Materials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Characterization of Structural, Optical and Hydrophilicity properties of TiO2 Nano-Powder Synthesized by Sol-Gel Method169083410.30501/acp.2016.90834ENSamyarEsfandiariFaculty of Materials Science and Engineering, Islamic Azad University, Science & Research BranchHeydarHonarvar NazariFaculty of Environment and Energy, Science and Research Branch, Islamic Azad UniversiA.NematiMaterials Science and Engineering, Sharif University0000-0002-4842-2988MaryamKargar RaziFaculty of Chemistry, North Tehran Branch, Islamic Azad UniversitySaeidBaghshahiFaculty of Engineering and Technology, Imam Khomeini International University (IKIU)0000-0001-5504-9846Journal Article20150104<span>In this paper, titanium dioxide nano-particles were synthesized by sol-gel method in acidic atmosphere. The microstructure, morphology, optical band gap, and hydrophilicity of the sample were studied. Optical band gap of titanium dioxide was probed via Diffuse Reflectance Spectra (DRS) and contact angle (CA) was measured to investigate surface activity. XRD analysis was used to study crystallinity of the samples. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) was also performed. The results presented high crystallinity of particles with average particle size of ~21nm. Very small nano-particles were obtained (as small as 7nm). The obtained optical band gap of the sample was determined which was 3.35 eV with direct linear fitness in Tauc relation. Contact angle indicated super- hydrophilicity after 40 minutes under UV-Radiation. </span>https://www.acerp.ir/article_90834_335f12b9539419205d4671d856be9bd2.pdfMaterials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Investigation of Effective Parameters on Densification of ZrB2-SiC Based Composites Using Taguchi Method7159083510.30501/acp.2016.90835ENZohreBalakMaterials engineering, Azad UniversityMohammadZakeriResearch Department of Ceramic, Materials and Energy Research Center (MERC)0000-0001-5551-4912Mohammad RezaRahimipoorCeramic Division, MERC0000-0001-5840-0339EsmaeilSalahiCeramic Department, Materials and Energy Research Center (MERC)M.AziziehIslamic Azad UniversityH.KafashanDepartment of Materials Science and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, IranJournal Article20150116<span>Abstract The main goal of this study is optimization of densification of ZrB2-SiC composites reinforced with chopped Cf prepared by SPS. Taguchi method is employed as statistical design of experiment (DOE) to optimize densification parameters including SiC, Cf, MoSi2, HfB2 and ZrC content, milling time of Cf and SPS parameters such as temperature, time and pressure. Each of these factors was examined on four levels in order to obtain the optimum conditions. A total of 32 samples were prepared in accordance to the L32 array proposed by the Taguchi method. By using statistical analysis of variance (ANOVA), it has been concluded that the most significant effect on the densification is related to temperature, MoSi2 and time by 50.2%, 20.7% and 9.8% portion, respectively. Also, the results showed that pressure with 0.8%, ZrC with 1.9% and HfB2 with 1.9% have the least portion on open porosity. The other parameters including SiC, M.t and Cf have 2.9%, 3.6% and 3.8% on open porosity respectively.</span>https://www.acerp.ir/article_90835_ebb9a451961a45c69d22cbae34e9a281.pdfMaterials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Phlogopite glass-ceramic coatings on stainless steel substrate by plasma spray16217001910.30501/acp.2016.70019ENAidaFaeghiniaCeramic Division, Materials and Energy Research Center0000-0001-6288-7178NafisehShahgoliCeramic Department, Material and Energy Research C, Material and Energy Research Center(MERC)EbrahimJabbariCeramic Department, Material and Energy Research C, mercJournal ArticleMacor coatings on 316 alloys substrates were prepared by plasma spraying. The crystallization temperature, thermal expansion coefficient of mica glass-ceramic were at 900ºC and 40× 10−7/◦C respectively. The microhardness of obtained glass-ceramic coating was 6.8GPa and the coefficient friction was 0.98 . https://www.acerp.ir/article_70019_ed9487970298632234c8cac97d8d4cf5.pdfMaterials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Effect of Ni content on the reaction behaviors and microstructure of TiB2-TiC/Ni cermets synthesized by MASHS22267002010.30501/acp.2016.70020ENMehranShahbaziSemiconductors, MERCSeyed AliTayebifardSemiconductors, MERC0000-0003-3117-177XMansourRazaviCeramic Division, MERC0000-0003-0622-6775Journal ArticleIn this paper TiB2-TiC/Ni cermet with various Ni (20, 40 and 60 wt %) content were synthesized by mechanically activated self-propagating synthesis (MASHS) and effect of the addition of Ni on synthesis parameters and microstructure of synthesized samples were investigated. First raw materials (B4C, Ti and Ni) milled in Ar atmosphere. Then milling powders analyzed by XRD. In next step powders synthesized in tube furnace. After synthesis process all samples analyzed by XRD and SEM. Ignition time of samples was decreased with Ni content increased. SEM images shows with increases Ni content microstructure of samples has been fin and pore size has been decreased. The crystalline size of synthesized samples calculated with Williamson-Hall equation. Average crystalline size of samples with 60 wt % Nickel content was 15 and 8 nm for TiB2 and TiC respectively.https://www.acerp.ir/article_70020_15b7b2426a3fe3fa1ffd3725a2a5ce85.pdfMaterials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Investigation of Physical Properties of e-Beam Evaporated CdTe Thin Films for Photovoltaic Application27317002110.30501/acp.2016.70021ENMohammadEshraghiSemiconductors, Materials and Energy Research Center (MERC)NimaNaderiSemiconductors, Materials and Energy Research Center (MERC)0000-0002-4071-5516Journal ArticleCdTe thin films with 2.8 µm thickness were deposited by electron beam evaporation method. X-ray diffraction, scanning electron microscopy, UV-Vis-NIR spectroscopy and atomic force microscopy (AFM) were used to characterize the films. The results of AFM analysis revealed that the CdTe films have uniform surface. CdTe thin films were heat-treated by SnCl2 solution. Structural analysis using XRD showed that heat treatment by SnCl2 solution improves thin film crystallinity. Three-dimensional AFM images show that CdTe films have grown as nanocone arrays with maximum height of ~21 nm. The average roughness of the film surface on area of 2×2 µm2 is ~2.28 nm. The resultant films are closely packed and has smooth surface which is suitable for photovoltaic applications. A solar cell device was fabricated based on electron beam deposited poly-crystalline CdTe and CdS thin film as absorber and window layer on ITO coated soda lime glass as substrate. The electrical characteristics of CdS/CdTe thin film solar cells were investigated under illumination. From the current-voltage characteristics of fabricated device a typical rectifying photovoltaic behavior was obtained.https://www.acerp.ir/article_70021_41c807e86496cab1d8f36056d0541173.pdfMaterials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Effect of LiCl on the Microstructure and Luminescence Properties of YVO4:Eu3+ and YBO3:Eu3+ Phosphors32367002210.30501/acp.2016.70022ENSeyed MahdiRafiaeiMaterial Engineering, Golpayegan University of TechnologyJournal ArticleIn this investigation, Eu3+ doped YVO4 /YBO3 phosphors were synthesized individually by conventional solid state method at 1100 °C under atmosphere condition. Meanwhile, different amounts of LiClwere used as the flux compound to modify the morphology of the phosphor particles and also final luminescence properties. It was concluded that even small amounts of fluxes play a vital role in the growth of particles. The photoluminescence emission spectra of the phosphors were measured at λexc= 240 and 310 nm, respectively. It was found that using 2 wt% of flux compounds has a significant influence on the emission enhancement of YVO4:Eu3+ and YBO3:Eu3+ phosphors.https://www.acerp.ir/article_70022_574b48e848a1699c69034b975f4756bc.pdfMaterials and Energy Research Center (MERC)
Iranian Ceramic Society (ICERS)Advanced Ceramics Progress2423-74772220160601Influence of Calcination Kinetics Parameters on Synthesis of KNN Piezoelectric Ceramics37477002310.30501/acp.2016.70023ENNandiniNadarMechanical Engineering, R V College of EngineeringMunishamaiahKrishnaDept of Mechanical Engg, R V College of EngineeringJournal ArticleThe current research was focused on synthesizing potassium sodium niobate (KNN) piezoelectric ceramics for the system (K0.48Na0.52) NbO3 by high energy ball milling process for 15h at the speed of 300 rpm. The blended nano-crystalline powder was calcined in conventional box furnace at 700oC, 800oC and 900oC for duration of 5h, 7h and 10h. Diffraction result of calcine powder confirmed the formation of pure perovskite structure at 900°C, 7h along with the phase transformation from orthorhombic to tetragonal crystal structure but resulted in the formation of secondary phases at 900°C, 10h. Fourier Transmittance analysis was carried out for 700°C, 800°C and 900°C to obtain the adsorption or emission of KNN nano powders and identified the stable crystal structure at 900°C, 7h. Hence optimized calcination parameters were 900°C, 7h. The study of mass loss before and after calcination identified the decomposition of the carbon atoms into bicarbonates and completion of the chemical reaction. The study confirmed that calcination kinetics were time and temperature dependent. Morphology of the calcined powders revealed cubical structure with good compactness for 900oC of 7h calcination with the grain size in the range of 65nm-120nm.https://www.acerp.ir/article_70023_3a03f453d8819ef02244b8dde1a768bf.pdf