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Phase transformation of the brownmillerite SrCoO2.5 thin film through alkaline water electrolysis
Tambunan, Octolia Togibasa,Lee, Min Young,Kim, Deok Hyeon,Parwanta, Kadek Juliana,Jung, Chang Uk Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.12
A phase transformation from insulating brownmillerite SrCoO2.5 to conducting perovskite SrCoO3 through electrochemical oxidation has been demonstrated for thin films of SrCoOx on a SrTiO3 (001) substrate. The cobalt-oxide film strongly favors the brownmillerite phase of SrCoO2.5 instead of the perovskite phase of SrCoO3 on a SrTiO3 (001) substrate due to its low lattice mismatch. Therefore, the phase transformation has its own retention. The alkaline water electrolysis occurs between the copper cathode and the SrCoO2.5 film anode. The H+ ions are attracted to the cathode and generate H-2 gas. The OH- ions are attracted to the film's surface and generate a rich amount of oxygen to fill the oxygen vacancy channel of brownmillerite SrCoO2.5. The phase transformation was verified from the change in the out-of-plane lattice constant and the change in the resistivity of the electrolyzed film.
Resistance switching in epitaxial SrCoO<sub><i>x</i></sub> thin films
Tambunan, Octolia T.,Parwanta, Kadek J.,Acharya, Susant K.,Lee, Bo Wha,Jung, Chang Uk,Kim, Yeon Soo,Park, Bae Ho,Jeong, Huiseong,Park, Ji-Yong,Cho, Myung Rae,Park, Yun Daniel,Choi, Woo Seok,Kim, Dong- American Institute of Physics 2014 Applied Physics Letters Vol.105 No.6
The Assessment of the Importance of Agricultural Growth for Poverty Reduction in Indonesia
Tulus Tambunan 서울대학교 경제연구소 2009 Seoul journal of economics Vol.22 No.3
Although poverty is generally recognized as a highly multidimensional phenomenon, in the Indonesian context, poverty has been mainly an agricultural or a rural phenomenon. This has of course an important policy implication for poverty reduction in Indonesia. This paper examines the importance of agricultural growth for poverty reduction in Indonesia. It shows that: (i) agriculture is still the biggest employment-generating sector; (ii) the vast majority of poor families are in agriculture, consisting mainly of the marginal farmers and agricultural laborers; (iii) poverty in agriculture is caused by many factors, including lack or unequal distribution of land, and lack of capital; (iv) growth in gross domestic product (GDP) has an impact on poverty reduction; and (v) the decomposition of changes in poverty by sector shows that the output growth in agriculture appears to have the greater effect on the change in poverty than that in manufacturing, though it is lower than that in services.
Interference Effect in Multinozzle EHD Inkjet Printing
Indra Hartarto Tambunan,Si Bui Quang Tran,Doyoung Byun(변도영) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Interference effect is a critical issue in multinozzle inkjet printing since it is a common effect that happened in many cases. This paper describes interference effect in multinozzle electrohydrodinamics (EHD) inkjet printing which applied with superimposed high DC voltage. We observed the interference effect between two nozzles configuration. And we investigated the effects of distance between the nozzle and the electrode and the frequency. Superimposed pulse signal onto the bias dc voltage is controlled by a PCB board that we designed and fabricated, and we studied the effects of the frequency, duty cycle, and the pulse amplitude.
Thermoelectric properties of polycrystalline tetragonal SrCu2O2
Octolia Togibasa Tambunan,김재영,김일호,정창욱,유춘리,이보화 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
In this study, we report the successful fabrication of polycrystalline tetragonal SrCu2O2 by a solid state reaction and the dependence of its thermoelectric properties on the sintering temperature. Two sintering temperatures, 1093 K and 1143 K,were used in the solid state reaction process. A p-type semiconducting behavior was observed for both samples. In the temperature range of 423 to 923 K, the SrCu2O2 sintered at 1093 K shows a relatively higher conductivity, power factor, and figure of merit as compared to the SrCu2O2 sintered at 1143 K. At 923 K, the Seebeck coefficient and the power factor for the SrCu2O2 sintered at 1093 K are 298 mV/K and 2 × 10−6 W/mK2, respectively. These values are comparable to the thermoelectric performance of polycrystalline p-type CuAlO2, suggesting that polycrystalline SrCu2O2 prepared with optimized conditions could be used for thermoelectric applications.
Effect of Ca doping on the thermoelectric properties of SrCu2O2
Octolia Togibasa Tambunan,김일호,이보화,유춘리 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.3
The thermoelectric properties of p-type oxide SrCu2O2 doped with Ca with amounts of 0, 3, 10, and 15% have been studied. The Seebeck coefficients were found to be positive for all the samples in the temperature range between 423 and 923 K. Although no effective enhancement of the electrical conductivity was observed, doping with Ca clearly improved the Seebeck coefficients and the thermal conductivity of SrCu2O2. SrCu2O2 doped with 10% Ca showed the lowest thermal conductivity that varied from 0.32 W/mK at 423 K to 0.66 W/mK at 923 K. Overall, the value of ZT of Ca-doped SrCu2O2 was slightly larger than that of the un-doped SrCu2O2. SrCu2O2 doped with 15% of Ca showed the highest ZT of 2.67×10-3 at 423 K and 4.38×10-3 at 923 K. The thermoelectric properties of p-type oxide SrCu2O2 doped with Ca with amounts of 0, 3, 10, and 15% have been studied. The Seebeck coefficients were found to be positive for all the samples in the temperature range between 423 and 923 K. Although no effective enhancement of the electrical conductivity was observed, doping with Ca clearly improved the Seebeck coefficients and the thermal conductivity of SrCu2O2. SrCu2O2 doped with 10% Ca showed the lowest thermal conductivity that varied from 0.32 W/mK at 423 K to 0.66 W/mK at 923 K. Overall, the value of ZT of Ca-doped SrCu2O2 was slightly larger than that of the un-doped SrCu2O2. SrCu2O2 doped with 15% of Ca showed the highest ZT of 2.67×10-3 at 423 K and 4.38×10-3 at 923 K.