Temperature and composition dependence of birefringence of lithium-tantalate crystals determined by holographic scattering

2003 ◽  
Vol 199 (1) ◽  
pp. R1-R3 ◽  
Author(s):  
K. Bastwöste ◽  
S. Schwalenberg ◽  
Ch. Bäumer ◽  
E. Krätzig
Keyword(s):  
Composition Dependence ◽  
Lithium Tantalate

The ferroelectric phase transition in lithium tantalate single crystals: A composition-dependence study

2008 ◽  
Vol 103 (1) ◽  
pp. 014108 ◽  
Author(s):  
Indranil Bhaumik ◽  
S. Ganesamoorthy ◽  
R. Bhatt ◽  
A. K. Karnal ◽  
V. K. Wadhawan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Ferroelectric Phase Transition ◽  
Composition Dependence ◽  
Ferroelectric Phase ◽  
Lithium Tantalate

Composition dependence of the OH-stretch-mode spectrum in lithium tantalate

2004 ◽  
Vol 201 (4) ◽  
pp. R13-R16 ◽  
Author(s):  
C. B�umer ◽  
C. David ◽  
K. Betzler ◽  
H. Hesse ◽  
K. Lengyel ◽  
...  
Keyword(s):  
Composition Dependence ◽  
Lithium Tantalate ◽  
Mode Spectrum ◽  
Stretch Mode

The composition dependence and new assignment of the Raman spectrum in lithium tantalate

2005 ◽  
Vol 135 (4) ◽  
pp. 251-256 ◽  
Author(s):  
Lihong Shi ◽  
Yongfa Kong ◽  
Wenbo Yan ◽  
Hongde Liu ◽  
Xiaochun Li ◽  
...  
Keyword(s):  
Raman Spectrum ◽  
Composition Dependence ◽  
Lithium Tantalate

Composition dependence of the ultraviolet absorption edge in lithium tantalate

2003 ◽  
Vol 93 (5) ◽  
pp. 3102-3104 ◽  
Author(s):  
Ch. Bäumer ◽  
C. David ◽  
A. Tunyagi ◽  
K. Betzler ◽  
H. Hesse ◽  
...  
Keyword(s):  
Absorption Edge ◽  
Composition Dependence ◽  
Lithium Tantalate ◽  
Ultraviolet Absorption

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.

Selective Flotation of Lithium Tantalate from Green Carborandum

1988 ◽  
Vol 104 (1207) ◽  
pp. 581-586
Author(s):  
Mitsuo MAMIYA ◽  
Toyohisa FUJITA ◽  
Yuezhou WEI
Keyword(s):  
Lithium Tantalate ◽  
Selective Flotation

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.

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