In the present work, thin films of Cr/NiO/Ni are deposited on glass substrates using RF magnetron sputteringtechnique. The uniformity and homogeneity of the prepared films were controlled by varying the power of the source, the target-substrate distance and the pressure of the plasma gas which is argon. In order to test the Preisach Model, we carried outmeasurements according to two directions: parallel and perpendicular to the substrate plane using a Vibrating SampleMagnetometer at room temperature. Good agreement has been obtained by comparing the experimental hysteresis loops to theones determined using Preisach model. We conclude that this model is powerful in predicting the magnetic properties ofmultilayer systems. # Cr/NiO/Ni #MAGNETRON_SPUTTERING #PREISACH MODEL #MAGNETIC_HYSTERESIS
{"title":"Modeling of magnetic properties (Cr/NiO/Ni) based multi-layers deposited by magnetron sputtering using Preisach model","authors":"A. Bendjerad","doi":"10.23647/ca.md20170310","DOIUrl":"https://doi.org/10.23647/ca.md20170310","url":null,"abstract":"In the present work, thin films of Cr/NiO/Ni are deposited on glass substrates using RF magnetron sputteringtechnique. The uniformity and homogeneity of the prepared films were controlled by varying the power of the source, the target-substrate distance and the pressure of the plasma gas which is argon. In order to test the Preisach Model, we carried outmeasurements according to two directions: parallel and perpendicular to the substrate plane using a Vibrating SampleMagnetometer at room temperature. Good agreement has been obtained by comparing the experimental hysteresis loops to theones determined using Preisach model. We conclude that this model is powerful in predicting the magnetic properties ofmultilayer systems. # Cr/NiO/Ni #MAGNETRON_SPUTTERING #PREISACH MODEL #MAGNETIC_HYSTERESIS","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84135060","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}
A. Collado, G. Hernandez, V. Morejon, F. Coll, C. Peniche
DI-31 is a synthetic analog of brasinosteroids (ABR), the active ingredient (PA) of Biobras, a plantgrowth stimulant, which has shown positive impact on Cuban agriculture, especially in rice cultivation. However, ithas the drawback of having low solubility in water and being rapidly metabolized by the plants. An alternative toovercome these limitations is its micro-encapsulation in a polymer matrix. Chitosan (CHI) has been investigatedas an excellent candidate for microencapsulation of DI-31. Chitosan (CHI) is a natural polysaccharide obtainedfrom chitin extracted from exoesqueleton of crustaceans, which increases resistance of the plants to the attack ofpests and promotes the yield of the crops, also possesses excellent biocompatibility, biodegradability andmucoadhesivity, also inducing the defense of the plants against the attack of different pathogens. # polymer_matrix #chitosan #microparticles #spray_drying #DI-31
{"title":"Encapsulation of a bioactive steroid in apolymer matrix","authors":"A. Collado, G. Hernandez, V. Morejon, F. Coll, C. Peniche","doi":"10.23647/ca.md20171505","DOIUrl":"https://doi.org/10.23647/ca.md20171505","url":null,"abstract":"DI-31 is a synthetic analog of brasinosteroids (ABR), the active ingredient (PA) of Biobras, a plantgrowth stimulant, which has shown positive impact on Cuban agriculture, especially in rice cultivation. However, ithas the drawback of having low solubility in water and being rapidly metabolized by the plants. An alternative toovercome these limitations is its micro-encapsulation in a polymer matrix. Chitosan (CHI) has been investigatedas an excellent candidate for microencapsulation of DI-31. Chitosan (CHI) is a natural polysaccharide obtainedfrom chitin extracted from exoesqueleton of crustaceans, which increases resistance of the plants to the attack ofpests and promotes the yield of the crops, also possesses excellent biocompatibility, biodegradability andmucoadhesivity, also inducing the defense of the plants against the attack of different pathogens. # polymer_matrix #chitosan #microparticles #spray_drying #DI-31","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73411682","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}
The main ferroelectric materials are lead-based which cause serious environmental problem. Then, to develop environment friendly materials, lead-free ceramics derived from BaTiO3 were found to be interesting owing to their attractive ferroelectric performances. Moreover, the ferroelectric materials present interesting characteristics suitable for photoelectrochemical applications. In this perspective, ferroelectric and photoelectrochemical properties of Ba0.785Bi0.127Y0.017TiO3 (BBiYT), Ba0.975Eu0.017(Ti0.75Zr0.25)O3 (BETZ) and Ba(Ti0.96Mg0.013Nb0.026)O3 (BTMN) compositions are presented and discussed. The relative permittivity and losses are determined under dry helium as a function of both temperature(77-450 K) and frequency (102-2.105 Hz). BTMN compositions are characterized by a normal ferroelectric behaviour, while BBiYT and BETZ present relaxor ferroelectric properties. All these compounds present photoelectrochemical properties with different applications: eosin oxidation under solar light (BTMN), chromate reduction (BETZ) after 6 h of exposition to sunlight and H2 production upon visible light (BBiYT).
{"title":"Some lead-free ceramics of ferroelectric andphotoelectrochemical applications","authors":"K. Taïbi","doi":"10.23647/ca.md20171501","DOIUrl":"https://doi.org/10.23647/ca.md20171501","url":null,"abstract":"The main ferroelectric materials are lead-based which cause serious environmental problem. Then, to develop environment friendly materials, lead-free ceramics derived from BaTiO3 were found to be interesting owing to their attractive ferroelectric performances. Moreover, the ferroelectric materials present interesting characteristics suitable for photoelectrochemical applications. In this perspective, ferroelectric and photoelectrochemical properties of Ba0.785Bi0.127Y0.017TiO3 (BBiYT), Ba0.975Eu0.017(Ti0.75Zr0.25)O3 (BETZ) and Ba(Ti0.96Mg0.013Nb0.026)O3 (BTMN) compositions are presented and discussed. The relative permittivity and losses are determined under dry helium as a function of both temperature(77-450 K) and frequency (102-2.105 Hz). BTMN compositions are characterized by a normal ferroelectric behaviour, while BBiYT and BETZ present relaxor ferroelectric properties. All these compounds present photoelectrochemical properties with different applications: eosin oxidation under solar light (BTMN), chromate reduction (BETZ) after 6 h of exposition to sunlight and H2 production upon visible light (BBiYT).","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81024314","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}
By pulsed laser deposition, lead potassium niobate Pb2KNb5O15 was grown on (001) oriented Gd3Ga5O12 substrate using a platinum buffer layer. The PKN thin films were characterized by X-Ray diffraction and Scanning Electron Microscopy (SEM). The dependence of their structural properties as a function of the deposition parameters was studied. It has been found that the out of plane orientation of PKN film depends on the oxygen pressure used during the growth. Indeed, PKN thin film is oriented [001] for low pressure and is oriented [530] for high pressure. For these two orientations, the crystalline quality of PKN film was determined using omega scans.
{"title":"Lead potassium niobate thin films grown by Pulsed Laser Deposition","authors":"B. Allouche, Y. Gagou, M. El Marssi","doi":"10.23647/ca.md20171401","DOIUrl":"https://doi.org/10.23647/ca.md20171401","url":null,"abstract":"By pulsed laser deposition, lead potassium niobate Pb2KNb5O15 was grown on (001) oriented Gd3Ga5O12 substrate using a platinum buffer layer. The PKN thin films were characterized by X-Ray diffraction and Scanning Electron Microscopy (SEM). The dependence of their structural properties as a function of the deposition parameters was studied. It has been found that the out of plane orientation of PKN film depends on the oxygen pressure used during the growth. Indeed, PKN thin film is oriented [001] for low pressure and is oriented [530] for high pressure. For these two orientations, the crystalline quality of PKN film was determined using omega scans.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73636482","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}
S. A. Dargham, F. Ponchel, M. Soueidan, A. Khoury, J. Assaad, D. Remiens, D. Zaouk
The objective of this work is to synthesize lead-free piezoelectric thin films by the Sol-Gel method:bismuth sodium titanate (Bi0.5Na0.5TiO3 or BNT).BNT films were annealed with the rapid thermal process (RTP).The film treated at 700°C is dense and well crystallized in the perovskite phase. The first results of electricalcharacterizations showed promising dielectric, ferroelectric and piezoelectric performance. At 12 kHz, thedielectric constant and losses are 430 and 0.07, respectively. Ferroelectric hysteresis measurements indicated aremanent polarization of 10μC/cm2, associated with a coercive field of 70 kV/cm. The piezoelectric properties ofBNT films were studied with a laser Doppler interferometer: a piezoelectric coefficient (d33effmax) of 42 pm/V was measured.
{"title":"LEAD-FREE BNT PIEZOELECTRIC THIN FILMS BY SOL-GEL METHOD.","authors":"S. A. Dargham, F. Ponchel, M. Soueidan, A. Khoury, J. Assaad, D. Remiens, D. Zaouk","doi":"10.23647/ca.md20161217","DOIUrl":"https://doi.org/10.23647/ca.md20161217","url":null,"abstract":"The objective of this work is to synthesize lead-free piezoelectric thin films by the Sol-Gel method:bismuth sodium titanate (Bi0.5Na0.5TiO3 or BNT).BNT films were annealed with the rapid thermal process (RTP).The film treated at 700°C is dense and well crystallized in the perovskite phase. The first results of electricalcharacterizations showed promising dielectric, ferroelectric and piezoelectric performance. At 12 kHz, thedielectric constant and losses are 430 and 0.07, respectively. Ferroelectric hysteresis measurements indicated aremanent polarization of 10μC/cm2, associated with a coercive field of 70 kV/cm. The piezoelectric properties ofBNT films were studied with a laser Doppler interferometer: a piezoelectric coefficient (d33effmax) of 42 pm/V was measured.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72830794","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}
Various memory technologies have emerged throughout history. Today, the discovery of new technologies and new materials over the past two decades has helped to manufacture memory devices, less bulky, less expensive, consuming less energy, but always with a larger capacity and higher speed data transfer. The international symposium ISPDS-1 has gathered researchers working on various aspects related with the problem of data storage, as Ferroics and Multiferroics, Memory storage devices, Switching phenomena, Heterojunctions and semiconductors, Energy and environment, and miscellaneous aspects. These proceedings gather abstracts of recent works in the field, presented at the symposium, dealing with chemistry, materials, devices, crystal structure, phase_diagrams, perovskite, Aurivillius, ferroelectric, ferrielectric, nanowire, Multiferroic, Flexoelectric, Magnetoelectric, Piezoresponse, Electrocaloric effect, photoelectrochemical, Resistive Switching, Magnetoelectric, nanoparticle, photovoltaic, Data_Storage, Pulsed_Laser_Deposition, PLD, lead_free_ferroelectric, solar cell, Lead_free_Materials, Nanodots, Memory, Storage, Polar nanoregions, ferroelectric_paraelectric_superlattices, ceramic, thin film, TTB, Dielectric properties, phase transition, Pb(Zn1/3Nb2/3)O3, GaFeO3, BaFe12O19, TbMnO3, PbTiO3, (Na1/2Bi1/2)TiO3, BaTiO3_BaZrO3_superlattices, Bi0.5Na0.5TiO3, Cu2S, paracetamol, ZnO, BiFeO3, ZnO thin film, Graphene, ZnO_Nanorod, mesoporous_TiO2, silicate glass, C60, C70,carbon peapods, Nematic Phase, TbMnO3, BaHfO3, Pb2KNb5O15, LiNbO3, Dielectric_measurement, impedance_spectroscopy, BaGexTi1-xO3_ceramics, SrBaBi2Nb2TiO12, PolySi-oxide, AlN, Magnetron_sputtering, photonic, polyvinylidene_fluoride_ultrathin_film, Phosphate, dechiralization_line, Nb3Al, K3Sr2LnNb10O30 (Ln = La, Gd), NaXF3, DFT, Electronic_structure, Optical properties, CsBeF3, Single-Wall_Boron_nitride_nanotubes, energy_storage, capacitors, Bi2O3
{"title":"Proceedings of the 1st International symposium on physics of data storage","authors":"","doi":"10.23647/ca.md20161108","DOIUrl":"https://doi.org/10.23647/ca.md20161108","url":null,"abstract":"Various memory technologies have emerged throughout history. Today, the discovery of new technologies and new materials over the past two decades has helped to manufacture memory devices, less bulky, less expensive, consuming less energy, but always with a larger capacity and higher speed data transfer. The international symposium ISPDS-1 has gathered researchers working on various aspects related with the problem of data storage, as Ferroics and Multiferroics, Memory storage devices, Switching phenomena, Heterojunctions and semiconductors, Energy and environment, and miscellaneous aspects. These proceedings gather abstracts of recent works in the field, presented at the symposium, dealing with chemistry, materials, devices, crystal structure, phase_diagrams, perovskite, Aurivillius, ferroelectric, ferrielectric, nanowire, Multiferroic, Flexoelectric, Magnetoelectric, Piezoresponse, Electrocaloric effect, photoelectrochemical, Resistive Switching, Magnetoelectric, nanoparticle, photovoltaic, Data_Storage, Pulsed_Laser_Deposition, PLD, lead_free_ferroelectric, solar cell, Lead_free_Materials, Nanodots, Memory, Storage, Polar nanoregions, ferroelectric_paraelectric_superlattices, ceramic, thin film, TTB, Dielectric properties, phase transition, Pb(Zn1/3Nb2/3)O3, GaFeO3, BaFe12O19, TbMnO3, PbTiO3, (Na1/2Bi1/2)TiO3, BaTiO3_BaZrO3_superlattices, Bi0.5Na0.5TiO3, Cu2S, paracetamol, ZnO, BiFeO3, ZnO thin film, Graphene, ZnO_Nanorod, mesoporous_TiO2, silicate glass, C60, C70,carbon peapods, Nematic Phase, TbMnO3, BaHfO3, Pb2KNb5O15, LiNbO3, Dielectric_measurement, impedance_spectroscopy, BaGexTi1-xO3_ceramics, SrBaBi2Nb2TiO12, PolySi-oxide, AlN, Magnetron_sputtering, photonic, polyvinylidene_fluoride_ultrathin_film, Phosphate, dechiralization_line, Nb3Al, K3Sr2LnNb10O30 (Ln = La, Gd), NaXF3, DFT, Electronic_structure, Optical properties, CsBeF3, Single-Wall_Boron_nitride_nanotubes, energy_storage, capacitors, Bi2O3","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88678636","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}
H. Chadli, F. Fergani, S. Abdelkader, A. Rahmani, B. Fakrach
We use the spectral moments method in the framework of the bond-polarization theory to calculate nonresonant Raman spectra of C60 peapods as a function of the concentration of fullerenes inside the single wall carbon nanotubes. The evolution of the average Raman intensity ratios between Raman mode of C60 molecules and nanotube as a function of the concentration of fullerenes has been analyzed and a general good agreement is found between calculations and measurements. #CARBON_NANOTUBES #PEAPODS #RAMAN_SPECTROSCOPY #SIMULATION #SPECTRAL_MOMENT_METHOD
{"title":"Filling rate dependence on theoretical Raman spectra of carbon C60 peapods","authors":"H. Chadli, F. Fergani, S. Abdelkader, A. Rahmani, B. Fakrach","doi":"10.23647/CA.MD20161221","DOIUrl":"https://doi.org/10.23647/CA.MD20161221","url":null,"abstract":"We use the spectral moments method in the framework of the bond-polarization theory to calculate nonresonant Raman spectra of C60 peapods as a function of the concentration of fullerenes inside the single wall carbon nanotubes. The evolution of the average Raman intensity ratios between Raman mode of C60 molecules and nanotube as a function of the concentration of fullerenes has been analyzed and a general good agreement is found between calculations and measurements. #CARBON_NANOTUBES #PEAPODS #RAMAN_SPECTROSCOPY #SIMULATION #SPECTRAL_MOMENT_METHOD","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81449775","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}
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