ELASTIC PROPERTIES AND DEBYE CHARACTERISTIC TEMPERATURE OF PARTIALLY MELTED YBa2Cu3O7−x SUPERCONDUCTOR

1988 ◽  
Vol 02 (09) ◽  
pp. 1111-1117 ◽  
Author(s):  
D.F. LEE ◽  
K. SALAMA
Keyword(s):  
Debye Temperature ◽  
Elastic Properties ◽  
Elastic Constants ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Characteristic Temperature ◽  
Shear Moduli ◽  
Debye Characteristic Temperature ◽  
Temperature Range ◽  
Free Material

The quasi-isotropic elastic constants are measured in a 85% dense partially melted YBa 2 Cu 3 C 7−x superconductor in the temperature range 80–300 K. The room temperature values of the longitudinal and shear moduli of the void-free material are found to be 168 and 59 GPa respectively, and no decrease in these constants is observed during the transition from normal to superconducting states. The Debye temperature is found to be 426 K which is comparable to that of the tetragonal phase polycrystalline BaTiO 3 (429 K).

CALCULATED STRUCTURAL AND ELASTIC PROPERTIES OF M2InC(M=Sc, Ti, V, Zr, Nb, Hf, Ta)

2008 ◽  
Vol 22 (22) ◽  
pp. 2063-2076 ◽  
Author(s):  
A. BOUHEMADOU
Keyword(s):  
Experimental Data ◽  
Theoretical Prediction ◽  
Ab Initio Calculations ◽  
Sound Velocity ◽  
Elastic Properties ◽  
Elastic Constants ◽  
Finite Strain ◽  
Applied Pressure ◽  
Shear Moduli ◽  
Young’S Moduli

Using ab initio calculations, we have studied the structural and elastic properties of M 2 InC , with M = Sc , Ti , V , Zr , Nb , Hf and Ta . Geometrical optimization of the unit cell is in agreement with the available experimental data. We have observed a quadratic dependence of the lattice parameters versus the applied pressure. The elastic constants are calculated using the static finite strain technique. We derived the bulk and shear moduli, Young's moduli and Poisson's ratio for ideal polycrystalline M 2 InC aggregates. We estimated the Debye temperature of M 2 InC from the average sound velocity. This is the first quantitative theoretical prediction of the elastic properties of Sc 2 InC , Ti 2 InC , V 2 InC , Zr 2 InC , Nb 2 InC , Hf 2 InC and Ta 2 InC compounds, and it still awaits experimental confirmation.

scholarly journals Ultrasonic attenuation in Niobium Oxide(NbO) due to phonon-phonon interaction

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Arvind Kumar Tiwari
Keyword(s):  
Elastic Properties ◽  
Elastic Constants ◽  
Niobium Oxide ◽  
Ultrasonic Attenuation ◽  
Phonon Interaction ◽  
Third Order ◽  
Temperature Range ◽  
Third Order Elastic Constants ◽  
Elastic Mechanism ◽  
Elastic Loss

Ultrasonic attenuation due to phonon-phonon interaction and thermo elastic mechanism have been evaluated in NbO along (110) direction in the temperature range 100-500K. The second and third order elastic constants are also evaluated for the evaluation of ultrasonic attenuation and other associated parameters. The ultrasonic attenuation due to phonon-phonon interaction is predominant over thermo elastic loss in this material. The results are discussed in correlation with thermo elastic properties of NbO.

Crystal structure, dielectric, piezoelectric and elastic properties of (±)-tris(ethylenediamine)cobalt(III) nitrate, (±)–[Co(H2N(CH2)2NH2)3](NO3)3

1998 ◽  
Vol 213 (3) ◽  
Author(s):  
S. Haussühl ◽  
J. Schreuer
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Single Crystals ◽  
Elastic Properties ◽  
Structure Analysis ◽  
Elastic Constants ◽  
Room Temperature ◽  
Optical Quality ◽  
X Ray

AbstractLarge single crystals of optical quality of (±)-tris(ethylenediamine)cobalt(III) nitrate have been grown from aequeous solutions. An X-ray structure analysis yielded space groupPyroelectric, dieletric, piezoelectric and elastic constants have been determined at room temperature. Additionally, we have studied the coefficients of thermal expansion and the thermoelastic constants in the range between 270 K and 350 K. The structure exhibits a nearly trigonal symmetry around the [unk]

scholarly journals Investigation of Elastic Properties of the Single-Crystal Nickel-Base Superalloy CMSX-4 in the Temperature Interval between Room Temperature and 1300 °C

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 152
Author(s):  
Alexander Epishin ◽  
Bernard Fedelich ◽  
Monika Finn ◽  
Georgia Künecke ◽  
Birgit Rehmer ◽  
...  
Keyword(s):  
Single Crystal ◽  
Elastic Properties ◽  
Temperature Interval ◽  
Elastic Constants ◽  
Gas Turbines ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Resonance Frequencies ◽  
Nickel Base ◽  
Base Superalloy

The elastic properties of the single-crystal nickel-base superalloy CMSX-4 used as a blade material in gas turbines were investigated by the sonic resonance method in the temperature interval between room temperature and 1300 °C. Elastic constants at such high temperatures are needed to model the mechanical behavior of blade material during manufacturing (hot isostatic pressing) as well as during technical accidents which may happen in service (overheating). High reliability of the results was achieved using specimens of different crystallographic orientations, exciting various vibration modes as well as precise measurement of the material density and thermal expansion required for modeling the resonance frequencies by finite element method. Combining the results measured in this work and literature data the elastic constants of the γ- and γ′-phases were predicted. This prediction was supported by measurement of the temperature dependence of the γ′-fraction. All data obtained in this work are given in numerical or analytical forms and can be easily used for different scientific and engineering calculations.

scholarly journals Elastic Behavior of γ-Li3N under Pressure

2011 ◽  
Vol 3 (3) ◽  
pp. 569-574
Author(s):  
M. A. Hossain ◽  
A. K. M. A. Islam
Keyword(s):  
Debye Temperature ◽  
Elastic Properties ◽  
Elastic Constants ◽  
First Principles ◽  
Elastic Moduli ◽  
Gamma Transition ◽  
Elastic Behavior ◽  
Gamma Phase ◽  
First Time ◽  
First Principles Method

The elastic properties of gamma-Li3N have been studied for the first time by first-principles method. Three independent elastic constants, aggregate elastic moduli (B, G, E), Poisson’s ratio and Debye temperature are calculated as a function of pressure from 37.12 (beta to gamma transition value)  to 200 GPa and the implications of the results are discussed.Keywords: Li3N; Gamma-phase; Elastic properties; Debye temperature.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi:10.3329/jsr.v3i3.7832               J. Sci. Res. 3 (3), 579-584 (2011)

Room temperature elastic constants and Debye temperature of PdPb2

1984 ◽  
Vol 56 (10) ◽  
pp. 3018-3019 ◽  
Author(s):  
B. K. Basu ◽  
K. Samudravijaya ◽  
A. K. Nigam
Keyword(s):  
Debye Temperature ◽  
Elastic Constants ◽  
Room Temperature

MECHANICAL AND THERMAL PROPERTIES OF PRASEODYMIUM MONOPNICTIDES: AN ULTRASONIC STUDY

2013 ◽  
Vol 27 (22) ◽  
pp. 1350116 ◽  
Author(s):  
VYOMA BHALLA ◽  
RAJ KUMAR ◽  
CHINMAYEE TRIPATHY ◽  
DEVRAJ SINGH
Keyword(s):  
Elastic Constants ◽  
Room Temperature ◽  
Ultrasonic Attenuation ◽  
Poisson Ratio ◽  
Higher Order ◽  
Coupling Constants ◽  
Nonlinearity Parameter ◽  
Mechanical And Thermal Properties ◽  
Temperature Range ◽  
G Ratio

We have computed ultrasonic attenuation, acoustic coupling constants and ultrasonic velocities of praseodymium monopnictides PrX ( X : N , P , As , Sb and Bi ) along the 〈100〉, 〈110〉, 〈111〉 in the temperature range 100–500 K using higher order elastic constants. The higher order elastic constants are evaluated using Coulomb and Born–Mayer potential with two basic parameters viz. nearest-neighbor distance and hardness parameter in the temperature range of 0–500 K. Several other mechanical and thermal parameters like bulk modulus, shear modulus, Young's modulus, Poisson ratio, anisotropic ratio, tetragonal moduli, Breazeale's nonlinearity parameter and Debye temperature are also calculated. In the present study, the fracture/toughness (B/G) ratio is less than 1.75 which implies that PrX compounds are brittle in nature at room temperature. The chosen material fulfilled Born criterion of mechanical stability. We also found the deviation of Cauchy's relation at higher temperatures. PrN is most stable material as it has highest valued higher order elastic constants as well as the ultrasonic velocity. Further, the lattice thermal conductivity using modified approach of Slack and Berman is determined at room temperature. The ultrasonic attenuation due to phonon–phonon interaction and thermoelastic relaxation mechanisms have been computed using modified Mason's approach. The results with other well-known physical properties are useful for industrial applications.

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