Boonchom, Banjong
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Boonchom, Banjong
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BOONCHOM, Banjong
Boonchom, B.
Boonchom, And Banjong
Boonchoma, Banjong
Boomchom, Banjong
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banjong.bo@kmitl.ac.th
12 results
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Item type:Publication, A rapid synthesis of cobalt cyclotetraphosphate Co2P 4O12 at low temperature(2013-05-01); The cobalt cyclotetraphosphate, Co<inf>2</inf>P<inf>4</inf>O<inf>12,</inf> was synthesized by evaporating a mixture of cobalt chloride hexahydrate, phosphoric acid and water at 70 °C, with further calcinations at 400 °C, 500 °C and 600 °C for 3 h. XRD results indicated that the Co <inf>2</inf>P<inf>4</inf>O<inf>12</inf> compounds obtained had only monoclinic phase with space group C<inf>2h</inf><sup>6</sup> (Z=4). From FT-IR spectra, vibrational modes corresponding to internal vibrations of the P <inf>4</inf>O<inf>12</inf><sup>4-</sup> anion were identified. The morphologies and crystallite sizes for the Co<inf>2</inf>P<inf>4</inf>O<inf>12</inf> obtained from SEM data and X-ray line broadening showed non-uniform particles and 37-68 nm, respectively. All characterization methods showed that the monoclinic phase of Co<inf>2</inf>P<inf>4</inf>O<inf>12</inf> could be synthesized at the low temperature of 400 °C with short time consumption. The temperature was about 400 °C lower than that used in the previous synthesis method with CoCl <inf>2</inf> as reactant, and resulted in a cost-, energy-, and time-saving method. © 2012 Elsevier Ltd and Techna Group S.r.l. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study on thermal transformation of CuHPO4.H2O obtained by acetone-mediated synthesis at ambient temperature(2012-11-01); Copper hydrogenphosphate monohydrate, Cu- HPO<inf>4</inf>.H<inf>2</inf>O, was synthesized for the first time through simple and rapid method using the mixing of copper carbonate and phosphoric acid in acetone medium at ambient temperature. The obtained CuHPO<inf>4</inf>.H<inf>2</inf>O decomposed in three stages via dehydration and deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The kinetic triplet parameters (E<inf>a</inf>, A, and n) and thermodynamic functions (δHz.ast;, δGz.ast;, and δS*) for the first two decomposed steps were calculated from DSC data. All the obtained functions indicate that the deprotonated HPO<inf>4</inf> <sup>2-</sup> reaction for the second step occurs at a higher energy pathway than the dehydration reaction for the first step. The calculated wavenumbers based on DSC peaks were comparable with FTIR results, which support the breaking bonds of OH (H<inf>2</inf>O) and P-OH (HPO<inf>4</inf> <sup>2-</sup>) according to decomposed mechanisms. All the calculated results are consistent and in good agreement with Cu- HPO<inf>4</inf>.H<inf>2</inf>O's thermal transformation mechanisms. © Akademiai Kiado, Budapest, Hungary 2012. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optical properties of Cu0.95Pt0.05Fe0.97Sn0.03O2 for p-type transparent conducting oxide materials(2013-08-30); ; ; The Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe<inf>0.97</inf>Sn<inf>0.03</inf>O<inf>2</inf> sample has been synthesized by a solid-state reaction to investigate optical properties of materials of transparent conducting oxide. Crystal structure was characterized by XRD. The Seebeck coefficient and electrical conductivity were measured in the high temperature (300 to 860 K), while the XPS and UV-VIS-NIR spectra were analyzed at room temperature. The XRD peaks confirm the samples forming the delafossite structure phase. The Seebeck coefficient reveals the samples displays the p-type conducting. The XPS spectra show the Sn2+ state stabling in this compound. The optical direct gap is 3.45 eV as a visible-transparent material. These results support that the Cu<inf>0.95</inf>Pt<inf>0.05</inf>Fe<inf>0.97</inf>Sn<inf>0.03</inf>O<inf>2</inf> oxide compounds, of which the Cu<sup>1+</sup> and Fe<sup>3+</sup> sites are substituted by the Pt<sup>1+</sup> and Sn<sup>2+</sup> ions respectively, are p-type transparent conducting oxide materials. © (2013) Trans Tech Publications, Switzerland. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A simple route to synthesize ferromagnetic binary calcium iron pyrophosphate CaFeP2O2 using aqueous-acetone media(2013-08-30); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal decomposition kinetics of FePO4·3H2O precursor to synthetize spherical nanoparticles FePO4(2007-12-19); Danvirutai, ChanaipornThe thermal decomposition of iron phosphate trihydrate FePO <inf>4</inf>·3H<inf>2</inf>O was investigated in air using TG-DTG/DTA. The FePO<inf>4</inf>·3H<inf>2</inf>O decomposes in two steps, and the final decomposition product (FePO<inf>4</inf>) was studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The activation energies of the second dehydration reaction of FePO<inf>4</inf>·3H<inf>2</inf>O were calculated through the isoconversional methods of Ozawa and Kissinger-Akahira-Sunose (KAS), and the possible conversion functions have been estimated through the Coats-Redfern method. The specificity of thermal decomposition was characterized by identification of the bonds to be selectively activated due to energy absorption at the vibrational level, which was assigned by comparing the calculated wavenumbers with the observed wavenumbers in FTIR spectra. The kinetic model that better describes the second reaction of dehydration for FePO <inf>4</inf>·3H<inf>2</inf>O is the F<inf>n</inf> model as a simple n-order reaction, and the corresponding function is xc4(α) = (1-α)<sup>2.50</sup> and g(α) = -[1-(1-α)<sup>-1.50</sup>/(1. 50)]. © 2007 American Chemical Society. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Facile, alternative synthesis of spherical-like ca(H2PO4)2•H2O nanoparticle by aqueous-methanol media(2013-08-30); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Facile synthesis of lead-free piezoelectric sodium niobate (NaNbO 3) Powders via the solution combustion method(2011-07-29); Nanocrystalline perovskite sodium niobate, NaNbO<inf>3</inf> (NN), was prepared by means of the glycine-nitrate combustion process (GNP). This was achieved by using sodium nitrate and niobium pentoxide as starting materials. The X-ray diffraction technique (XRD) was used to investigate the phase formation and purity of synthesized powder. The morphology of the powder obtained was characterized using a scanning electron microscope (SEM). The amount of glycine in the starting solution was found to have significant influence on the combustion process and the final phase purity. The fuel-rich ratio (fuel-to-oxidant molar ratio of 1.0) was found to produce NaNbO <inf>3</inf> powder of an average crystalline size (defined by XRD) of 31.31 ± 4.37 nm. Calcination at 400°C for 4 h produced single phase NN with an average crystalline size of about 26.60 to 37.14 nm. Copyright © Taylor &Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of Pb(Y1/2Nb1/2)O3 additions on thermal and electrical properties of PbZrO3 ceramics(2011-07-29); ; ; The solid solution of a (1-x)PbZrO<inf>3</inf> - xPb(Y<inf>1/2</inf>Nb <inf>1/2</inf>)O<inf>3</inf> (PZ - PYN) system, with x = 0.00 - 0.08, was synthesized by the wolframite precursor method. The effects of PYN content on crystal structure, and electrical and thermal properties of PbZrO<inf>3</inf> ceramic were investigated. The crystal structure of sintered ceramics was characterized by X-ray diffraction. The pure perovskite phase was obtained for all compositions. The transition temperatures of the AFE to PE phase become lower with PYN increase. The dielectric properties of PZ were improved by the addition of PYN. Copyright © Taylor & Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A new synthesis of BaHPO4 precipitated by BaCO3-H4PO4-NaOH system at room temperature(2013-08-30); ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Barium zirconate titanate nanoparticles synthesized by the sonochemical method(2013-05-01); ;