Quantitative Analysis of Sphene (CaTiOSiO4) and Wollastonite (CaSiO3) Crystallizations in Annealed Ceramic Frits by FT-IR Absorption Spectroscopy

1993 ◽  
Vol 47 (7) ◽  
pp. 965-972 ◽  
Author(s):  
S. K. Chen ◽  
H. S. Liu ◽  
C. S. Wu

Results of this study have shown the feasibility of FT-IR absorption spectra (between 500 and 700 cm−1) for the quantitative determination of the nucleation and crystal growths of sphene (CaTiOSiO4) and wollastonite (β-CaSiO3) in two separate typical ceramic frits that have been annealed between 800 and 1000°C. Synthetic sphene ceramics and natural wollastonite, both of high purity and excellent crystallinity, serve as standard materials for calibration by the classical least-squares method (Basic Quant), employing the peaks of a sharp band at 561–566 cm−1 assigned to the SiO4 vibration and that of a shoulder (676 cm−1) of a broad band assigned to TiO6 vibrations. The correlation coefficients for these calibrations (absorbance vs. concentration of crystalline phase) are given as 0.9964, 0.9936, and 0.9937, respectively. Between annealing temperatures of 850 and 1000°C, both sphene and wollastonite phases appear to grow steadily in frit-S and frit-W, when the highest value of crystal growth is noted for specimens annealed at 1000°C, being approximately 80 wt % and 66 wt % of the formulated content, respectively. Scanning electron micrographs provide pictorial evidence to show that quantitative characterization of crystalline phase growth in ceramic frits by FT-IR absorption spectra is an appropriate technique.

1989 ◽  
Vol 44 (4) ◽  
pp. 295-299 ◽  
Author(s):  
R. Zamboni ◽  
D. Schweitzer ◽  
H. J. Keller ◽  
C. Taliani

Abstract IR absorption spectra of polycrystalline pressed samples of the organic metals α-(BEDT-TTF)2I3, β-BEDT-TTF)2I3 and (BEDT-TTF)2Cu(NCS)2 are presented and discussed. Normal protonated as well as deuterated materials were studied. The spectra range from 400 cm-1 to 5000 cm-1 and are similar to the IR reflectance spectra reported ealier. The data are of special interest in view of the fact that recently bulk superconductivity was observed in such polycrystalline samples of organic metals, and therefore the application of organic superconductors for the preparation of electronic devices seems possible.


2009 ◽  
Vol 49 (6) ◽  
pp. 500-506
Author(s):  
Yu. A. Poplavskii ◽  
V. I. Serdyukov ◽  
L. N. Sinitsa ◽  
A. P. Shcherbakov ◽  
M. Yu. Bezvinnyi ◽  
...  

1980 ◽  
Vol 45 (3) ◽  
pp. 800-809 ◽  
Author(s):  
Štefan Kúdela ◽  
Ján Garaj ◽  
Helena Hofbauerová ◽  
Viktor Kettmann

Some physicochemical properties of sodium pentamethylenedithiocarbamate and complexes with Cu(II), Ni(II), and Fe(III) were studied. The bands in the electronic and IR absorption spectra were measured and characterized, and the possibility of coulometric determination of NaS2CN(CH2)5.2 H2O was examined. The conditions for spectrophotometric determination of trace quantities of Cu(II), Ni(II), and Fe(III) as dithiocarbamate complexes were established and the stability constants of the complexes were determined.


2020 ◽  
Vol 11 (3-2020) ◽  
pp. 38-43
Author(s):  
А. A. Gabain ◽  

The analysis of structural particularities of nominally pure and doped LiNbO3single crystals was performed by methods of Raman light scattering and infrared absorption. The concentration of OH groups, as well as the concentration of point defects is calculated from IR absorption spectra in the region of stretching vibrations of OH groups. A correlation has been determined in behavior of IR absorption spectra bands of strongly doped LiNbO3:Zn crystals with the behavior of the Raman spectra band that correspondsto stretching bridge vibrations of oxygen atoms in octahedra along the polar axis.


1992 ◽  
Author(s):  
Del R. Lawson ◽  
Daniel L. Feldheim ◽  
Colby A. Foss ◽  
Peter K. Dorhoug ◽  
C. M. Elliott

1976 ◽  
Vol 30 (2) ◽  
pp. 200-204 ◽  
Author(s):  
F. M. Abdel Kerim ◽  
F. Abou El Fotouh

The ir absorption spectra of some pyridine derivatives-iodine complexes were measured in the region 400 to 1400 cm−1 and the results are discussed. The effect of complex formation on the intensities of some of the bands was investigated. The thermodynamic constants of these complexes were calculated. It was found that the stability of the complex depends to a large extent on the electronegativity as well as the position of the substituent on the pyridine nucleus. The structures of formed complexes are discussed.


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