NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020最新文献_第8页

Optical bandgap and width of Urbach tail of lithium doped zinc oxide films deposited by SILAR method SILAR法制备掺杂锂氧化锌薄膜的光学带隙和乌尔巴赫尾宽度

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0061016

Rakhesh Vamadevan, Vaisakh Rajendra Kumar, Jerry Saji

{"title":"Optical bandgap and width of Urbach tail of lithium doped zinc oxide films deposited by SILAR method","authors":"Rakhesh Vamadevan, Vaisakh Rajendra Kumar, Jerry Saji","doi":"10.1063/5.0061016","DOIUrl":"https://doi.org/10.1063/5.0061016","url":null,"abstract":"Undoped and Lithium (Li) doped Zinc Oxide (ZnO)films were prepared by Successive Ionic Layer Adsorption and Reaction (SILAR) technique using 0.1M Zinc Sulphate with Ammonia as the cationic solution. Doping is done at different atomic weight percentage (atm. wt%) 5, 10 and 15 by adding Lithium Chloride to the cationic solution. The samples were annealed at 500◦C for one hour after deposition. The UV-Visible Transmittance and Absorbance of the samples were recorded from 250nm to 900nm.The reflectance data of the samples were estimated and the plot of reflectance suggested that the quality of the films is good except for Li:ZnO film at 5atm.wt%.The Optical constants ’n’ and ’k’ were calculated for different incident wavelengths on the samples. The variation of optical constants with incident wavelengths suggested that the Li: ZnO sample at 5atm.wt% has relatively high values when compared to other samples. The Urbach energy (Ee) or width of band tail is calculated from the (lnα-hν) plot and the Optical bandgap energy of the samples were calculated fron the (αhν)2 − hν plot. The bandgap energy was observed to be high for the undoped samples and decreases to normal value for 5atm.wt% sample. The bandgap energy again increases with doping concentration. The Urbach energy is found to be increasing with increase in doping concentration. These variations could be explained using the amorphous-crystalline nature and defect related effects in the samples due to doping.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73106929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First-principle calculations of the electronic structure of intrinsic defects and impurities of alkali metals in SiS2 SiS2中碱金属本征缺陷和杂质电子结构的第一性原理计算

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0060906

D. Bletskan, V. Vakulchak, A. Malets

引用次数: 0

Strengthening of ferromagnetic intrachain coupling by Ge substitution in quasi-one-dimensional spin chain compound: Ca3Co2O6 准一维自旋链化合物Ca3Co2O6中Ge取代强化铁磁链内耦合

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0061949

S. De, A. Banerjee

引用次数: 0

Pencil graphite as a counter electrode for applications in DSSCs 铅笔石墨对电极在DSSCs中的应用

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0060826

Deeksha Kharkwal, N. Sharma, S. Gupta, C. Negi

引用次数: 4

Ab initio study of three-fold methyl torsion in 2-methyl-3-hydroxypyridine in ground electronic state (S0) 2-甲基-3-羟基吡啶基电子态(S0)中三次甲基扭转的从头算研究

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0061173

A. Srivastava, S. Saxena

引用次数: 2

A variational theory of zero field electronic specific heat of Anderson lattice model: An application to colossal magnetoresistive manganites (Re1-xAxMnO3) 安德森晶格模型零场电子比热的变分理论:在巨磁阻锰矿(Re1-xAxMnO3)中的应用

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0060890

S. Panwar, I. Singh

{"title":"A variational theory of zero field electronic specific heat of Anderson lattice model: An application to colossal magnetoresistive manganites (Re1-xAxMnO3)","authors":"S. Panwar, I. Singh","doi":"10.1063/5.0060890","DOIUrl":"https://doi.org/10.1063/5.0060890","url":null,"abstract":"Using a simple variational method, we have studied the zero field electronic specific heat (Cv) as a function of temperature of Anderson lattice model used for rare earth manganites doped with alkaline earths namely ( where Re=La, Pr, Nd etc., and A= Ca, Sr, Ba etc.) which exhibit colossal magnetoresistance (CMR), metalinsulator transition & many other poorly understood phenomena . We have already used this variational method to study the zero field electronic & magnetic properties like electrical resistivity & magnetic susceptibility of doped CMR manganites. We have taken two band (l-b) Anderson lattice model Hamiltonian for manganites in the strong electronlattice JahnTeller (JT) coupling regime to study the temperature dependence of C vin these compounds. We have also observed the role of the model parameters e.g. local Coulomb repulsionU, strong ferromagnetic Hund’s Rule coupling JH between eg& t2g spins & hybridization Vk between l– polarons& d electrons of the same spins on Cv&linear coefficient Cv/ T. We find from our results that as the temperature is lowered below a critical temperature Tc (˷100 K), there is an anomaly (sharp peak) in both Cv(T) &Cv/T beyond which it falls off for particular values of JH, V & doping values x resembling with the key feature of many CMR compounds La0.815 Sr0.185 MnO3 & Pr0.6-xBixSr0.4MnO3(x= 0.00.15). The observed low temperature peak in Cv(T) becomes progressively broader & shifts to higher temperature region on increasing Vk or JH or doping x value. The specific heat anomaly near Tc ˷ 100 K is related to magnetic ordering due to the paramagneticferromagnetic transitions and magnetic inhomogeneity in these manganites.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81342002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of lubrication performance and flow behavior of nano-fluids 纳米流体的润滑性能与流动特性研究

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0061463

P. Thapliyal, Ajay Kumar, G. D. Thakre

{"title":"Investigation of lubrication performance and flow behavior of nano-fluids","authors":"P. Thapliyal, Ajay Kumar, G. D. Thakre","doi":"10.1063/5.0061463","DOIUrl":"https://doi.org/10.1063/5.0061463","url":null,"abstract":"Tribo-performance behavior of lubricants plays an instrumental role in conserving the energy while enhancing the machine life. Rheological properties of lubricants such as shear stress, shear rate, viscosity, viscoelastic behavior etc influence the tribo-performance behavior to a great extent. Modern Chemistry lays emphasis on the synthesis of nano additives that help enhance the rheological and tribological properties of lubricants ultimately leading to the conservation of valuable energy. In the present study the Rheological and Tribological performance behavior of hexagonal boron nitride (Hex-BN) nanofluids is presented. In order to study the effect of Hex-BN nano-particles on the rheological properties of lubricants two commercially available blended synthetic engine oils of same grades were selected. They were blended with 0.1 and 0.2% weight by weight of well dispersed Hex-BNnanoparticles. Standard test procedures were used to determine physicochemical properties and tribo-performance behavior of oils respectively. The study reveals that tested Hex-BN nanofluids behaved as non-Newtonian lubricants with shear thinning behavior at all tested temperatures and exhibited viscoelastic behavior at small shear rates. As a result of this anti-wear property showed an enhancement up to 12% for 0.2% Hex-BN indicating fair improvement in anti-wear properties of Hex-BN nanofluid. However, a marginal reduction in friction to the tune of 7% observed for the 0.2 wt% of Hex-BN nano-particles in the tested lubricants indicates that finished products have little scope to improve anti-friction properties under the influence of existing additives.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81559382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and luminescence of Li3ScCl6:Ce Li3ScCl6:Ce的合成与发光

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0060843

R. A. Bhoyar, A. Nayak, P. K. Tawalare, S. Wankhede, S. Moharil

引用次数: 0

The electronic and optical properties of CH3CH2NH3PbI3: A first principles study CH3CH2NH3PbI3的电子和光学性质:第一性原理研究

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0061539

T. Joshi, Giriraj Sharma, A. Verma, S. Gupta

引用次数: 0

Highly transparent graphene oxide composited TiO2 thin film as efficient photoanode for dye-sensitized solar cells 高透明氧化石墨烯复合TiO2薄膜作为染料敏化太阳能电池的高效光阳极

NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020 Pub Date : 2021-01-01 DOI: 10.1063/5.0060892

Mrinmoy Chakraborty, Rounak Banerjee, R. Gayen

{"title":"Highly transparent graphene oxide composited TiO2 thin film as efficient photoanode for dye-sensitized solar cells","authors":"Mrinmoy Chakraborty, Rounak Banerjee, R. Gayen","doi":"10.1063/5.0060892","DOIUrl":"https://doi.org/10.1063/5.0060892","url":null,"abstract":"Here we report the fabrication of highly transparent graphene oxide (GO) reinforced TiO2 nanocomposite thin film and demonstrate that it enhances the power conversion efficiency of dye-sensitized solar cells (DSSC) when used as photoanode. TiO2-GO nanocomposite thin films with varying GO concentrations are deposited on top of the fluorine doped tin oxide (FTO) coated glass substrate by easy, cost-effective sol-gel spin coating technique. Microstructural and optical characterizations confirm the formation of highly transparent, uniform nanocomposite thin films comprised of rutile phase of TiO2 nanoparticles. The estimated optical band gap of pristine TiO2 is ~ 3.34 eV which decreased slightly with GO concentrations. The nanocomposite films are used as photoanode of a basic DSSC structure which has been fabricated using commercially available N3 dye as photosensitizers, conventional iodine solution (I-/I3+) as electrolyte and FTOcoated glass as counter electrode. The current-voltage characteristics of DSSC measured under illumination of 1 SUN AM1.5 solar spectrum show significant enhancement of short circuit current density (Jsc) and power conversion efficiency (η) with GO concentration in TiO2 photoanode which is attributed to the less recombination of photogenerated charge carriers and better transport facilitated by conduction GO network.","PeriodicalId":18837,"journal":{"name":"NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86771286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1