Anomalous composition dependence of anisotropy in amorphous Tb‐Fe and Ho‐Fe (abstract)

1991 ◽  
Vol 69 (8) ◽  
pp. 5466-5466
Author(s):  
F. Hellman ◽  
E. M. Gyorgy ◽  
R. B. van Dover ◽  
R. J. Felder
Keyword(s):  
Composition Dependence

Epitaxial Growth in Dislocation-Free Strained Alloy Films

2002 ◽  
Vol 715 ◽  
Author(s):  
Zhi-Feng Huang ◽  
Rashmi C. Desai
Keyword(s):  
Deposition Rate ◽  
Elastic Moduli ◽  
Composition Dependence ◽  
Critical Thickness ◽  
Lattice Misfit ◽  
Misfit Strain ◽  
Joint Stability ◽  
Alloy Films ◽  
The Stability ◽  
Stability Results

AbstractThe morphological and compositional instabilities in the heteroepitaxial strained alloy films have attracted intense interest from both experimentalists and theorists. To understand the mechanisms and properties for the generation of instabilities, we have developed a nonequilibrium, continuum model for the dislocation-free and coherent film systems. The early evolution processes of surface pro.les for both growing and postdeposition (non-growing) thin alloy films are studied through a linear stability analysis. We consider the coupling between top surface of the film and the underlying bulk, as well as the combination and interplay of different elastic effects. These e.ects are caused by filmsubstrate lattice misfit, composition dependence of film lattice constant (compositional stress), and composition dependence of both Young's and shear elastic moduli. The interplay of these factors as well as the growth temperature and deposition rate leads to rich and complicated stability results. For both the growing.lm and non-growing alloy free surface, we determine the stability conditions and diagrams for the system. These show the joint stability or instability for film morphology and compositional pro.les, as well as the asymmetry between tensile and compressive layers. The kinetic critical thickness for the onset of instability during.lm growth is also calculated, and its scaling behavior with respect to misfit strain and deposition rate determined. Our results have implications for real alloy growth systems such as SiGe and InGaAs, which agree with qualitative trends seen in recent experimental observations.

Melting and Crystallization of Poly(oxyethylene) Mixtures

1995 ◽  
Vol 60 (11) ◽  
pp. 1855-1868 ◽  
Author(s):  
Ivo Lapeš ◽  
Josef Baldrian ◽  
Ján Biroš ◽  
Julius Pouchlý ◽  
Hanes Mio
Keyword(s):  
Melting Point ◽  
Lamellar Structure ◽  
Composition Dependence ◽  
Eutectic Phase ◽  
Eutectic Melting ◽  
Pure Polymer ◽  
X Ray ◽  
Long Period ◽  
Solid Liquid ◽  
Melting And Crystallization

Solid-liquid eutectic phase diagrams of mixtures of poly(oxyethylene) (M.w. 2 000) with hydroxy and methoxy endgroups, crystallizing in extended-chain macroconformation only, with glutaric acid, benzoic acid or 1,2-diphenylethane are given. The composition dependence of the melting temperature can be fitted by the Flory-Huggins equation. Interaction parameters X and interaction energy densities B evaluated from the diluent branch of the phase diagram are consistent with those obtained from the polymer branch provided the calorimetric value of enthalpy of polymer fusion is used in the latter computation. Measurements of small- and wide-angle X-ray scatterings showed a stacked lamellar structure of POE. Below the eutectic melting point, the long period of the polymer is almost independent of the diluent concentration. On raising temperature gradually from this melting point to the melting point of pure polymer, the increasing long period indicates the penetration of the diluent between the lamellae. As follows from SAXS measurements, the crystallinity of poly(oxyethylene) in the mixtures remains unchanged compared to that of the pure polymer.

Composition dependence of the DC conductivity in (CuPc) sakap 6 mixtures: Yoshida model application

1991 ◽  
Vol 123 (2) ◽  
pp. K145-K148 ◽  
Author(s):  
R. Piasecki ◽  
Z. Ziembik ◽  
W. Wacławek ◽  
M. Zabkowska-Wacławek
Keyword(s):  
Composition Dependence ◽  
Dc Conductivity ◽  
Model Application

Corrigendum to “Composition dependence of indentation deformation and indentation cracking in glass” [Acta Mater. 61 (2013) 5949-5965]

2021 ◽  
Vol 208 ◽  
pp. 116738
Author(s):  
P. Sellappan ◽  
T. Rouxel ◽  
F. Celarie ◽  
E. Becker ◽  
P. Houizot ◽  
...  
Keyword(s):  
Composition Dependence ◽  
Acta Mater

scholarly journals Predicting the photocurrent-composition dependence in organic solar cells

2021 ◽  
Author(s):  
Xabier Rodríguez-Martínez ◽  
Enrique Pascual San José ◽  
Zhuping Fei ◽  
Martin Heeney ◽  
Roger Guimera ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Photovoltaics ◽  
Organic Solar Cells ◽  
Composition Dependence ◽  
Continuous Development

The continuous development of improved non-fullerene acceptors and deeper knowledge of the fundamental mechanisms governing performance underpin the vertiginous increase in efficiency witnessed by organic photovoltaics. While the influence of...

Composition dependence of physical properties in Pr0.7Ca0.3Mn1−xNixO3

2017 ◽  
Vol 693 ◽  
pp. 631-641 ◽  
Author(s):  
R. Jemai ◽  
R. M'nassri ◽  
A. Selmi ◽  
H. Rahmouni ◽  
K. Khirouni ◽  
...  
Keyword(s):  
Physical Properties ◽  
Composition Dependence

Composition dependence of indentation deformation and indentation cracking in glass

2013 ◽  
Vol 61 (16) ◽  
pp. 5949-5965 ◽  
Author(s):  
P. Sellappan ◽  
T. Rouxel ◽  
F. Celarie ◽  
E. Becker ◽  
P. Houizot ◽  
...  
Keyword(s):  
Composition Dependence

Strain Shift Coefficients for Phonons in Si-Ge Heterostructures

1991 ◽  
Vol 239 ◽  
Author(s):  
J.-M. Baribeau ◽  
D. J. Lockwood
Keyword(s):  
Molecular Beam ◽  
Composition Dependence ◽  
Vibration Mode ◽  
Phonon Frequency ◽  
Longitudinal Optical ◽  
Stress Factor ◽  
Double Crystal ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Shift Coefficient

ABSTRACTStrain shift coefficient measurements for longitudinal optical phonons in molecular beam epitaxy grown metastable pseudomorphic Si1−xGex layers on (100) Si (0 < x < 0.35) and Ge (0.80 < x < 1) are reported. Strain in partially relaxed annealed specimens was obtained by double-crystal x-ray diffractometry and the corresponding strain phonon shift was measured by Raman scattering spectroscopy. For epilayers grown on Si it was found that the epilayer Si-Si phonon frequency varies linearly with strain. The magnitude of the strain shift coefficient b however showed a small composition dependence varying from b ≈ -700 cm-1 at x = 0 to b ≈ -950 cm-1 at x = 0.35, corresponding to a stress factor τ = 0.40 + 0.57x: + 0.13x2 cm-1/kbar. For the Ge-Ge vibration mode in epilayers grown on Ge, b decreased from ∼-425 cm-1 at x = 1 to ∼-500 cm-1 at x = 0.8, corresponding to a stress factor τ ≈ 0.52 – 0.14x - 0.08x2 cm-1/kbar.

Composition dependence of the phase transition and ionic conductivity in BIHFVOX system

2009 ◽  
Vol 479 (1-2) ◽  
pp. 107-112 ◽  
Author(s):  
Saba Beg ◽  
Niyazi A.S. Al-Areqi ◽  
Ahlam Al-Alas
Keyword(s):  
Phase Transition ◽  
Ionic Conductivity ◽  
Composition Dependence
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