Linear thermal expansion coefficient determination using in situ curvature and temperature dependent X-ray diffraction measurements applied to metalorganic vapor phase epitaxy-grown AlGaAs

2013 ◽  
Vol 114 (3) ◽  
pp. 033501 ◽  
Author(s):  
A. Maaßdorf ◽  
U. Zeimer ◽  
J. Grenzer ◽  
M. Weyers
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Vapor Phase ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray

Thermal expansion coefficient of carbon-supported Pt nanoparticles: In-situ X-ray diffraction study

2017 ◽  
Vol 254 (5) ◽  
pp. 1600695 ◽  
Author(s):  
I. N. Leontyev ◽  
A. A. Kulbakov ◽  
M. Allix ◽  
A. Rakhmatullin ◽  
A. B. Kuriganova ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Diffraction Study ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Pt Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray

Negative Thermal Expansion of Gd2Fe16.5Cr0.5 Compound with Th2Ni17-Type Structure

2011 ◽  
Vol 299-300 ◽  
pp. 47-50
Author(s):  
Yan Ming Hao ◽  
Fei Fei Liang ◽  
Xiao Hong He ◽  
Wu Yan Zhao ◽  
Yue Ting Qin ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Curie Temperature ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Type Structure ◽  
X Ray Diffraction ◽  
Temperature Range

The thermal expansion and the Curie temperature of Gd2Fe16.5Cr0.5 compound have been investigated by means of x-ray diffraction and magnetization measurements. The result shows that the Gd2Fe16.5Cr0.5 compound annealed at 1243°C has a hexagonal Th2Ni17-type structure. Cr atom substituting for Fe atom can increase the Curie temperature obviously. In magnetic state, an anisotropic anomolous thermal expansion was observed. Along the c-axis, the average linear thermal expansion coefficient αc=-2.79×10-6/K in the temperature range 294-472K, and αc =-3.09×10-5/K in 472-592K. Along the a-axis, the average linear thermal expansion coefficient αa =9.22×10-6/K in 294-552K, and αa =-1.41×10-5/K in 552-592K. In the temperature range 472-592K, the average volume thermal expansion coefficient αv =-2.14×10-5/K. The mechanism of the thermal expansion anomaly of Gd2Fe16.5Cr0.5 compound was discussed in this paper.

Phase transition and thermal expansion coefficient of leucite ceramics with addition of SiO2

2009 ◽  
Vol 24 (6) ◽  
pp. 1989-1993 ◽  
Author(s):  
Juan Paulo Wiff ◽  
Yoshiaki Kinemuchi ◽  
Shimako Naito ◽  
Ayako Uozumi ◽  
Koji Watari
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Intermediate Phase ◽  
Linear Thermal Expansion ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After

In this work, the influence of SiO2 additions in leucite ceramics on the bulk linear thermal expansion coefficient (TEC) especially during the phase transition, has been studied. Thermal expansion and x-ray diffraction measurements at high temperatures were carried out to characterize the tetragonal-cubic phase transition. TEC for reference and SiO2-added leucite samples exhibited similar behavior as a function of temperature. Before and after the phase transition, the TEC values were similar to those observed in non-SiO2-added samples, whereas during the phase transition, a maximum TEC value was observed and it tends to decrease as the SiO2 addition increases. This behavior could be caused by the formation of an intermediate phase with an extremely high TEC (70 × 10–6 °C−1) during the phase transformation. Furthermore, the results suggest that as the intermediate phase is partially suppressed via SiO2 addition, the cubic phase can be partially stabilized at temperatures as low as 200 °C.

scholarly journals Effect of Thermal Stresses Formed during Air Annealing of Amorphous Lanthanum Cuprate Thin Films Deposited on Silicon Substrate

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 613 ◽  
Author(s):  
Nolwenn Tranvouez ◽  
Philippe Steyer ◽  
Annie Malchère ◽  
Pascal Boulet ◽  
Fabien Capon ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Thermal Stresses ◽  
Environmental Scanning Electron Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lift Off

Amorphous thin films of La–Cu–O deposited by magnetron sputtering have been annealed at different temperatures and in situ analyzed by X-ray diffraction. These experiments were useful to determine the crystallization temperature and to follow the crystallization process of the film. The in situ annealing X-ray diffraction analyses have been also used to determine the thermal expansion coefficient of La2CuO4 thin film. The estimated value is close to that obtained for a commercial powder. The thermal expansion coefficient value with additional environmental scanning electron microscopy observations explains the delamination origin that occurs during the annealing before the crystallization step. The buckling and delamination of the film observed is caused by the thermal expansion coefficient mismatch of the film and the substrate. During the heating step, the mismatch generates compressive stress at the film/substrate interface, causing the film to lift off and crack in the typical way.

Temperature-driven directional coalescence of silver nanoparticles

2016 ◽  
Vol 23 (3) ◽  
pp. 718-728 ◽  
Author(s):  
Shi Yan ◽  
Dongbai Sun ◽  
Yu Gong ◽  
Yuanyuan Tan ◽  
Xueqing Xing ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Silver Nanoparticles ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Temperature Dependent ◽  
X Ray ◽  
Nanoparticle Growth

Silver nanoparticles were synthesized with a chemical reduction method in the presence of polyvinylpyrrolidone as stabilizing agent. The thermal stability behavior of the silver nanoparticles was studied in the temperature range from 25 to 700°C. Thermal gravimetric analysis was used to measure the weight loss of the silver nanoparticles. Scanning electron microscopy and high-resolution transmission electron microscopy were used to observe the morphology and the change in shape of the silver nanoparticles.In situtemperature-dependent small-angle X-ray scattering was used to detect the increase in particle size with temperature.In situtemperature-dependent X-ray diffraction was used to characterize the increase in nanocrystal size and the thermal expansion coefficient. The results demonstrate that sequential slow and fast Ostward ripening are the main methods of nanoparticle growth at lower temperatures (<500°C), whereas successive random and directional coalescences are the main methods of nanoparticle growth at higher temperatures (>500°C). A four-stage model can be used to describe the whole sintering process. The thermal expansion coefficient (2.8 × 10−5 K−1) of silver nanoparticles is about 30% larger than that of bulk silver. To our knowledge, the temperature-driven directional coalescence of silver nanocrystals is reported for the first time. Two possible mechanisms of directional coalescence have been proposed. This study is of importance not only in terms of its fundamental academic interest but also in terms of the thermal stability of silver nanoparticles.

Negative Thermal Expansion of Tm2Fe15SiCr Compound

2011 ◽  
Vol 311-313 ◽  
pp. 764-767 ◽  
Author(s):  
Fei Fei Liang ◽  
Yan Ming Hao ◽  
Yan Zhao Wu
Keyword(s):  
Thermal Expansion ◽  
Curie Temperature ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Negative Thermal Expansion ◽  
X Ray Diffraction ◽  
Average Volume ◽  
Temperature Range

The thermal expansion and the Curie temperature of Tm2Fe15SiCr compound have been investigated by means of x-ray diffraction and magnetization measurements. The result shows that the Tm2Fe15SiCr compound has a hexagonal Th2Ni17-type structure. One Cr and one Si atoms substituting for two Fe atoms can increase the Curie temperature obviously. In magnetic state, an anisotropic anomalous thermal expansion was observed. Along the c-axis, the average linear thermal expansion coefficient αc=-2.04×10-5/K in the temperature range 303-460K. Along the a-axis, the average linear thermal expansion coefficient αa=-8.09×10-5/K in 370-410K. In the temperature range 370-450K, the average volume thermal expansion coefficient αv =-2.08×10-5/K. The mechanism of the thermal expansion anomaly of Tm2Fe15SiCr compound was discussed in this paper.

scholarly journals Thermal Expansion of Triaxially Stressed Mudstone at Elevated Temperatures up to 400°C

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zi-jun Feng ◽  
Meng-meng Qiao ◽  
Fu-ke Dong ◽  
Dong Yang ◽  
Peng Zhao
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Coal Gasification ◽  
Elevated Temperatures ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Underground Coal Gasification ◽  
Machine Model

In order to study the thermal deformation of the rock that surrounds underground engineering projects with elevated temperatures (e.g., underground coal gasification, coal in situ pyrolysis, in situ oil and gas extraction from oil shale, geothermal energy extraction from rock, among others), a servocontrolled machine (model IMT-HTP 100F) was used to examine the thermal expansion of triaxially stressed mudstone at temperature up to 400°C. Two distinct stages of thermal expansion were found at temperatures up to 400°C: very small thermal expansion below 50°C, followed by almost constant thermal expansion at 50–400°C. This linear thermal expansion coefficient of triaxially stressed mudstone did not increase in the range 50–400°C. The effect of the applied triaxial stress was on both close cracks and impeded grain expansion and the swelling of the rock. Mudstone had a larger linear thermal expansion coefficient than either sandstone or limestone, in that order. The potential energy theory was used to explain the intrinsic variation of thermal expansion of the different rock types.

Graphite thermal expansion coefficient measured by in-situ x-ray diffraction

2020 ◽  
Vol 31 (28) ◽  
pp. 285709
Author(s):  
Monis Abdulmanan Abdullah ◽  
Thar Mohammed Badri Albarody ◽  
Alaa Raad Hussein
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Thermal Properties of Stabilized Zirconia at Low Temperatures

1985 ◽  
Vol 38 (4) ◽  
pp. 617 ◽  
Author(s):  
JG Collins ◽  
SJ Collocott ◽  
GK White
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Low Temperatures ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Stabilized Zirconia ◽  
Elastic Data

The linear thermal expansion coefficient a from 2 to 100 K and heat capacity per gram cp from 0�3 to 30 K are reported for fully-stabilized zirconia containing a nominal 16 wt.% (9 mol.%) of yttria. The heat capacity below 7 K has been analysed into a linear (tunnelling?) term, a Schottky term centred at 1�2 K, a Debye term (e~ = 540 K), and a small T5 contribution. The expansion coefficient is roughly proportional to T from 5 to 20 K and gives a limiting lattice Griineisen parameter 'Yo ::::: 5, which agrees with that calculated from elastic data.

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