Determination of the linear expansion coefficient of CoWC η-carbides using a high temperature X-ray diffraction technique

1977 ◽  
Vol 51 (2) ◽  
pp. 333-341 ◽  
Author(s):  
A. Thelin ◽  
N.O. Ersson ◽  
B.O. Haglund
Keyword(s):  
High Temperature ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Linear Expansion Coefficient ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Determination of Chromite Sands Suitability for Use in Moulding Sands

2017 ◽  
Vol 17 (2) ◽  
pp. 107-110
Author(s):  
K. Stec ◽  
J. Podwórny ◽  
B. Psiuk ◽  
Ł. Kozakiewicz
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Chemical Composition ◽  
Chemical Properties ◽  
Grinding Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Spectroscopy Technique ◽  
X Ray

Abstract Using the available analytical methods, including the determination of chemical composition using wavelength-dispersive X-ray fluorescent spectroscopy technique and phase composition determined using X-ray diffraction, microstructural observations in a highresolution scanning microscope equipped with an X-ray microanalysis system as well as determination of characteristic softening and sintering temperatures using high-temperature microscope, the properties of particular chromite sands were defined. For the study has been typed reference sand with chemical properties, physical and thermal, treated as standard, and the sands of the regeneration process and the grinding process. Using these kinds of sand in foundries resulted in the occurrence of the phenomenon of the molding mass sintering. Impurities were identified and causes of sintering of a moulding sand based on chromite sand were characterized. Next, research methods enabling a quick evaluation of chromite sand suitability for use in the preparation of moulding sands were selected.

The Effect of Cable Material Characteristics on Suspendome

2010 ◽  
Vol 156-157 ◽  
pp. 1251-1255 ◽  
Author(s):  
Zhi Hua Chen ◽  
Guo Jun Sun ◽  
Zhan Sheng Liu
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Low Temperature ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Steel Structure ◽  
Linear Expansion Coefficient ◽  
Maximum Displacement ◽  
Material Characteristics ◽  
Prestressed Steel Structure

Cable is the key component in the prestressed steel structure. In order to study the effect of cable elastic modulus and expansion coefficient on the prestressed steel structure, Suspendome of Tianbao Center was taken as the research object and APDL language is applied to write a corresponding program, thereby carrying out analysis to the model; The results indicate that the change of cable expansion coefficient and cable elastic modulus have a different effect on the performance of the suspendome: at high temperature, the effect of the expansion coefficient of hoop cable and radial cable is larger on the maximum displacement; at low temperature, the effect of the elastic modulus of hoop cable is larger on the support constrained force. Therefore, it is necessary to give precise linear expansion coefficient and elastic modulus for different cables.

Determination of thermal expansion of KCaI3 using in-situ high temperature powder X-ray diffraction

2018 ◽  
Vol 212 ◽  
pp. 161-166 ◽  
Author(s):  
Adam C. Lindsey ◽  
Matthew Loyd ◽  
Maulik K. Patel ◽  
Ryan Rawl ◽  
Haidong Zhou ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
X Ray Diffraction ◽  
X Ray

Variation of cation distribution with temperature and its consequences on thermal expansion for Ca3Eu2(BO3)4

2020 ◽  
Vol 76 (4) ◽  
pp. 554-562
Author(s):  
Katarzyna M. Kosyl ◽  
Wojciech Paszkowicz ◽  
Alexey N. Shekhovtsov ◽  
Miron B. Kosmyna ◽  
Jerzy Antonowicz ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
High Resolution ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Constants ◽  
Thermal Expansion Anisotropy ◽  
Structural Details

The structure of calcium europium orthoborate, Ca3Eu2(BO3)4, was determined using high-resolution powder X-ray diffraction data collected at the ID22 beamline (ESRF) under ambient conditions, as well as at high temperature. Rietveld refinement allowed determination of the lattice constants and structural details, including the Ca/Eu ratios at the three cationic sites and their evolution with temperature. Clear thermal expansion anisotropy was found, and slope changes of lattice-constant dependencies on temperature were observed at 923 K. Above this temperature the changes in occupation of the Ca/Eu sites occur, exhibiting a tendency towards a more uniform Eu distribution over the three Ca/Eu sites. Possible structural origins of the observed thermal expansion anisotropy are discussed.

Determination of Thermal Expansion by High-Temperature X-Ray Diffraction

1961 ◽  
Vol 5 ◽  
pp. 238-243 ◽  
Author(s):  
Dale A. Vaughan ◽  
Charles M. Schwartz
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Ceramic Materials ◽  
Lattice Parameter ◽  
Specimen Preparation ◽  
X Ray Diffraction ◽  
X Ray ◽  
And Control ◽  
Measurement And Control

AbstractTwo high-temperature X-ray diffraction cameras are described which have been employed at Battelle to determine thermal expansion of metals and ceramic materials. Specimen preparation and temperature measurement and control are described. Lattice-parameter data vs. temperature are presented for uranium, uranium dioxide, and magnesium oxide.

THE THERMAL EXPANSION OF CUBIC BARIUM TITANATE (BaTiO3) FROM 350 °C TO 1050 °C

1959 ◽  
Vol 37 (4) ◽  
pp. 417-421 ◽  
Author(s):  
J. A. Bland
Keyword(s):  
Thermal Expansion ◽  
Barium Titanate ◽  
Systematic Error ◽  
Expansion Coefficient ◽  
Lattice Spacing ◽  
Linear Expansion ◽  
Linear Expansion Coefficient ◽  
X Ray ◽  
Linear Fashion

The lattice spacing of cubic barium titanate (BaTiO3) has been measured as a function of temperature by means of a Unicam X-ray camera. The relation between a0 (in Å) and t between 350 °C and 1050 °C is:[Formula: see text]The maximum systematic error in a0 is 0.0005 Å. The linear expansion coefficient varies in an approximately linear fashion between 10.8 × 10−6 per °C at 350 °C to 17.5 × 10−6 = per °C at 1050 °C.

Ab initio structure determination of the high-temperature phase of anhydrous caffeine by X-ray powder diffraction

2005 ◽  
Vol 61 (3) ◽  
pp. 329-334 ◽  
Author(s):  
Patrick Derollez ◽  
Natália T. Correia ◽  
Florence Danède ◽  
Frédéric Capet ◽  
Frédéric Affouard ◽  
...  
Keyword(s):  
High Temperature ◽  
Phase I ◽  
Metastable State ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Rietveld Refinements ◽  
X Ray ◽  
Ab Initio Structure

The high-temperature phase I of anhydrous caffeine was obtained by heating and annealing the purified commercial form II at 450 K. This phase I can be maintained at low temperature in a metastable state. A powder X-ray diffraction pattern was recorded at 278 K with a laboratory diffractometer equipped with an INEL curved position-sensitive detector CPS120. Phase I is dynamically orientationally disordered (the so-called plastic phase). The Rietveld refinements were achieved with rigid-body constraints. It was assumed that on each site, a molecule can adopt three preferential orientations with equal occupation probability. Under a deep undercooling of phase I, below 250 K, the metastable state enters in a glassy crystal state.

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