Determination of lattice parameters from synchrotron powder data: A study using high temperature data for tungsten and alumina

2006 ◽  
Vol 21 (1) ◽  
pp. 19-24 ◽  
Author(s):  
C. J. Ball
Keyword(s):  
High Temperature ◽  
Reference Material ◽  
High Temperatures ◽  
Lattice Parameter ◽  
Temperature Data ◽  
Lattice Parameters ◽  
Cell Parameters ◽  
Photon Factory ◽  
High Temperature Data

The lattice parameters of α-alumina have been determined for temperatures in the range 20<T<1050 °C, using the lattice parameter of tungsten as a thermometer and a simple furnace in the diffractometer on the Australian beamline at the Photon Factory, Tsukuba, Japan. It is shown that the accuracy of this technique for measurement of cell parameters at temperatures up to ∼1200 °C is limited at present by uncertainty in the cell parameters of the reference material (i.e., tungsten) at high temperatures. Some problems with the equipment are discussed.

Experimental Determination of Line Strengths for Selected Carbon Monoxide and Carbon Dioxide Absorption Lines at Temperatures between 295 and 1250 K

1994 ◽  
Vol 48 (11) ◽  
pp. 1442-1450 ◽  
Author(s):  
Patrick J. Medvecz ◽  
Kenneth M. Nichols
Keyword(s):  
Fourier Transform ◽  
High Temperature ◽  
Absorption Spectra ◽  
High Temperatures ◽  
Room Temperature ◽  
Theoretical Calculations ◽  
Line Strength ◽  
Temperature Data ◽  
Line Strengths

Fourier transform infrared absorption spectroscopy has been used for the determination of the line strengths of 41 CO and CO2 absorption lines at temperatures between 295 and 1250 K. The CO vibrational-rotational lines were from the P branch of the fundamental absorption band (2150–1950 cm−1) while the CO2 vibrational-rotational lines were from the far wing of the R branch of the v3 fundamental band (2395–2380 cm−1). The intensities of the lines were measured from absorption spectra recorded in a high-temperature gas cell containing known concentrations of CO/CO2/N2 gas mixtures at atmospheric pressure. Absorption spectra were recorded through the cell with the use of a moderate-resolution Fourier transform infrared spectrometer. The absorption spectra were mathematically corrected for distortions resulting from the finite resolution of the spectrometer and for peak overlap. Line strength measurements were made from the corrected peaks by using the Bouguer-Lambert law and assuming a Lorenztian line profile. The experimentally obtained line strengths were evaluated (1) by statistical calculations, (2) by consideration of the validity of the Bouguer-Lambert assumption for these data, (3) by comparison with existing room-temperature and high-temperature data, and (4) by comparison with theoretical calculations. For CO, the statistical analysis suggests that the reported values have an uncertainty of ±10–12%, which is similar to the observed discrepancies with other reported values at room temperature. At high temperatures, the difference between these data and previously reported data and theoretical predictions is less than 10%. For CO2, the statistical uncertainty associated with the line strength calculations is less than 5%, which is also the approximate level of agreement with existing room-temperature data. For lines with m indicies of 65–89, at high temperatures, the values reported in this work agree within 5 to 10% of theoretical calculations.

Oxygen-doped Sb4Te phase change films for high-temperature data retention and low-power application

2013 ◽  
Vol 551 ◽  
pp. 551-555 ◽  
Author(s):  
Yifeng Hu ◽  
Mingcheng Sun ◽  
Sannian Song ◽  
Zhitang Song ◽  
Jiwei Zhai
Keyword(s):  
High Temperature ◽  
Low Power ◽  
Phase Change ◽  
Temperature Data ◽  
Data Retention ◽  
High Temperature Data ◽  
Power Application

The lattice parameters of high-temperature triclinic sodic feldspars

1964 ◽  
Vol 33 (266) ◽  
pp. 949-962 ◽  
Author(s):  
I. S. E. Carmichael ◽  
W. S. MacKenzie
Keyword(s):  
High Temperature ◽  
Lattice Parameters ◽  
Good Measure

SummaryThe lattice parameters of twenty calcium-bearing anorthoclases and potassium-bearing acid plagioclases have been determined by powder methods. The 201̄ spacing of the homogenized anorthoclases gives a good measure of the Or content irrespective of the amount of calcium present ; this spacing combined with α* (010): (001) may be used to determine the ternary composition of homogeneous feldspars more potassic than approximately Or15. The lattice parameters of feldspars less potassic than Or15 cannot be used for the determination of their ternary composition.

Determination of Properties of Concrete Floor after a Fire and Renovation

2016 ◽  
Vol 677 ◽  
pp. 33-38 ◽  
Author(s):  
Karel Mikulica ◽  
Rudolf Hela ◽  
Ámos Dufka
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Concrete Floor ◽  
Total Destruction ◽  
Factory Building

Concrete exposed to high temperature considerably changes its properties down to total destruction. The paper describes renovation of concrete floor damaged by a fire of a factory building. Individual steps of determination of damage of concrete floor structures caused by high temperatures are described. Structure of damaged floor was technically analyzed, redevelopment was designed and renovation works were carried out.

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