition temperature decreased when the Zr/Ti ratio increased in the system. © 2008 Trans Tech Publications, Switzerland.
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Influence of fabrication processing on perovskite phase formation of KNN-BZT
(2008-01-01)
Sutapun, M.
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Muanghlua, R.
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Huang, C. C.
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Cann, D. P.
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Vittayakorn, W. C.
The binary system of (1-x)(K<inf>1/2</inf>Na<inf>1/2</inf>)NbO <inf>3</inf>-xBi(Zni/2Ti<inf>1/2</inf>)O<inf>3</inf>; x = 0.0-0.30 ceramics was fabricated by conventionally mixed oxide and two-stage mixed oxide methods. Phase development of calcined powders and the crystal structure of sintered ceramics were analyzed by X-ray diffraction (XRD). The microstructure analyses were undertaken by scanning electron microscopy (SEM). In the conventional method, the perovskite phases were obtained for compositions containing only 10 mol % KNN. For compositions above this amount, a complex mixture of phases was observed. However, the complete solid solution of perovskite phase, prepared by two-stage mixed oxide, was retained up to 20 mole % BZT content. The experiments in this study suggest that the two-stage mixed oxide method helps to stabilize the perovskite phase better, when compared with the conventional method. © 2008 Trans Tech Publications, Switzerland.
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Synthesis, crystal structures, phase transition characterization and thermal properties of the (1-x)PbZrO3-xPb(Co1/3Nb 2/3)O3 solid solution system
(2008-12-01)
Banlue, W.
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Muanghlua, R.
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Vittayakorn, W. C.
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Vittayakom, N.
The phase transition behavior of the (1-x) PbZrO<inf>3</inf>-xPb(Co <inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> (PZCN) solid solution system (0 ≤ x ≤ 0.30) has been investigated by X-ray diffraction and DSC. In the solid solution, for x ≤ 0.20, the transition shows a first-order phase transition behavior and its antiferroelectric (AFE) crystal structure is orthorhombic. The transition temperature gradually decreases with increased Co2+/Nb5+ concentration. On the composition range 0.20 ≤x≤ 0.30, a typical relaxor-like behavior is displayed. The low temperature crystal structure is pseudo-cubic in this composition range. With these data, the ferroelectric phase diagram between PZ and PCoN has been established. © 2008 Trans Tech Publications, Switzerland.
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Preparation and properties of lead free bismuth sodium titanate-bismuth zinc titanate ceramics
(2009-12-01)
Muanghlua, Rangson
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Niemcharoen, Surasak
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Vittayakorn, Wanwilai C.
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Tungsitvisetkul, Nattapong
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Chinwaro, Pimjan
Lead-free piezoelectric ceramics based on (1-x)Bi1/2Na1/2TiO3 - x Bi(Zn1/2 Ti1/2)O3 (x = 0.0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.20, 0.30, 0.40, and 0.5) were obtained via solid-state processing techniques. The influence of BZT addition on BNT characteristics, sintering, microstructure and properties was investigated. A single perovskite phase with rhombohedral symmetry was obtained for Bi(Zn1/2Ti1/2)O3 substitutions of up to 10 mole%. A small amount of BZT was effective for improving both sintering behavior and dielectric properties of BNT ceramics. Optimized dielectric properties were obtained for samples with a maximum density of ρ = 98.3% for the composition, x = 0.1. Copyright © Taylor & Francis Group, LLC.
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Synthesis and morphology evolution of lead-free piezoelectric K 1/2Na1/2NbO3 powder at low temperature
(2009-12-01)
Chaiyo, Nopsiri
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Ruangphanit, Anucha
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Muanghlua, Rangson
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Niemcharoen, Surasak
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Sangseub, Atchara
A synthetic route for modified solid state reaction has been developed for the synthesis of the perovskite phase of potassium sodium niobate, K1/2Na1/2NbO3 (KNN). Potassium oxalate monohydrate (K2C2O4.H2O) and sodium oxalate (Na2C2O4) were employed as a source of potassium and sodium, respectively. The formation of the K1/2Na1/2NbO3 phase was investigated as a function of calcination conditions by TG-DTA and XRD techniques. Morphology and particle size were determined via an SEM technique. It was found that the minor phases of Na2CO3 and K2CO3 tend to form together with K1/2Na1/2NbO3, depending on calcination conditions. The perovskite phase was successfully synthesized at a low temperature of 400°C. As calcination temperatures increased from 600° to 850°C, the KNN solid solution became more homogeneous, XRD peaks became narrower, and a pattern similar to that expected for orthorhombic K1/2Na1/2NbO3 was achieved after 600°C, as indicated by the separate peaks of 0 2 2 and 2 0 0. Copyright © Taylor & Francis Group, LLC.
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Study of silicon thermopile
(2000-12-01)
Muanghlua, R.
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Cheirsirikul, S.
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Supadech, S.
This research paper introduces a silicon thermopile sensor, which shows higher Seebeck coefficient than a metal thermopile sensor. The vacuum evaporation technique was used to fabricate this silicon-based thermopile with Titanium as parts of the sensor. By using the concept that different of temperature between junctions would induce voltage that corresponse to the temperature different and materials used for the device. This work starting from design, fabricate, and test the device. At the ends of this work, we successfully fabricated the sensor and tested. The results show that the sensor demonstrate higher Seebeck coefficient than the one from metal-base thermopile sensor. For the future work, the different materials will be used to fabricate the thermopile sensor and compared to the Seebeck coefficient of the one from silicon.

Muanghlua, Rangson

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