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Zinc Chloride Modified Electronic Transport and Relaxation Studies in Barium-Tellurite Glasses
Sunil Dhankhar,R. S. Kundu,Sunita Rani,Preeti Sharma,S. Murugavel,Rajesh Punia,N. Kishore 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.5
The ac conductivity of halide based tellurium glasses havingcomposition 70 TeO2-(30-x) BaO-x ZnCl2 ; x = 5, 10, 15 , 20 and 25has been investigated in the frequency range 10-1 Hz to 105Hz and inthe temperature range 453 K to 553 K. The frequency and temperaturedependent ac conductivity show mixed behaviour with increase inhalide content and found to obey Jonscher’s universal power law. Thevalues of dc conductivity, crossover frequency and frequency exponenthave been estimated from the fitting of experimental data of acconductivity with Jonscher’s universal power law. For determining theconduction mechanism in studied glass system, frequency exponent hasbeen analyzed by various theoretical models. In presently studiedglasses, the ac conduction takes place via overlapping large polarontunneling (OLPT). The values of activation energy for dc conduction(W) and the one associated with relaxation process (ER) are found toincrease with increase in x up to glass sample with x = 15 and thereafterit decrease with increase in zinc chloride content. DC conduction takes place via variable range hopping (VRH) as proposed byMott with some modification suggested by Punia et al. The value of real part of modulus (M') is observed to decrease withincrease in temperature. The value of stretched exponent (β) obtained from fitting of M'' reveals the presence of non-Debye typeof relaxation in presently studied glass samples. Scaling spectra of ac conductivity and values of electric modulus (M' and M'')collapse into a single master curve for all the compositions and temperatures. The values of relaxation energy (ER) for all thestudied glass compositions are almost equal to W, suggesting that polarons have to overcome same barrier while relaxing andconducting. The conduction and relaxation processes in the studied glass samples are composition and temperature independent.
수소개질형 연료전지용 마이크로 개질기의 제작 및 성능분석
이홍렬(H. R. Lee),길재형(J. H. Gil),김성한(S. H. Kim),하지원(J. W. Ha),장재혁(J. H. Jang),Arunabha Kundu 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
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P. Nayek,S. Ghosh,S. Kundu,T. Pal Majumder,S.K. Roy,N. Bennis,J.M. Otón,R. Dabrowski 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The electro-optical behavior of the orthoconic antiferroelectric liquid crystal mixture W-182 has been studied. Surface-stabilized, low thickness cells of this mixture give a perfect double hysteresis loop with 1 Hz triangular signal, reaching different transmission levels for different voltages amplitudes. These levels can be stabilized with a single holding voltage, making it possible for the material to be passively multiplexed at video rate. With the application of bias field at three different temperatures, we have observed the field-induced Fréedericksz transition from SmI*A–SmC*A, antiferroelectric to ferroelectric, and ferroelectric to paraelectric transition. Such Fréedericksz transition point is decreased with the increase of temperature.
Yoo, J.M.,Lee, Y.R.,Kim, D.,Jeong, M.J.,Stockwell, W.R.,Kundu, P.K.,Oh, S.M.,Shin, D.B.,Lee, S.J. Pergamon Press ; Elsevier [distribution] 2014 Atmospheric environment Vol.82 No.-
The washout effect of summertime rain on surface air pollutants (O<SUB>3</SUB>, CO, NO<SUB>2</SUB>, SO<SUB>2</SUB>, and PM<SUB>10</SUB>) has been investigated over South Korea during 2002-2012 using routinely available air-monitored and meteorological data. Three new washout indices for PM<SUB>10</SUB>, SO<SUB>2</SUB>, NO<SUB>2</SUB>, and CO are developed to express the effect of precipitation scavenging on these pollutants. All of these pollutants show statistically significant negative correlations between their concentrations and rain intensity due to washout or convection. The washout effect is estimated for precipitation episodes classified by rain intensity (one set included all episodes and another included a subset of moderate intensity episodes that exclude Changma and typhoons), based on the log-transformed hourly data. The most sensitive air pollutant to the rain onset among these five air pollutants is PM<SUB>10</SUB>. The relative effect of the rainfall washout on the air pollutant concentrations is estimated to be: PM<SUB>10</SUB> > SO<SUB>2</SUB> > NO<SUB>2</SUB> > CO > O<SUB>3</SUB>, indicating that PM<SUB>10</SUB> is most effectively scavenged by rainfall. The analysis suggests that the O<SUB>3</SUB> concentrations may increase due to vertical mixing leading to its downward transport from the lower stratosphere/upper troposphere. The concentrations of CO are reduced, probably due to both the washout and convection. The concentrations of NO<SUB>2</SUB> are affected by the opposing influences of lightning-generation and washout and this are discussed as well.