scholarly journals Synthesis and characterization of wollastonite-2Mby using a diatomite precursor

2018 ◽  
Vol 82 (1) ◽  
pp. 95-110 ◽  
Author(s):  
Daniela Novembre ◽  
Carla Pace ◽  
Domingo Gimeno
Keyword(s):  
Solid Phase ◽  
Ambient Pressure ◽  
Quantitative Phase Analysis ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Chemical Treatments ◽  
Natural Rock ◽  
Reactive Silica ◽  
Data Estimation

ABSTRACTSolid phase reaction synthesis of wollastonite-2Mby a natural rock precursor as the source of amorphous silica and CaCO3is reported. Chemical treatments were carried out on a diatomitic rock from Crotone (Calabria, Italy) in order to measure its reactive silica and CaCO3contents. Four series of synthesis were performed at 1000°C at ambient pressure by mixing, at different stoichiometry, the diatomitic rock with a natural limestone as a source of additive CaCO3, and sodium carbonate (Na2CO3) as triggering agent.Wollastonite-2Mwas characterized by chemo-physical, crystallographical and morphological-microtextural analyses. All these characterizations, together with infrared and nuclear magnetic resonance (29Si) responses provide values comparable to literature data. Estimation of the amorphous phase in the synthesis powders was performed through quantitative phase analysis using the combined Rietveld and reference intensity ratio methods, resulting in a final product of 96.3% wollastonite-2M.

Study on the Synthesis and Characterization of PANi/Nano-CeO2 Composites

2007 ◽  
Vol 124-126 ◽  
pp. 287-290 ◽  
Author(s):  
Fei Liu ◽  
Yong Jun He ◽  
Jeung Soo Huh
Keyword(s):  
In Situ Polymerization ◽  
Solid Phase ◽  
Polymerization Reaction ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Average Size

The nano-CeO2 was synthesized by two-step solid-phase reaction. The image of TEM showed that nano-CeO2 with an average size of about 70 nm. The series of polyaniline/nano-CeO2 composites with different PANi: CeO2 ratios were prepared by in-situ polymerization in the presence of hydrochloric acid (HCl) as dopant by adding nano-CeO2 into the polymerization reaction mixture of aniline. The composites obtained were characterized by FT-IR and UV-vis spectroscopy analysis. The FT-IR spectra of nanocomposites indicate different blue-shifts, attributed to C–N stretching mode for benzenoid unit. The UV-vis spectra of nanocomposites display einstein-shifts compared with PANi at 620nm. The conductivity properties of the composites are also changed compare to the pure PANi. These results suggest that the interactions between the polymer matrix and nanoparticles take place in polyaniline/nano- CeO2 composites.

Characterization of Si/SiGe Heterostructures on Si Formed by Solid Phase Reaction

2002 ◽  
Vol 149 (3) ◽  
pp. G209 ◽  
Author(s):  
C. H. Huang ◽  
Albert Chin ◽  
W. J. Chen
Keyword(s):  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction

Characterization of Zirconium Germanosilicide Formed by Solid State Reaction of ZR With Sil−xGex Alloys

1995 ◽  
Vol 402 ◽  
Author(s):  
Z. Wang ◽  
D. B. Aldrich ◽  
P. Goeller ◽  
R. J. Nemanich ◽  
D. E. Sayers
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Sheet Resistance ◽  
Solid State Reaction ◽  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Final Phase ◽  
The Stability

AbstractWe have investigated the electrical and structural properties of zirconium germanosilicide (Zr-Si-Ge) films formed during the Zr-Sil−xGex solid state reaction. Thin films of C49 Zr(Si1−xGex)2 were formed from the solid phase reaction of Zr and Si1−xGex bilayer structures. It was observed that Zr reacts uniformly with the Sil−xGex alloy and that C49 Zr(Si1−x Gex)2 is the final phase of the Zr-Si1−xGex, solid phase reaction (such tht y = x) for all compositions examined (x = 0.20, 0.33, and 0.50). The sheet resistance of the Zr(Si1−xGex)2 thin films were higher than the sheet resistance measured for ZrSi2 films. The stability of Zr(Sil−x Gex)2 in contact with Si1−Gex was investigated and no germanium segregation was detected in the Zr(Si1−xGex)2/Si1−Gex structures.

Syntheses and characterization of zeolites K-F and W type using a diatomite precursor

2014 ◽  
Vol 78 (5) ◽  
pp. 1209-1225 ◽  
Author(s):  
D. Novembre ◽  
C. Pace ◽  
D. Gimeno
Keyword(s):  
Potassium Hydroxide ◽  
Rietveld Method ◽  
Morphological Characterization ◽  
Raw Material ◽  
Quantitative Phase Analysis ◽  
Cell Parameters ◽  
Chemical Treatments ◽  
Natural Rock

AbstractZeolites K-F and W (EDI and MER types) were synthesized hydrothermally using a natural rock as raw material. Chemical treatments were carried out on a diatomitic rock (containing opaline silica) from Crotone (Calabria, Italy) in order to separate/obtain potassium silicate, a reagent necessary for synthesizing zeolites. Synthesis experiments were performed by mixing the obtained siliceous solution with potassium hydroxide and alumina in varying proportions at 150°C and room pressure. Four synthesis series were performed to form zeolite K-F (EDI) and zeolite W (MER).The chemical-physical and morphological characterization of the zeolite phases were carried out. Cell parameters were calculated using the Rietveld method. Infrared, thermal and nuclear magnetic resonance (29Si) experiments confirmed the high quality of the zeolite products. The amorphous phase in the synthesis powders was estimated with quantitative phase analysis using the combined Rietveld and reference intensity ratio methods.

Characterization of Structural and Chemical Properties of Silver Containing Hydroxyapatite Synthesized by Solid Phase Reaction

2016 ◽  
Vol 720 ◽  
pp. 3-6 ◽  
Author(s):  
Takayuki Murakami ◽  
Iwao Noda ◽  
Junji Ikeda ◽  
Atsushi Nakahira
Keyword(s):  
Heat Treatment ◽  
Solid Phase ◽  
Xanes Spectrum ◽  
Metallic Silver ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Edge Structure ◽  
X Ray ◽  
Ft Ir

In this study, we investigated the physical and chemical state changes of silver in silver-containing hydroxyapatite (AgHA) composites sintered at various heat treatment temperatures. AgHA composites were synthesized by a solid phase reaction at various temperatures using composite powder prepared by ball-milling commercial highly crystalline hydroxyapatite powder and commercial silver oxide powder. Structural characterization of AgHA was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray absorption near edge structure (XANES). The XRD measurement showed that peaks of metallic silver or other silver compounds disappeared at 800°C and reappeared at 1000°C. The a-axis of HA obtained by Rietveld analysis expanded drastically at 800°C. Furthermore, the SEM images showed that silver particles disappeared at 800°C and reappeared at 1000°C, as indicated by the XRD patterns. The XANES spectrum of Ag-L3 edge of AgHA sintered at 800°C was different compared to those of other references. These results suggested that calcium ions were substituted by silver ions in AgHA sintered at 800°C, according to the a-axis expansion of HA lattice caused by the substitution of hydroxyl ions by carbonate ions through the heat treatment, based on the FT-IR measurement. In addition, antibacterial tests showed that AgHA containing various chemical states of silver had good antibacterial activities in proportion to released amounts of silver.

PREPARATION AND CHARACTERIZATION OF MnSi1.7 THIN FILMS

2002 ◽  
Vol 16 (15n16) ◽  
pp. 583-588 ◽  
Author(s):  
ZHIMIN WANG ◽  
QINGRUN HOU ◽  
YUANJIN HE
Keyword(s):  
Solid Phase ◽  
Annealing Process ◽  
Silicon Substrates ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Thermal Annealing Process

MnSi 1.7 films were prepared by Solid Phase Reaction on Si(100) substrates under UHV conditions. Auger Electron Spectroscopy (AES) and X-ray diffraction (XRD) were used to study the composition and the structure of the MnSi x films. Compared with the reactive-deposited MnSi 1.7 films on silicon substrates, severe diffusion of manganese atoms into the silicon substrate during the thermal annealing process was observed. If the annealing process was not long enough, the phenomenon of coexistence of manganese-rich and silicon-rich silicides was found. The electrical resistivity of MnSi 1.7 films was measured in the temperature range of 30°C to 450°C. The resistivity increases gradually with temperature in the temperature range measured.

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