Elastic properties and phonon conductivities of Ti3Al(C0.5,N0.5)2 and Ti2Al(C0.5,N0.5) solid solutions

2008 ◽  
Vol 23 (6) ◽  
pp. 1517-1521 ◽  
Author(s):  
M. Radovic ◽  
A. Ganguly ◽  
M.W. Barsoum
Keyword(s):  
Elastic Properties ◽  
Solid Solutions ◽  
Room Temperature ◽  
Elastic Moduli ◽  
Unit Cell ◽  
Young’S Moduli ◽  
Temperature Shear ◽  
End Members ◽  
Cell Volumes ◽  
Thermal Conductivities

Herein we compare the lattice parameters, room temperature shear and Young’s moduli, and phonon thermal conductivities of Ti2AlC0.5N0.5 and Ti3Al(C0.5, N0.5)2 solid solutions with those of their end members, namely Ti2AlC, Ti2AlN, Ti3AlC2, and Ti4AlN2.9. In general, the replacement of C by N decreases the unit cell volumes and increases the elastic moduli and phonon thermal conductivities. The increase in the latter two properties, however, is sensitive to the concentrations of defects, most likely vacancies on one or more of the sublattices.

scholarly journals The solid solutions of rebulite and jankovićite in the phase system Tl2S-As2S3-Sb2S3

2015 ◽  
Vol 34 (1) ◽  
pp. 125
Author(s):  
Tonci Balic-Zunic ◽  
Yves Moëlo ◽  
Ljiljana Karanović ◽  
Peter Berlepsch
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Solid Solutions ◽  
Unit Cell ◽  
Phase System ◽  
Structural Topology ◽  
Coordination Polyhedra ◽  
Ideal Composition ◽  
End Members ◽  
Compositional Line

Syntheses along the Tl<sub>5</sub>(As,Sb)<sub>13</sub>S<sub>22</sub> compositional line in the Tl<sub>2</sub>S-As<sub>2</sub>S<sub>3</sub>-Sb<sub>2</sub>S<sub>3</sub> phase system showed that the compositional range of rebulite extends from  Tl<sub>5</sub>As<sub>9.5</sub>Sb<sub>3.5</sub>S<sub>22</sub> to Tl<sub>5</sub>As<sub>7.75</sub>Sb<sub>5.25</sub>S<sub>22</sub>. The Sb-rich end-member is in equilibrium with jankovićite of ideal composition Tl<sub>5</sub>Sb<sub>7.5</sub>As<sub>5.5</sub>S<sub>22</sub>. It is considered to be the As-rich end-member of the jankovićite solid solution. The crystal structure analyses of crystals from the As and Sb end-members of rebulite show that the Sb/As substitution is present in Sb3, Sb4, Sb5, As1 and As2 structural sites. Of them, Sb3 is always Sb dominated whereas other four vary from As- to Sb-dominated over the range of the solid solution. The change of the structural topology from jankovićite to rebulite, the closely related but not identical structures, is explained through necessity to accommodate the smaller volumes of the As coordination polyhedra and is accomplished through unit-cell twinning over the periodic (001)<sub>reb</sub> twin boundaries. The As end-member of the rebulite solid solution is in equilibrium with the phase of Tl<sub>2.4</sub>Sb<sub>0.68</sub>As<sub>7.18</sub>S<sub>13</sub> ideal composition, interpreted as imhofite.

Elastic Properties of Vanadium Doped Silica-Borotellurite Glasses

2020 ◽  
Vol 307 ◽  
pp. 321-326
Author(s):  
Nurhayati Mohd Nor ◽  
Halimah Mohamed Kamari ◽  
Amirah Abdul Latif ◽  
Nurisya Mohd Shah
Keyword(s):  
Elastic Properties ◽  
Room Temperature ◽  
Elastic Moduli ◽  
Molar Fraction ◽  
Glass Network ◽  
Ultrasonic Pulse ◽  
Ultrasonic Velocities ◽  
Wave Velocities ◽  
Network Glass ◽  
Pulse Echo

Silica borotellurite glasses doped with different molar fraction of V2O5 have been prepared by melt quenching technique. The elastic properties of {[(TeO2)0.7 (B2O3)0.3]0.8(SiO2)0.2}(1-x)(V2O5)x glasses are investigated using ultrasonic pulse echo measurements and their elastic properties have been characterized at room temperature. The density of the glasses was measured by Archimedes method using distilled water as buoyant liquid. The ultrasonic wave velocities (longitudinal, vl and shear, vS) were recorded at 5 MHz. Elastic moduli, Poisson’s ratio (σ) and microhardness (H) were then calculated to obtain quantitative analysis regarding the structure of these glasses. The results obtained showed that the doping of V2O5 with silica borotellurite enhances the strengthening of glass network. Glass with 0.03 molar fraction of V205 shows low ultrasonic velocities and low elastic moduli. The variation of elastic properties is related to the change of structure in the vanadium doped silica-borotellurite glass system.

Elastic Properties of Solid Solutions with Intermediate Valence Sm1-xYxS

2015 ◽  
Vol 770 ◽  
pp. 137-143
Author(s):  
E.G. Soboleva ◽  
A.L. Igisheva ◽  
T.B. Krit
Keyword(s):  
Elasticity Theory ◽  
Elastic Properties ◽  
Solid Solutions ◽  
Elastic Moduli ◽  
Intermediate Valence ◽  
Elastic Parameters ◽  
Valence Transition ◽  
The Given ◽  
Poisson's Ratios ◽  
Poisson’S Ratios

The given article considers acoustic analogues of elasticity theory ratios determining Poisson’s ratios of Sm1-xYxS alloy by their elastic parameters. The article discusses behavior of sound velocities, elastic moduli, Poisson’s ratios, Grüneisen parameter and brittleness-plasticity criterion ratios depending on the concentration of alloy components including valence transition from semiconductors into the metal phase.

Elastic Behavior of YMnO3 and ErMnO3 Manganites

2003 ◽  
Vol 17 (20n21) ◽  
pp. 1119-1125 ◽  
Author(s):  
M. Chandra Sekhar ◽  
K. Padmavathi ◽  
J. G. Park ◽  
P. Venugopal Reddy
Keyword(s):  
Room Temperature ◽  
Elastic Moduli ◽  
Solid State Reaction Method ◽  
Elastic Behavior ◽  
Velocity Measurements ◽  
Qualitative Explanation ◽  
Reaction Method ◽  
X Ray ◽  
Young’S Moduli ◽  
Ray Density

The manganite oxides, YMnO 3 and ErMnO 3 having hexagonal structures were prepared by the solid state reaction method. After characterizing these materials by studying their various physical properties such as lattice parameters, X-ray density, bulk density etc., ultrasonic velocity measurements were carried out over a temperature range 80–300 K to investigate their elastic behavior. As the materials are porous, the measured elastic moduli were corrected to zero porosity. Using the room temperature elastic moduli, Debye temperature values of both the manganites have also been obtained. Surprisingly it has been found that the Young's moduli of both the materials increase continuously with decreasing temperature. A qualitative explanation for the observed behavior is offered.

Monazite end members and solid solutions: synthesis, unit-cell characteristics, and utilization as microprobe standards

1989 ◽  
Vol 53 (369) ◽  
pp. 120-123 ◽  
Author(s):  
J. M. Montel ◽  
F. Lhote ◽  
J. M. Claude
Keyword(s):  
Solid Solution ◽  
Experimental Study ◽  
Solid Solutions ◽  
Unit Cell ◽  
Solid Solution Series ◽  
Solution Series ◽  
End Members ◽  
Characteristics And Utilization

The synthesis of monazite was first reported by Radominsky (1875). Since then various methods have been used to synthesize various end members of the monazite solid solution series, mainly CePO4 and LaPO4 (e.g. Anthony, 1957, 1965). As part of an experimental study dealing with the solubility of monazite in granitic melts (Montel, 1986, 1987, and in prep.), the synthesis of some of the end members, as well as solid solutions, was achieved.

Cell volumes of LaPO4–CePO4 solid solutions

1987 ◽  
Vol 20 (4) ◽  
pp. 319-320 ◽  
Author(s):  
R. S. de Biasi ◽  
A. A. R. Fernandes ◽  
J. C. S. Oliveira
Keyword(s):  
Cell Volume ◽  
Solid Solutions ◽  
Unit Cell Volume ◽  
Unit Cell ◽  
Cube Root ◽  
Lattice Constants ◽  
Vegard’S Law ◽  
Cell Volumes

Lattice constants have been determined for solid solutions of the form La x Ce1−x PO4. A plot of the cube root of the unit-cell volume as a function of x shows that this system follows Végard's law.

Complex Impedance Analyses of Ba1-xLi0.5xBi0.5xTiO3 Solid Solution PTCR Ceramics

2015 ◽  
Vol 230 ◽  
pp. 211-216 ◽  
Author(s):  
Tatiana Plutenko ◽  
Oleg V'yunov ◽  
Dmytro Plutenko ◽  
Anatolii Belous ◽  
Darko Makovec
Keyword(s):  
Solid Solutions ◽  
Room Temperature ◽  
Complex Impedance ◽  
Diffraction Method ◽  
Unit Cell ◽  
Impedance Method ◽  
Positive Temperature ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Ptcr Effect

Conditions for the formation of (1-x)BaTiO3–xLi0.5Bi0.5TiO3 (0 ≤ x ≤0.6) solid solutions with positive temperature coefficient of resistance (PTCR) effect were studied. Solid solutions were prepared by solid state reaction technique. Samples were sintered under reducing atmosphere N2/H2 in the temperature range 1200–1450 °C with subsequent oxidation in air. The phase composition was investigated by X-ray powder diffraction method. It was found that samples of (1-x)BaTiO3–xLi0.5Bi0.5TiO3 (0 ≤ x ≤0.6) solid solutions at room temperature exhibit perovskite structure. Unit cell parameters of unstable at the room temperature compound Li0.5Bi0.5TiO3 were determined by extrapolation of concentration dependence of the unit cell parameters in the (1-x)BaTiO3–xLi0.5Bi0.5TiO3 system. It was shown that minimum value of resistivity ρmin rises with increase in x value. Complex impedance method shown that ceramic grains of (1-x)BaTiO3–xLi0.5Bi0.5TiO3 materials consist of three areas with different electrical properties. Boundary and outerlayer region of grains make the main contribution to the PTCR effect in lithium-containing solid solutions. It was shown that magnitude of the potential barrier's decreases with increasing x.

Elastic properties of (PbySn1−y )2P2S6 solid solutions

Open Physics ◽  
2014 ◽  
Vol 12 (9) ◽  
Author(s):  
Rostyslav Bilanych ◽  
Ruslan Yevych ◽  
Anton Kohutych ◽  
Sergij Perechinskii ◽  
Ivan Stoika ◽  
...  
Keyword(s):  
Debye Temperature ◽  
Elastic Properties ◽  
Solid Solutions ◽  
Chemical Bonding ◽  
Room Temperature ◽  
Brillouin Scattering ◽  
Stiffness Tensor ◽  
Volume Compressibility ◽  
Scattering Technique ◽  
Sound Velocities

AbstractElastic properties of (PbySn1−y )2P2S6 solid solutions were studied using Brillouin scattering technique. Different scattering geometries were used for sound velocities determination that make it possible to find all components of the stiffness tensor. The concentration dependencies of volume compressibility, the Grüneisen parameter and Debye temperature were investigated. The results obtained were used to analyze chemical bonding with substitution of tin by lead at room temperature in the crystals under consideration.

Thermal expansion of cancrinite

1996 ◽  
Vol 60 (403) ◽  
pp. 949-956 ◽  
Author(s):  
Ishmael Hassan
Keyword(s):  
Thermal Expansion ◽  
Room Temperature ◽  
Unit Cell ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Temperature Range ◽  
Thermal Expansion Coefficients ◽  
Expansion Mechanism ◽  
Expansion Coefficients ◽  
Cell Volumes

AbstractThermal expansion coefficients were measured for a cancrinite from Bancroft, Ontario, Canada. Measurements of cell parameters and unit-cell volumes were obtained at room temperature and at heating intervals of 50°C over the temperature range from 50 to 1400°C. The unit-cell parameters for cancrinite increase non-linearly with temperature up to 1200°C and shortly thereafter, the mineral melted. The c parameter increases more rapidly than the a parameter, and the c/a ratio increases linearly with temperature. A plausible thermal expansion mechanism for cancrinite, which is based on the framework expansion that occurs as a function of cavity content, is presented. In the thermal expansion of cancrinite, the short Na-H2O in the H2O-Na—H2O chain expands to form equal distances to the two H2O molecules in the chain. This causes the Na atoms to move towards the plane of the six-membered rings and forces the tetrahedra to rotate and the rings become more planar. The Na atoms then form bonds to all six (O1 and O2) oxygen atoms in a ring; the Na-O1 bonds become shorter and the Na-O2 bonds become longer. These effects cause an increase in both a and c, and thus an increase in the c/a ratio. A similar thermal expansion mechanism operates in the sodalite-group minerals where the six-membered rings and Na-Cl bond are involved.

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