Sintering Temperatures Investigation on the Electrical Characteristics of Fe2TiO5/MnO2 Ceramics-Based NTC Thermistor

2018 ◽  
Vol 917 ◽  
pp. 74-77
Author(s):  
Wiendartun ◽  
Dadi Rusdiana ◽  
Andhy Setiawan
Keyword(s):  
Electrical Characteristic ◽  
Electrical Characteristics ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Xrd Pattern ◽  
X Ray ◽  
Ntc Thermistor ◽  
Market Requirement ◽  
Electrical Data ◽  
Made In

Fabrication of Fe2TiO5 pellet/disk ceramics-based NTC thermistor has been performed, in order to know the effect of sintering tempertures on the electrical characteristic of 1.0 mole % MnO2 doped-Fe2TiO5 ceramics. These ceramics were made by mixing commercial powders of Fe2O3, TiO2 and MnO2 with proportional composition to produce Fe2TiO5 based ceramic. The raw pellet was sintered at 1100 °C, 1200 °C and 1300 °C temperature for 2 hours in air. Analysis of the microstructure and crystal structure were performed by using a scanning electron microscope (SEM) and x-ray diffraction (XRD) respectively. XRD pattern showed that all of Fe2TiO5 ceramics made ​​at various sintering temperatures are orthorhombic The SEM images showed that the grain size of pellet ceramics increase with increasing sintering temperatures. From electrical data that was measured at temperature 30-300 °C, showed that the addition of sintering temperature decreased the thermistor constant (B), activation energy (Ea), thermistor sensitivity (α) and room temperature resistance (RRT). Thermistor constant (B) of the ceramics was relatively big of 5778 K to 6707 K. The value of B indicated that ceramics made in this work fit the market requirement for NTC thermistor.

Effect of Temperature and Synthesis of CuO Nanostructures on Cu Plate by Thermal Method

2013 ◽  
Vol 634-638 ◽  
pp. 2160-2162 ◽  
Author(s):  
Benjara Supakosl ◽  
Vatcharinkorn Mekla ◽  
Chakkaphan Raksapha
Keyword(s):  
Thermal Evaporation ◽  
Metal Plate ◽  
Effect Of Temperature ◽  
Thermal Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
Xrd Pattern ◽  
X Ray ◽  
20 Nm

CuO nanostructures were synthesized by thermal evaporation method using Cu metal plate in air at temperatures ranging from 400 to 600 C for 6 h. The CuO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy, FE-SEM. X-ray diffraction, XRD pattern showed the bicrystal nanostructure of CuO and Cu2O. FE-SEM images indicated that the nanowires depended on temperatures. The diameter of Cuo nanowires varies from 10 nm to 20 nm and length of several 5 micrometers.

Characterization of Fe2O3 Nanowires and its Solar Cell Applications

2018 ◽  
Vol 766 ◽  
pp. 217-222
Author(s):  
Suphaporn Daothong
Keyword(s):  
Solar Cell ◽  
Iron Oxide ◽  
Oxidation Process ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Xrd Pattern ◽  
Oxide Nanowires ◽  
X Ray ◽  
Dye Sensitized

Iron oxide nanowires were synthesized on stainless steel mesh substrate using the thermal oxidation process at the varying temperature of 750°C for 60 min. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD pattern showed that the iron oxide nanowires exhibited the structure of alpha-Fe2O3 (hematite). SEM images indicated that the diameter and the length of the nanowires were 80 to 285 nm and more than 5 μm, respectively. The dye-sensitized solar cell (DSC) properties based on the nanowires substrate was also studied. It was found that the power conversion efficiency (η) of the device was 0.11%.

Effect of Temperature and Synthesis of ZnO Nanostructures on Zn Plate by Thermal Method

2013 ◽  
Vol 634-638 ◽  
pp. 2163-2165
Author(s):  
Oamphon Thongteel ◽  
Vatcharinkorn Mekla ◽  
Udom Tipparach
Keyword(s):  
Metal Plate ◽  
Effect Of Temperature ◽  
Thermal Method ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
Xrd Pattern ◽  
X Ray ◽  
Metal Plates

ZnO nanostructures were synthesized by thermal evaporation method using Zn metal plate in air. The Zn metal plates were frozen at -10 C, before into the furnace at a temperature ranging from 300 to 420 C for 15 minutes. The ZnO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy( FE-SEM) and X-ray diffraction( XRD) pattern showed the crystal nanostructure of ZnO. FE-SEM images indicated that the nanowires were depended on temperatures. The diameter of ZnO nanowires werevaried from 50 nm to 70 nm and length of several 100 micrometers.

scholarly journals Preparation of Fe0.8Mn1.54Ni0.66O4 Nano-Ceramics by Sol-gel auto combustion and N2 Annealing for High Reliable NTC Thermistor

2021 ◽  
Vol 7 ◽  
pp. 96-99
Author(s):  
Nam-Chol Yu ◽  
IlMan Pak ◽  
SonGuk Pak
Keyword(s):  
Spinel Structure ◽  
Spinel Phase ◽  
Sol Gel ◽  
Electrical Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
N2 Atmosphere ◽  
Auto Combustion ◽  
Ntc Thermistor ◽  
N2 Annealing

Fe0.8Mn1.54Ni0.66O4 nano-ceramics have been successfully prepared by sol-gel auto combustion. The microstructure and phase of these samples was observed by using Scanning Electron Microscopy and X-Ray Diffraction. The diameters of Fe0.8Mn1.54Ni0.66O4 ceramic particles pre-fired at 800℃ range from 52 to 83nm. The powder sintered at above 1050℃ has the compact and uniform spinel structure. We have investigated the electrical characteristics of these thermistors at different sintering temperatures and concluded that the sample sintered at 1200℃ is sufficient to form the appropriate spinel phase. Moreover, the thermistor annealed for 72h at 450~550℃ in N2 atmosphere has the drift value of <0.7%.

Investigation of ZnS Nanotubes Films: Morphological, Structural and Optical Properties

2019 ◽  
Vol 60 ◽  
pp. 142-153
Author(s):  
Bassam Abdallah ◽  
M. Kakhia ◽  
N. Alkafri
Keyword(s):  
Thermal Evaporation ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Sem Images ◽  
Xrd Pattern ◽  
X Ray ◽  
Atomic Force ◽  
Evaporation Technique ◽  
Pb Concentration

Pb doped ZnS nanotubes films have been deposited on glass and Si (100) substrates by a thermal evaporation technique. Energy dispersive spectroscopy (EDX) analysis has been used to identify the element’s compositions. Pb concentration in the prepared films was increased from 0 to about ~6 wt. %. The X- Ray Diffraction (XRD) pattern exhibited the wurtzite structure of ZnS with (002) preferred orientation. It shows that the calculated grain size increased with increase in Pb concentration. XRD analysis was also used to determine the strain in the films. Morphology and thickness of the films were obtained from surface and cross section of the films, using scanning electron microscopy (SEM) images. SEM images have confirmed the ZnS nanotubes and modifications of the morphology when adding Pb. Atomic force microscope (AFM) and SEM characterization have been shown dense structure and demonstrated the growth of spherical forms with nanostructure (nanotubes not created) for a film deposited without doping (0 wt. %). The transparency of the films has been deduced from UV-Vis spectra, where the band gap increased with increase in Pb concentration

Effect of F-doping on temperature dependence of resistivity of vanadium pentoxide thin films prepared by spray pyrolysis

2018 ◽  
Vol 32 (20) ◽  
pp. 1850229
Author(s):  
M. Mousavi ◽  
Gh. Khorami ◽  
A. Kompany ◽  
N. Shahtahmasebi
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Vanadium Pentoxide ◽  
Metallic Phase ◽  
Electrical Characteristics ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
Sem Images ◽  
X Ray ◽  
Transition Change

This paper reports structural and electrical characteristics of F-doped [Formula: see text]V2O5 thin films of different F concentrations. The films were analyzed by X-ray diffraction. It was found that F-doping in vanadium pentoxide affects the crystallinity of the samples. The SEM images have shown that by increasing the F-doping level, the size of the nanobelt increases. Electrical measurements indicated that the F-doping in [Formula: see text]V2O5 makes the temperature of phase transition change from semiconductor to metallic phase.

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

scholarly journals Hydrochloric Acid Modification and Lead Removal Studies on Naturally Occurring Zeolites from Nevada, New Mexico, and Arizona

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1238
Author(s):  
Garven M. Huntley ◽  
Rudy L. Luck ◽  
Michael E. Mullins ◽  
Nick K. Newberry
Keyword(s):  
New Mexico ◽  
Surface Area ◽  
Bet Surface Area ◽  
Lead Removal ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Naturally Occurring ◽  
27Al Mas Nmr ◽  
Modified Zeolites

Four naturally occurring zeolites were examined to verify their assignments as chabazites AZLB-Ca and AZLB-Na (Bowie, Arizona) and clinoptilolites NM-Ca (Winston, New Mexico) and NV-Na (Ash Meadows, Nevada). Based on powder X-ray diffraction, NM-Ca was discovered to be mostly quartz with some clinoptilolite residues. Treatment with concentrated HCl (12.1 M) acid resulted in AZLB-Ca and AZLB-Na, the chabazite-like species, becoming amorphous, as confirmed by powder X-ray diffraction. In contrast, NM-Ca and NV-Na, which are clinoptilolite-like species, withstood boiling in concentrated HCl acid. This treatment removes calcium, magnesium, sodium, potassium, aluminum, and iron atoms or ions from the framework while leaving the silicon framework intact as confirmed via X-ray fluorescence and diffraction. SEM images on calcined and HCl treated NV-Na were obtained. BET surface area analysis confirmed an increase in surface area for the two zeolites after treatment, NM-Ca 20.0(1) to 111(4) m2/g and NV-Na 19.0(4) to 158(7) m2/g. 29Si and 27Al MAS NMR were performed on the natural and treated NV-Na zeolite, and the data for the natural NV-Na zeolite suggested a Si:Al ratio of 4.33 similar to that determined by X-Ray fluorescence of 4.55. Removal of lead ions from solution decreased from the native NM-Ca, 0.27(14), NV-Na, 1.50(17) meq/g compared to the modified zeolites, 30 min HCl treated NM-Ca 0.06(9) and NV-Na, 0.41(23) meq/g, and also decreased upon K+ ion pretreatment in the HCl modified zeolites.

scholarly journals Electrospun Membranes Based on Polycaprolactone, Nano-Hydroxyapatite and Metronidazole

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 931
Author(s):  
Ioana-Codruţa Mirică ◽  
Gabriel Furtos ◽  
Ondine Lucaciu ◽  
Petru Pascuta ◽  
Mihaela Vlassa ◽  
...  
Keyword(s):  
Fiber Diameter ◽  
Maximum Load ◽  
Guided Bone Regeneration ◽  
Attenuated Total Reflectance ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Total Reflectance ◽  
X Ray ◽  
Electrospun Membranes

The aim of this research was to develop new electrospun membranes (EMs) based on polycaprolactone (PCL) with or without metronidazole (MET)/nano-hydroxyapatite (nHAP) content. New nHAP with a mean diameter of 34 nm in length was synthesized. X-ray diffraction (XRD) and attenuated total reflectance Fourier transform infrared spectroscopy (FTIR-ATR) were used for structural characterization of precursors and EMs. The highest mechanical properties (the force at maximum load, Young’s modulus and tensile strength) were found for the PCL membranes, and these properties decreased for the other samples in the following order: 95% PCL + 5% nHAP > 80% PCL + 20% MET > 75% PCL + 5% nHAP + 20% MET. The stiffness increased with the addition of 5 wt.% nHAP. The SEM images of EMs showed randomly oriented bead-free fibers that generated a porous structure with interconnected macropores. The fiber diameter showed values between 2 and 16 µm. The fiber diameter increased with the addition of nHAP filler and decreased when MET was added. New EMs with nHAP and MET could be promising materials for guided bone regeneration or tissue engineering.

Hydrothermal Synthesis and Characterization of BiFeO3 Polyhedral Crystallites

2012 ◽  
Vol 174-177 ◽  
pp. 508-511
Author(s):  
Lin Lin Yang ◽  
Yong Gang Wang ◽  
Yu Jiang Wang ◽  
Xiao Feng Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

BiFeO3 polyhedrons had been successfully synthesized via a hydrothermal method. The as-prepared products were characterized by power X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The possible mechanisms for the formation of BiFeO3 polyhedrons were discussed. Though comparison experiments, it was found that the kind of precursor played a key role on the morphology control of BiFeO3 crystals.

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