Synthesis of a Novel B3CN3 Compound by Pyrolysis of Precursor

2007 ◽  
Vol 336-338 ◽  
pp. 1080-1083 ◽  
Author(s):  
Jian Yang ◽  
Tai Qiu ◽  
Chun Ying Shen
Keyword(s):  
Raw Materials ◽  
Pyrolysis Product ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Organic Precursor ◽  
Xps Spectra ◽  
N2 Atmosphere ◽  
Graphite Structure ◽  
Approximate Composition ◽  
C And N

An organic precursor was synthesized with C3N6H6 and H3BO3 as raw materials in aqueous solution. A novel amorphous BCN compound was obtained by thermolysis of the precursor at 1900°C in flowing N2 atmosphere. Single crystal X-ray diffraction analysis reveals that the precursor is a supramolecular compound with a formula C3N6H6(H3BO3)2. The pyrolysis product was characterized by XRD, XPS, FTIR, and SEM. XRD results reveal that the pyrolysis product has a turbostratic graphite structure. XPS analysis confirms the formation of nitrogen-rich BCN ternary compound with an approximate composition of B3CN3. Both the deconvoluted XPS spectra and FTIR spectrum indicate that B-N, B-C, and C-N chemical bonds have been established and there is no phase separation of graphite and h-BN occurred, which suggests an atomic-level hybrid of B, C, and N in the compound. SEM images show that the crystal shape of the B3CN3 compound is columnar, which is similar to the precursor.

scholarly journals Effect of Magnesium Borates on the Fire-Retarding Properties of Zinc Borates

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Azmi Seyhun Kipcak ◽  
Nil Baran Acarali ◽  
Emek Moroydor Derun ◽  
Nurcan Tugrul ◽  
Sabriye Piskin
Keyword(s):  
Raw Materials ◽  
High Strength ◽  
High Heat ◽  
Zinc Borate ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Magnesium Borate ◽  
Sem Images ◽  
Ir And Raman Spectroscopies ◽  
Coefficient Of Elasticity

Magnesium borate (MB) is a technical ceramic exhibiting high heat resistance, corrosion resistance, great mechanical strength, great insulation properties, lightweightness, high strength, and a high coefficient of elasticity. Zinc borate (ZB) can be used as a multifunctional synergistic additive in addition to flame retardant additives in polymers. In this study, the raw materials of zinc oxide (ZnO), magnesium oxide (MgO), and boric acid (H3BO3) were used in the mole ratio of 1 : 1 : 9, which was obtained from preexperiments. Using the starting materials, hydrothermal synthesis was applied, and characterisation of the products was performed using X-Ray diffraction (XRD) and Fourier transform infrared (FT-IR) and Raman spectroscopies. The forms of Zn3B6O12·3.5H2O, MgO(B2O3)3·7(H2O), and Mg2(B6O7(OH)6)2·9(H2O) were synthesised successfully. Moreover, the surface morphology was investigated using scanning electron microscopy (SEM), and the B2O3content was determined. In addition, the reaction yields were calculated. The results of the B2O3content analysis were in compliance with the literature values. Examination of the SEM images indicated that the obtained nanoscale minerals had a reaction efficiency ranging between 63–74% for MB and 87–98% for ZB. Finally, the fire-retarding properties of the synthesised pure MBs, pure ZBs, and mixtures of MB and ZB were determined using differential thermal analysis and thermal gravimetry (DTA-TG) and differential scanning calorimetry (DSC).

Effect of Polyvinyl Pyrrolidone Dosage on Barium Ferrite Fibers via Electrospinning

2016 ◽  
Vol 848 ◽  
pp. 333-338
Author(s):  
Yue Guang Chen ◽  
Gui Fang Liu ◽  
Shi Jiao Wang
Keyword(s):  
Barium Ferrite ◽  
Raw Materials ◽  
Precursor Solution ◽  
Vinyl Pyrrolidone ◽  
Dimethyl Formamide ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Vibration Sample Magnetometer ◽  
Poly Vinyl Pyrrolidone ◽  
Xrd Patterns

Barium ferrite micro/nanofibers were successfully prepared via the electrospinning by using dimethyl formamide (DMF) as the solvent, poly vinyl pyrrolidone (PVP) as the spinning auxiliaries and iron nitrate and barium nitrate as raw materials. The effect of poly vinyl pyrrolidone on the structure, morphology, magnetic and microwave absorbing properties were investigated by scanning electron microscope (SEM), X-ray diffraction analysis (XRD), vibration sample magnetometer (VSM) and vector network analyzer (VNA). XRD patterns of the samples confirmed that when the additive content of PVP was up to 10%, (wt%) pure barium ferrite fibers formed under the condition of the same heat treatment. Also, the FE-SEM images showed that the morphology of the fibers improved with the increase of PVP content. Moreover, the VSM results demonstrated that the saturation magnetization can reach 54.7 emu/g when the PVP dosage is 14% (wt%) in the precursor solution.

Optical Properties of Nano-CuInSi Thin Films Prepared by Multilayer Synthesized Method

2011 ◽  
Vol 403-408 ◽  
pp. 1094-1098
Author(s):  
Jian Sheng Xie ◽  
Ping Luan ◽  
Jin Hua Li
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Film Surface ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
N2 Atmosphere ◽  
Double Beam ◽  
Absorption Studies ◽  
Different Temperatures

Thin Nano-CuInSi films have been prepared by multilayer synthesized method using magnetron sputtering technology, and followed by annealing in N2 atmosphere at different temperatures. The structures of CuInSi films were detected by X-ray diffraction(XRD); X-ray diffraction studies of the annealed films indicate the presence of CuInSi, the peak of main crystal phase is at 2θ=42.450°; the morphology of the film surface was studied by SEM. The SEM images show that the crystalline of the film prepared by multilayer synthesized method was granulated. The transmittance (T) spectra of the films were measured by Shimadzu UV-2450 double beam spectrophotometer. The calculated absorption coefficient is larger than 105 cm−1 when the wavelength is shorter than 750 nm. The band gap has been estimated from the optical absorption studies and found to be about 1.47 eV, but changes with purity of CuInSi. CuInSi thin film is a potential absorber layer material applied in solar cells and photoelectric automatic control.

Alumina Residue Characterization to Produce Tubular Ceramic Membranes

2012 ◽  
Vol 727-728 ◽  
pp. 1508-1513 ◽  
Author(s):  
Iliana Oliveira Guimarães ◽  
Hélio Lucena Lira ◽  
Sidinei Kleber da Silva ◽  
Suellen Lisboa Dias ◽  
Rosa do Carmo de Oliveira Lima
Keyword(s):  
Electrostatic Precipitator ◽  
Raw Materials ◽  
Environmental Issues ◽  
Ceramic Membranes ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Calcination Process ◽  
X Ray ◽  
Two Samples

ndustrial wastes recycling become attractive due to raw materials economy (sustainability) and environmental issues. This research objective was to characterize a residue generated during the alumina calcination process (electrostatic precipitator dust), to be applied on the development of tubular ceramic membranes. In this context, two samples were analyzed, a crude residue (sample A) as supplied by the industry and other calcined residue (sample B). As verified by X-ray fluorescence spectroscopy by dispersive energy (XDE), the samples A and B showed a high content of alumina in chemical compositions, both close to 96%. Gibbsite and α-alumina crystalline phases were identified by X-ray diffraction (XRD) in the samples. At scanning electron microscopy (SEM) images, could be observed agglomerates of particles with asymmetric shapes and a wide particle size distribution like was confirmed by laser diffraction, which showed that the particles diameters remained almost unchanged after calcination at 700°C. Results revealed no significant differences between samples characteristics, indicating that the crude and calcined residues could be used to prepare ceramic membranes.

Effect of mechanical alloying on the synthesis of Fe-TiC nanocomposite

2017 ◽  
Vol 24 (5) ◽  
pp. 739-745 ◽  
Author(s):  
Ali Reza Jam ◽  
Mansour Razavi ◽  
Leila Nikzad
Keyword(s):  
Mechanical Alloying ◽  
Crystallite Size ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Sem Images ◽  
The Mean ◽  
Xrd Patterns ◽  
Tic Particulates ◽  
Mean Strain ◽  
Microstructural Studies

AbstractTiC particulates-reinforced Fe-based nanocomposites were fabricated using ferrotitanium and carbon black powders by mechanical alloying (MA). The raw materials were milled in a planetary ball mill and sampled in different times. The phase type, crystallite size, and mean strain of milled samples were estimated by X-ray diffraction (XRD) instrument. The scanning electron microscopy (SEM) images of milled powders showed that titanium carbide was synthesized gradually after 90 min of milling and its formation was completed after 5 h and the crystallite size of the produced carbide was in nanometer scale. Increasing milling times gave rise to the reduction of crystallite size as well as the augmentation of the mean strain. Microstructural studies confirmed the accuracy of crystallite size calculations by XRD patterns.

Synthesis of the ZrB2-SiC Ceramic from Polymeric Precursor Pyrolysis

2018 ◽  
Vol 281 ◽  
pp. 382-388
Author(s):  
Rong Cai ◽  
Zhao Kun Ma ◽  
Hai Peng Qiu ◽  
Shan Hua Liu ◽  
Wei Jie Xie ◽  
...  
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Pyrolysis Product ◽  
Zirconium Boride ◽  
Gravimetric Analysis ◽  
Pyrolysis Process ◽  
X Ray Diffraction ◽  
Pyrolysis Products ◽  
Organic Precursor ◽  
Sic Ceramic ◽  
Intermediate Pyrolysis

A ZrB2-SiC multiphase ceramic was fabricated with a precursor pyrolysis method by using zirconium boride organic precursor and polycarbosilane. In order to study the pyrolysis process of complex phase ceramics, the pyrolysis process of the two precursors was studied respectively at the beginning. The precursor and the mixture with different weight ratios both pyrolyzed at 800°C. ~1500°C. under argon atmosphere. The specimens were characterized by thermo-gravimetric analysis, infra-red, X-ray diffraction. It was found that the pyrolysis products of PCS remained amorphous below 1000°C. and converted into crystallization with temperature increasing. ZrO2as the intermediate pyrolysis product of ZrB2precursor initiate convert to t-ZrO2from m-ZrO2at 1200°C.. Finally, all kinds of ZrB2-SiC multiphase ceramic are successful obtained via pyrolysis of precursor after 1500°C. And the 40wt%ZrB2precursor initial carbothermal reduction temperature below the ZrB2precursor reactive temperature and the crystal degree of SiC is higher than pyrolysis product of PCS.

Sublimation Growth of Aluminum Nitride-Silicon Carbide Alloy Crystals on SiC (0001) Substrates

2004 ◽  
Vol 831 ◽  
Author(s):  
Z. Gu ◽  
J.H. Edgar ◽  
E.A. Payzant ◽  
H.M. Meyer ◽  
L.R. Walker ◽  
...  
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
The Third ◽  
N2 Atmosphere ◽  
Approximate Composition ◽  
Dimensional Growth ◽  
Dark Green ◽  
Binary Compounds ◽  
Sublimation Growth ◽  
Good Homogeneity

ABSTRACTThick (up to 1 mm) AlN-SiC alloy crystals were grown on off-axis Si-face 6H-SiC (0001) substrates by the sublimation-recondensation method from a mixture of AlN and SiC powders at 1860–1990 °C in a N2 atmosphere. The color of the crystals changed from clear to dark green with increasing growth temperature. Raman spectroscopy and x-ray diffraction (XRD) confirmed an AlN-SiC alloy was formed with the wurtzite structure and good homogeneity. Three broad peaks were detected in the Raman spectra, with one of those related to an AlN-like and another one to a SiC-like mode, both shifted relative to their usual positions in the binary compounds, and the third broad peak with possible contributions from both AlN and SiC. Scanning Auger microanalysis (SAM) and electron probe microanalysis (EPMA) demonstrated the alloy crystals had an approximate composition of (AlN)0.75(SiC)0.25 with a stoi chiometric ratio of Al:N and Si:C. The substrate mi sorientati on ensured a two-dimensional growth mode confirmed by scanning electron microscopy (SEM).

scholarly journals A Salt-Assisted Combustion Method to Prepare Well-Dispersed Octahedral MnCr2O4Spinel Nanocrystals

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Yuping Tong ◽  
Juntao Ma ◽  
Shunbo Zhao ◽  
Hongyuan Huo ◽  
Hailong Zhang
Keyword(s):  
Electron Microscopy ◽  
Raw Materials ◽  
Combustion Process ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Transmission Electron ◽  
Ft Ir ◽  
Average Size ◽  
Octahedral Nanocrystals

Well-dispersed nanocrystalline MnCr2O4was prepared by a salt-assisted combustion process using low-toxic glycine as fuel and Mn(NO3)2and Cr(NO3)3·9H2O as raw materials. The obtained products were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared (FT-IR) spectroscopy, Raman spectroscopy, Transmission Electron Microscopy (TEM), and Scanning Electron Microscopy (SEM). The fabrication process was monitored by thermogravimetric and differential thermal analysis (TG-DTA). The phase formation process was detected by XRD, and MnCr2O4single phase with high crystallinity was formed at 700°C. TEM and SEM images revealed that the products were composed of well-dispersed octahedral nanocrystals with an average size of 80 nm. Inert salt-LiCl played an important role in breaking the network structure of agglomerated nanocrystallites.

Effect of NH4Cl Flux on Structural and Luminescent Properties of CaS: Eu2+ Phosphors

2014 ◽  
Vol 989-994 ◽  
pp. 755-758
Author(s):  
Yun Jie Zhang ◽  
Jie Zhao ◽  
Da Jian Wang ◽  
Jian Ma
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Raw Materials ◽  
Luminescent Properties ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Structure Morphology ◽  
Scanning Electron

CaS:Eu2+phosphors were prepared by two steps method at a relatively low temperature (1050°C) using NH4Cl as a flux. The influences of NH4Cl flux concentrations on the crystal structure, morphology and photoluminescent properties of CaS:Eu2+phosphors were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL), respectively. XRD analysis shows that when the raw materials added with the NH4Cl flux, the crystal structure was not changed .The SEM images indicate that increase of the NH4Cl flux enlarged the grain size of the phosphor particles. The luminescence intensity of CaS:Eu2+was enhanced with adding NH4Cl flux and up to the maximum emission intensity when the addition of NH4Cl flux is 1wt%.

Preparation of a Novel Carbon Nano-Material Studded Iron Granules from Needle Coke by Arc Method

2007 ◽  
Vol 336-338 ◽  
pp. 2186-2188
Author(s):  
Xue Fei Zhao ◽  
Ye Xin Sun ◽  
Tian Jun Sun ◽  
Jie Shan Qiu
Keyword(s):  
Electron Microscopy ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Needle Coke ◽  
Sem Images ◽  
Transmission Electron ◽  
Nano Material ◽  
Graphite Structure ◽  
Diffraction Peaks ◽  
Analytical Result

A novel nano-material of carbon rod studded iron granules on its surface was prepared from needle coke with iron as catalyst by arc method in the vacuum condition. Its structure and composition was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). In the SEM images the carbon material showed cotton-like. The TEM results showed that the nano-material was bar-like with diameter of 20nm to 50nm and there were lots of iron particles studded on its surface. The analytical result of EDS showed that the chemical composition of materials mainly consisted of carbon and iron elements. The XRD analysis revealed that there were two sharp diffraction peaks, one was at 26.2° which corresponded to the (002) plane of graphite structure and the other was at 43.2° which corresponded to the (fcc) γ-Fe structure. The nano-material might be used as catalyst in the chemical reaction.

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