High-temperature IR-spectroscopic investigation of the structural and kinetic characteristics of sulfate formation by thermal decomposition of potassium persulfate

1976 ◽  
Vol 24 (4) ◽  
pp. 484-487 ◽  
Author(s):  
A. I. Lapshin ◽  
K. A. Tleulieva
Keyword(s):  
Thermal Decomposition ◽  
High Temperature ◽  
Spectroscopic Investigation ◽  
Potassium Persulfate ◽  
Kinetic Characteristics ◽  
Sulfate Formation ◽  
Ir Spectroscopic

IR-spectroscopic investigation of hydroxyethylethylenediaminetriacetic acid and its potassium salt

1975 ◽  
Vol 24 (4) ◽  
pp. 705-708
Author(s):  
�. D. Filippova ◽  
N. D. Mitrofanova ◽  
L. I. Martynenko ◽  
V. I. Spitsyn
Keyword(s):  
Spectroscopic Investigation ◽  
Potassium Salt ◽  
Ir Spectroscopic

IR spectroscopic investigation of tautomeric changes in 1,2-bis(o-hydroxyphenoxy) ethane

1976 ◽  
Vol 25 (4) ◽  
pp. 1327-1328
Author(s):  
A. G. Dubinin ◽  
B. Ya. Eryshey ◽  
Yu. I. Urusov ◽  
B. P. Yatsenko
Keyword(s):  
Spectroscopic Investigation ◽  
Ir Spectroscopic

IR spectroscopic investigation of the crystalline forms of 2,4-tolylene diglycidy lurethan

1976 ◽  
Vol 25 (3) ◽  
pp. 1129-1132 ◽  
Author(s):  
S. V. Vladimirov ◽  
L. I. Maklakov ◽  
A. G. Sinaiskii ◽  
S. B. Grasinskaya
Keyword(s):  
Spectroscopic Investigation ◽  
Ir Spectroscopic ◽  
Crystalline Forms

The OH site in topaz: an IR spectroscopic investigation

2010 ◽  
Vol 37 (9) ◽  
pp. 653-664 ◽  
Author(s):  
Anke Watenphul ◽  
Eugen Libowitzky ◽  
Bernd Wunder ◽  
Matthias Gottschalk
Keyword(s):  
Spectroscopic Investigation ◽  
Ir Spectroscopic

scholarly journals High Temperature Degradation Mechanism of Concrete with Plastering Layer

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 398
Author(s):  
Chihao Liu ◽  
Jiajian Chen
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Thermal Decomposition ◽  
Electron Microscope ◽  
High Temperature ◽  
Thermogravimetric Analysis ◽  
Degradation Mechanism ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Scanning Electron

At present, the research on the high temperature degradation of concrete usually focuses on only the degradation of concrete itself without considering the effect of the plastering layer. It is necessary to take into account the influence of the plastering layer on the high temperature degradation of concrete. With an increase in the water/cement ratio, the explosion of concrete disappeared. Although increasing the water/cement ratio can alleviate the cracking of concrete due to lower pressure, it leads to a decrease in the mechanical properties of concrete after heating. It is proved that besides the water/cement ratio, the apparent phenomena and mechanical properties of concrete at high temperature can be affected by the plastering layer. The plastering layer can relieve the high temperature cracking of concrete, and even inhibit the high temperature explosion of concrete with 0.30 water/cement ratio. By means of an XRD test, scanning electron microscope test and thermogravimetric analysis, it is found that the plastering layer can promote the rehydration of unhydrated cement particles of 0.30 water/cement ratio concrete at high temperature and then promote the mechanical properties of concrete at 400 °C. However, the plastering layer accelerated the thermal decomposition of C-S-H gel of concrete with a water/cement ratio of 0.40 at high temperature, and finally accelerate the decline of mechanical property of concrete. To conclude, the low water/cement ratio and plastering layer can delay the deterioration of concrete at high temperature.

High-Pressure Synthesis, Crystal Structure, and Properties of the New Orthorhombic Rare-Earth meta-Oxoborates RE(BO2)3 (RE = Dy – Lu)

2004 ◽  
Vol 59 (2) ◽  
pp. 202-215 ◽  
Author(s):  
Holger Emme ◽  
Tanja Nikelski ◽  
Thomas Schleid ◽  
Rainer Pöttgen ◽  
Manfred Heinrich Möller ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Ambient Pressure ◽  
Structure And Properties ◽  
Crystal Data ◽  
Temperature Conditions ◽  
Pressure Synthesis ◽  
Ir Spectroscopic ◽  
Pressure Phase

The new orthorhombic meta-oxoborates RE(BO2)3 (≡REB3O6) (RE = Dy-Lu) have been synthesized under high-pressure and high-temperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 1100 °C. They are isotypic to the known ambient pressure phase Tb(BO2)3, space group Pnma. In contrast to Dy(BO2)3, which was also obtained in small amounts under high-temperature conditions, the preparation of the higher orthorhombic homologues RE(BO2)3 (RE = Ho-Lu) was only possible using high-pressure. The meta-oxoborates RE(BO2)3 (RE = Dy-Er) were synthesized as pure products, whereas the orthorhombic phases with RE = Tm-Lu were only obtained as byproducts. With the exception of Yb(BO2)3 it was possible to establish single crystal data for all compounds. The results of temperature-resolved in-situ powder-diffraction measurements, DTA, IR-spectroscopic investigations, and magnetic properties are also presented.

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