Muanghlua, Rangson

Preferred name

Muanghlua, Rangson

Alternative Name

Muanghlua, R.

Muanghlua, Rangsan

Main Affiliation

School of Engineering

rangson.mu@kmitl.ac.th

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The effects of geometrical capacitance components of LOCOS diode in VLSI
(2019-03-01)
Nissai, Itsariya
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Ruangphanit, Anucha
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Wongprasert, Yothin
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Muanghlua, Rangson
The effects of geometrical capacitance components of LOCal Oxidation of Silicon (LOCOS) diode in Very Large Scale Integrated circuit (VLSI) are proposed. For the correct circuit model simulation, the model of the device must be accurate and consistence with the SPICE models. The rectangular structure (L=400 μm, W=200 μm), the multi-fringe structure 1 (L=400 μm, W=4 μm, no. strips =50) and the multi-fringe structure 2 (L= S μm, W= Sμm, no. sample =1200) have been designed. These extraction methodologies show the area capacitance component, the peripheral capacitance component and the corner capacitance component at the field oxide side. The BSIM 3v3 junction capacitance models are proposed also. The comparison is made to check the accuracy of the parameter models. The results showed a low level error.
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Electrical properties of bismuth potassium titanate-strontium titanate ferroelectric ceramics
(2010-07-30)
Phetnoi, Prapapim
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Niemcharoen, Surasak
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Muanghlua, Rangson
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Sutapun, Manoon
;
Vittayakorn, Naratip
In this paper, lead-free (Bi<inf>0.5</inf>K<inf>0.5</inf>)TiO<inf>3</inf> ceramics doped with SrTiO<inf>3</inf> was prepared by the conventional solid state reaction method with sintering temperature at 1040°C. The samples were characterized by X-ray diffraction analysis and Scanning Electron Microscopy. The dielectric, ferroelectric properties were also investigated. The results of X-ray diffraction reveal that SrTiO<inf>3</inf> diffuse into the Bi <inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf> lattices to form a solid solution with a pure perovskite structure. After the introduction of SrTiO<inf>3</inf> into Bi<inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf>, the dielectric constant at room temperature (ε<inf>r</inf>) was found to decrease with increasing SrTiO<inf>3</inf>. The broadness of the dielectric constant peak was observed with increasing SrTiO<inf>3</inf> content, especially that of the 0.94Bi <inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf> - 0.06 SrTiO<inf>3</inf> ceramic which exhibited a very broad curve over a wide temperature range. The Bi <inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf> - SrTiO<inf>3</inf> system was expected to be a new and promising candidate for lead-free capacitors.
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Rapid synthesis of potassium sodium niobate (K 1/2Na 1/ 2NbO3) lead-free piezoelectric powder using the combustion method
(2013-12-01)
Chaiyo, Nopsiri
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Muanghlua, Rangson
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Wongprasert, Yothin
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Seeharaj, Panpailin
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Vittayakorn, Naratip
Potassium sodium niobate (K1/<inf>2</inf>Na1/<inf>2</inf>NbO<inf>3</inf>) powder was synthesized successfully by the combustion synthesis. The raw materials of KNO<inf>3</inf>, NaNO<inf>3</inf> and Nb<inf>2</inf>O<inf>5</inf> were used with glycine as fuel. The thermal behaviour of the precursor was determined using thermo gravimetric analysis (TGA) and derivative thermo gravimetric (DTG) analysis. The conditions for preparing perovskite phase formation, influence of the fuel-to-oxidizer molar ratio, and crystal structure were characterized by the X-ray diffraction technique (XRD) and Fourier transform infrared (FTIR) spectroscopy. The morphology and particle size were investigated through a scanning electron microscope (SEM). © 2013 Copyright Taylor and Francis Group, LLC.
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Characterization and properties of BaTi3O3/MgO nanocomposite ceramics
(2011-12-19)
Vittayakorn, W. C.
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Bunjong, D.
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Muanghlua, R.
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Vittayakorn, N.
In this research, BaTiO<inf>3</inf>./xMgO nanocomposite ceramics, where x = 0, 0.3, 0.5, 0.7 and 1.0 vol%, were prepared by a mixedoxide method. The effect of MgO additions on the phase formation, microstructure and dielectric properties of this system was investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM) and dielectric spectroscopy, respectively. From the results, XRD analysis showed that there is no unwanted phase except BaTiO <inf>3</inf> and MgO observed in these ceramics. Abnormal grain growth was found in pure BaTiO<inf>3</inf> ceramic with a 75.32 μm average grain size. After adding MgO nanoparticles into the system, the grain size significantly decreased to 0.55 μm and continuously decreased with increasing MgO content. For the dielectric properties, the pure BT ceramic exhibits a sharp and high dielectric peak whereas a low and broad peak is found in BT/MgO nanocomposite ceramics, which can be explained by the composite structure.
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Development a novel model of threshold voltage of NMOS with temperature dependence and narrow channel width
(2016-09-06)
Ruangphanit, A.
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Poyai, A.
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Muanghlua, R.
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Niemcharoen, S.
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Titiroongruang, W.
In paper, a development a novel model of threshold voltage of NMOS with temperature dependence and narrow channel width was presented. The models have been developed including the temperature affect of surface potentials, intrinsic carrier concentration and energy band gap. The threshold voltages were measured by the linear extrapolation methodology. The temperature dependence and the body-bias dependence of threshold voltage model of a big NMOS and a narrow channel width NMOS are proposed. The results show that, the measured threshold voltage compared with the development threshold voltage model was low level error.
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Phase transition behaviour and electrical properties of lead-free (K 0.5Na0.5)NbO3-LiNbO3-LiSbO 3 piezoelectric ceramics
(2011-05-01)
Muanghlua, Rangson
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Niemcharoen, Surasak
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Sutapun, Manoon
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Boonchom, Banjong
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Vittayakorn, Naratip
The ternary system of 0.945(K<inf>0.5</inf>Na<inf>0.5</inf>NbO <inf>3</inf>)-(0.055 - x)LiNbO<inf>3</inf>-xLiSbO<inf>3</inf> [0.945KNN-(0.055 - x)LN-xLS]; x = 0.0-0.055 lead-free piezoelectric ceramics was fabricated by the conventional mixed oxide method with normal sintering. The crystal structure was studied by means of X-ray diffraction (XRD). The results of XRD patterns show that complete solid solutions of the mixed phase between the orthorhombic and tetragonal perovskite phase were observed. The DSC and dielectric data show that the amount of LiSbO<inf>3</inf> in K<inf>0.5</inf>Na<inf>0.5</inf>NbO <inf>3</inf>-LiNbO<inf>3</inf> solid solution slightly decreases the paraelectric cubic-ferroelectric tetragonal phase transition (T<inf>C</inf>) to a low temperature. Furthermore, good dielectric and piezoelectric properties were observed at composition, x = 0.03. The polymorphic phase transition between the orthorhombic and tetragonal phases plays a very important role in enhancement of the piezoelectric properties of KNN-LN-LS ceramics. © 2010 Elsevier B.V. All rights reserved.
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Utilization of eggshell as a low-cost precursor for synthesizing calcium niobate ceramic
(2018-07-18)
Kamkum, Phonphan
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Vittayakorn, Wanwilai
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Seeharaj, Panpailin
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Woramongkolchai, Somsak
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Muanghlua, Rangson
This study investigated the possibility of using calcium carbonate (CaCO<inf>3</inf>) from chicken eggshell biowaste as a starting material for synthesizing calcium niobate (CaNb<inf>2</inf>O<inf>6</inf>) powder through the conventional solid-state reaction. Phase formation of calcium niobate was studied as a function of calcination conditions by X-ray diffraction (XRD), Fourier transform infrared spectroscopy and Raman spectroscopy. The X-ray fluorescence results showed that the chicken eggshell contained more than 96·0% of calcium carbonate by weight. The structural characteristics of the calcium carbonate and calcium niobate powder were quantitatively evaluated by Rietveld refinement method from the XRD data. Rietveld refinement results verified that the eggshell powder exhibited a rhombohedral calcite (calcium carbonate) structure with lattice parameters a = b = 4·9812 ± 0·00059 Å (1Å = 0·1 nm) and c = 17·0342 ± 0·00292 Å with α = γ = 90° and β = 120°. Furthermore, the single phase of calcium niobate corresponded to the orthorhombic structure for space group Pbcn(60) obtained after the calcination process. The non-isothermal kinetic of calcium niobate was investigated by the Ozawa methods. Activated energy calculated using Ozawa methods was 1168 ± 29 kJ mol-1. Also, there was no significant difference in dielectric properties between calcium niobate ceramic using chicken eggshell waste as a starting material and calcium niobate ceramic using analytical-reagent-grade calcium carbonate. This study showed that calcium carbonate from chicken eggshell biowaste is an alternative starting material for synthesizing microwave dielectric calcium niobate ceramic.
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Application of chicken eggshell waste as a starting material for synthesizing calcium niobate (Ca4Nb2O9) powder
(2015-07-01)
Kamkum, Phonphan
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Atiwongsangthong, Narin
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Muanghlua, Rangson
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Vittayakorn, Naratip
This study focused on the possibility of using CaCO<inf>3</inf> from chicken eggshell waste as a starting material for synthesizing Ca<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> powder via a conventional solid state reaction. The heat behavior of CaCO<inf>3</inf> and Nb<inf>2</inf>O<inf>5</inf> raw material mixture was studied by thermogravimetric analysis (TGA). Phase formation of Ca<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> was studied as a function of calcination conditions by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and X-ray diffraction (XRD). The morphology and microstructure were charaterized via Scanning electron microscope (SEM). The X-ray fluorescence (XRF) results showed that the chicken eggshell contained more than 96.0% of CaCO<inf>3</inf> by weight. The XRD pattern peaks matched the peaks of calcite CaCO<inf>3</inf> ICDD No. 85-11108 very well. Furthermore, the XRD results and Rietveld refinement analysis confirmed that the purity and single phase of Ca<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> corresponded to the monoclinic structure (ICDD: 49-0911) obtained after the calcination process. The non-isothermal kinetic of Ca<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> also was investigated by the Ozawa methods. This study indicated that CaCO<inf>3</inf> from chicken eggshell waste is an alternative starting material for synthesizing Ca<inf>4</inf>Nb<inf>2</inf>O<inf>9</inf> powder.
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A rapid synthesis of blue-pigment copper cyclotetraphosphate (cu2P4O12) ricelike grain nanoparticles at low temperature
(2012-12-01)
Chatjuthamanee, Warunthip
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Muanghlua, Rangson
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Boonchom, Banjong
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Vittayakorn, Naratip
A blue-pigment copper cyclotetraphosphate Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> was synthesized by a simple wet preparation method using copper oxide and phosphoric acid at 350 °C. The crystallite size obtained from X-ray line broadening is 53 ± 11 nm for the Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf>. The FTIR spectrum of Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> is assigned a base on the P<inf>4</inf>O<inf>12</inf>4- ion in the structure, which indicates the most striking feature of cyclotetraphospate. XRD and FTIR results of the synthesized CuCu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> indicate the pure monoclinic phase with space group C<inf>2h</inf>6 (C2/c). SEM micrographs of the synthesized Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> show rice-like grains, a porous structure and agglomerations, which are important for a specific application. The UV-Vis-NIR spectrum confirms the octahedral coordination of the Cu (II) ion and blue pigment.
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Measured and Extraction of Coupling Capacitive of Metal Interconnect Layers in VLSI
(2018-07-02)
Ruangphanit, Anucha
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Nissai, Itsariya
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Pedlub, Rujipad
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Muanghlua, Rangson
This paper presents the measurement and extraction of the capacitance for multilayer interconnections in VLSI. The capacitance of the capacitive coupling between interconnect is measured as a function of the varying frequency in order to develop a capacitance versus frequency curve. The multi-fringe structure of interconnect metal1 layer and interconnect metal2 layer \pmb{(\text{L}=400\mu \text{m}, \ \text{no}. \ \text{strip} =80)} with the total perimeter of capacitive coupling is approximately \pmb{3.16\times 10 {4}} \pmb{\mu} \mathbf{m} of value and the area is \pmb{2.8\times 10 {4}} \ \pmb{\mu\text{m} {2}} of value are tested respectively. The line width and line spacing ratio (W/S) of interconnect is varying from 0.9/0.6, 0.9/0.9, 0.9/1.05 and 0.9/1.2 with the measured frequency of 10kHz, 100kHz, 250kHz, 500kHz, IMHZ and 5 MHz are measured. The coupling of interconnect per unit length at various line spacing as a function of measured frequency of metal1 and metal2 are reported and discussed. The results show that the coupling capacitance per unit length \pmb{(\text{F}/\mu \text{m})} increases as the spacing between adjacent interconnect lines is deceased.

Muanghlua, Rangson

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