Order—Disorder Phenomena. III. Effect of Temperature and Pressure on the Elastic Constants of Ammonium Chloride

1966 ◽  
Vol 44 (3) ◽  
pp. 1130-1139 ◽  
Author(s):  
Carl W. Garland ◽  
Rémi Renard
Keyword(s):  
Ammonium Chloride ◽  
Elastic Constants ◽  
Effect Of Temperature ◽  
Temperature And Pressure

scholarly journals Structural Stability, Electronic, Mechanical, Phonon, and Thermodynamic Properties of the M2GaC (M = Zr, Hf) MAX Phase: An ab Initio Calculation

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5148
Author(s):  
Muhammad Waqas Qureshi ◽  
Xinxin Ma ◽  
Guangze Tang ◽  
Ramesh Paudel
Keyword(s):  
Thermodynamic Properties ◽  
Ab Initio ◽  
Elastic Constants ◽  
Local Density ◽  
Experimental Studies ◽  
Debye Model ◽  
Max Phase ◽  
Effect Of Temperature ◽  
Max Phases ◽  
Temperature And Pressure

The novel ternary carbides and nitrides, known as MAX phase materials with remarkable combined metallic and ceramic properties, offer various engineering and technological applications. Using ab initio calculations based on generalized gradient approximation (GGA), local density approximation (LDA), and the quasiharmonic Debye model; the electronic, structural, elastic, mechanical, and thermodynamic properties of the M2GaC (M = Zr, Hf) MAX phase were investigated. The optimized lattice parameters give the first reference to the upcoming theocratical and experimental studies, while the calculated elastic constants are in excellent agreement with the available data. Moreover, obtained elastic constants revealed that both the Zr2GaC and Hf2GaC MAX phases are brittle. The band structure and density of states analysis showed that these MAX phases are electrical conductors, having strong directional bonding between M-C (M = Zr, Hf) atoms due to M-d and C-p hybridization. Formation and cohesive energies, and phonon calculations showed that Zr2GaC and Hf2GaC MAX phases’ compounds are thermodynamically and dynamically stable and can be synthesized experimentally. Finally, the effect of temperature and pressure on volume, heat capacity, Debye temperature, Grüneisen parameter, and thermal expansion coefficient of M2GaC (M = Zr, Hf) are evaluated using the quasiharmonic Debye model from the nonequilibrium Gibbs function in the temperature and pressure range 0–1600 K and 0–50 GPa respectively.

Effect of temperature and pressure on mixed oxide solid solutions

2020 ◽  
Vol 117 ◽  
pp. 107965
Author(s):  
M.Yu. Petrushina ◽  
E.S. Dedova ◽  
K.V. Yusenko ◽  
A.S. Portnyagin ◽  
E.K. Papynov ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Mixed Oxide ◽  
Effect Of Temperature ◽  
Temperature And Pressure

SOLUBILITY OF ETHYLENE IN WATER. EFFECT OF TEMPERATURE AND PRESSURE

1952 ◽  
Vol 44 (1) ◽  
pp. 211-212 ◽  
Author(s):  
E. J. Bradbury ◽  
Dorothy McNulty ◽  
R. I. Savage ◽  
E. E. McSweeney
Keyword(s):  
Effect Of Temperature ◽  
Water Effect ◽  
Temperature And Pressure

Elastic Constants of Ammonium Chloride near the Lambda Point

1963 ◽  
Vol 39 (11) ◽  
pp. 2874-2880 ◽  
Author(s):  
Carl W. Garland ◽  
Joseph S. Jones
Keyword(s):  
Ammonium Chloride ◽  
Elastic Constants ◽  
Lambda Point

scholarly journals High temperature and pressure effects on the elastic properties of B2 intermetallics AgRE

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Lili Liu ◽  
Xiaozhi Wu ◽  
Weiguo Li ◽  
Rui Wang ◽  
Qing Liu
Keyword(s):  
High Temperature ◽  
Intermetallic Compounds ◽  
Elastic Properties ◽  
Elastic Constants ◽  
Second Order ◽  
Pressure Effects ◽  
High Temperature And Pressure ◽  
Normal Behavior ◽  
Temperature And Pressure ◽  
Temperature And Pressure Effects

AbstractThe high temperature and pressure effects on the elastic properties of the AgRE (RE=Sc, Tm, Er, Dy, Tb) intermetallic compounds with B2 structure have been performed from first principle calculations. For the temperature range 0-1000 K, the second order elastic constants for all the AgRE intermetallic compounds follow a normal behavior: they decrease with increasing temperature. The pressure dependence of the second order elastic constants has been investigated on the basis of the third order elastic constants. Temperature and pressure dependent elastic anisotropic parameters A have been calculated based on the temperature and pressure dependent elastic constants.

The Effect of Temperature and Pressure on Residual Stress in LPCVD Polysilicon Films

1992 ◽  
Vol 276 ◽  
Author(s):  
D-G. Oei ◽  
S. L. McCarthy
Keyword(s):  
Residual Stress ◽  
Deposition Temperature ◽  
Polycrystalline Silicon ◽  
Chemical Vapor ◽  
Effect Of Temperature ◽  
Pressure Chemical ◽  
Polysilicon Films ◽  
Oriented Polycrystalline ◽  
Temperature And Pressure ◽  
Reduced Pressures

ABSTRACTMeasurements of the residual stress in polysilicon films made by Low Pressure Chemical Vapor Deposition (LPCVD) at different deposition pressures and temperatures are reported. The stress behavior of phosphorus (P)-ion implanted/annealed polysilicon films is also reported. Within the temperature range of deposition, 580 °C to 650 °C, the stress vs deposition temperature plot exhibits a transition region in which the stress of the film changes from highly compressive to highly tensile and back to highly compressive as the deposition temperature increases. This behavior was observed in films that were made by the LPCVD process at reduced pressures of 210 and 320 mTORR. At deposition temperatures below 590 °C the deposit is predominantly amorphous, and the film is highly compressive; at temperatures above 610 °C (110) oriented polycrystalline silicon is formed exhibiting high compressive residual stress.

Synergetic effect of temperature and pressure on energetic and structural characteristics of {ZIF-8 + water} molecular spring

Nanoscale ◽  
2015 ◽  
Vol 7 (19) ◽  
pp. 8803-8810 ◽  
Author(s):  
Ya. Grosu ◽  
G. Renaudin ◽  
V. Eroshenko ◽  
J.-M. Nedelec ◽  
J.-P. E. Grolier
Keyword(s):  
Structural Characteristics ◽  
Synergetic Effect ◽  
Effect Of Temperature ◽  
Temperature And Pressure

scholarly journals NEAR HYDRATION OF SINGLY CHARGED MONOATOMIC IONS IN EXTREMELY DILUTED SOLUTIONS: THE EFFECT OF TEMPERATURE AND PRESSURE

2021 ◽  
pp. 24-31
Author(s):  
Viktor Ivanovych Булавин ◽  
Ivan Nikolajevych V’unik ◽  
Andrii Viktorovych Kramarenko ◽  
Alexandr Ivanovych Rusinov
Keyword(s):  
Ion Solvation ◽  
Effect Of Temperature ◽  
Temperature Growth ◽  
Translational Displacement ◽  
Na Ions ◽  
Extremely Diluted Solutions ◽  
Temperature And Pressure ◽  
Singly Charged ◽  
Direction Opposite ◽  
Structure Breaking

The diffusion coefficient  and the distance of translational displacement of Li+, Na+ K+, Cs+, Cl– and Br– ions  in water at 298.15 K – 423.15 K (25 K step) and pressure from 0.0981 to 784.5 MPa (98.1 MPa step) were calculated from the literature data on limiting molar electrical conductivity. The  values for these ions increase with pressure growth from 0.0981  to 98.1 MPa at 298.15 K. Further pressure increase (up to 785 MPa) leads to decrease in . Temperature growth under isobaric conditions leads to an increase in . Parameter (– ri) (deviation from the Stokes–Einstein law, ri is ion structural radius) was used as a criterion for the type of ion solvation. It is shown that Li+ and Na+ ions behave as cosmotropes, or positively solvated structure–forming ions having (– ri) > 0. The Cs+, Cl–, Br– ions behave as chaotropes, or negatively solvated structure–breaking ions having (– ri) < 0. For the K+ ion, the (– ri) deviation is alternating. At 0.0981 MPa and 298.15 K, the K+ ion is a chaotrope. But at 320 K (Tlim) parameter (– ri) = 0. It corresponds to the transition from negative to positive solvation. Above Tlim at P = const, the K+ ion is a cosmotrope. At 298.15 K and up to 98.1 MPa, the pressure causes the same change in the (– ri) deviation as the temperature. On the contrary, at 320 K and higher, the pressure affects the near hydration in the direction opposite to the temperature.

Sign in / Sign up

Export Citation Format

Share Document