scholarly journals Composition and temperature dependences of resistivity of high concentration Mg-Al binary solid solution.

1995 ◽  
Vol 45 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Shin-ya KOMATSU ◽  
Masahiko IKEDA ◽  
Toshihiko IKOMA ◽  
Takeshi USUNAGA ◽  
Toshihiko SHINYA ◽  
...  
Author(s):  
Г.Н. Исаченко ◽  
А.Ю. Самунин ◽  
П.П. Константинов ◽  
А.А. Касьянов ◽  
А. Масалимов

AbstractHigh values of the thermoelectric figure of merit ( ZT = 1.5) in Mg_2Si–Mg_2Sn solid solutions are caused by a low thermal conductivity and a complex band structure, which is optimal at the ratio of solid-solution components of 40% Mg_2Si and 60% Mg_2Sn. However, the presence of magnesium stannide in a high concentration impairs the mechanical properties and chemical stability of the material limiting its application at high temperatures. Magnesium silicide has a higher stability but a lower figure of merit. The figure of merit is much lower in Mg_2Si-rich solid solutions and amounts to ZT ~ 1. The possibility of increasing ZT in the Mg_2Si_0.8Sn_0.2 solid solution with the additional inclusion of Mg_2Ge in small quantities is investigated here. Samples of Mg_2(Si_1 –_ x Ge_ x )_0.8Sn_0.2 ( x < 0.03) solid solution are prepared by hot pressing. The temperature dependences of the coefficients of the thermoelectric power, electrical conductivity, and thermal conductivity are measured in the range of 300–800 K. An increase in the thermoelectric figure of merit to ZT = 1.1 is shown at T = 800 K in the Mg_2Si_0.78Ge_0.02Sn_0.2〈Sb〉 solid solution.


2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Santosh Dubey ◽  
S. K. Joshi ◽  
B. S. Tewari

The stability of a binary solid solution under irradiation has been studied. This has been done by performing linear stability analysis of a set of nonlinear reaction-diffusion equations under uniform irradiation. Owing to the complexity of the resulting system of eigenvalue equations, a numerical solution has been attempted to calculate the dispersion relations. The set of reaction-diffusion equations represent the coupled dynamics of vacancies, dumbbell-type interstitials, and lattice atoms. For a miscible system (Cu-Au) under uniform irradiation, the initiation and growth of the instability have been studied as a function of various control parameters.


1998 ◽  
Vol 13 (5) ◽  
pp. 1327-1334 ◽  
Author(s):  
Srečo Škapin ◽  
Drago Kolar ◽  
Danilo Suvorov ◽  
Zoran Samardžija

Subsolidus phase relations in the BaTiO3–La2TiO5–TiO2 part of the ternary BaO–La2O3–TiO2 system at 1300 °C in air were determined. The phases were characterized by x-ray diffraction, scanning electron microscopy, and electron probe wavelength dispersive spectroscopic microanalysis. A combination of techniques was employed because of insensitivity in detecting secondary phases by x-ray diffraction. The location and extent of Ba6−xLa8+2x/3Ti18O54 ternary solid solution 0.2(1) ⩽ x ⩽ 2.3(1) and Ba1−yLayTi1−y/4 (VTi)y/4O3 binary solid solution 0 ⩽ y ⩽ 0.3 at 1300 °C was established. Tie lines between various barium polytitanates with a sequence of Ba6−xLa8+2x/3Ti18O54 solid solution regions were determined.


1996 ◽  
Vol 10 (08) ◽  
pp. 347-352
Author(s):  
A.L. PHILIPPETIS

In this work we refer to some experimental results related. as we believe, with excitation energy transfer between molecules of the same kind in liquid and solid solutions of high concentration. We try to explain these results by a theoretical interpretation based on the assumption that the “migration of energy” depends on the distance between the molecules, the orientation of these molecules and on a coupling constant related with the type of these molecules.


2003 ◽  
Vol 67 (9) ◽  
pp. 1601-1608 ◽  
Author(s):  
J.M Astilleros ◽  
C.M Pina ◽  
L Fernández-Díaz ◽  
A Putnis

2006 ◽  
Vol 306 (7) ◽  
pp. 553-574 ◽  
Author(s):  
A. G. Shtukenberg ◽  
Y. O. Punin ◽  
P. Azimov

2019 ◽  
Vol 492 ◽  
pp. 165685
Author(s):  
Mehak Shariq ◽  
Shahzad Hussain ◽  
Mohsin Rafique ◽  
M. Naveed-Ul-Haq ◽  
Azizur Rehman

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