Universal character of relaxation of the intensity of light scattering by boron oxide melt in the temperature range 300–340°C

2016 ◽  
Vol 42 (6) ◽  
pp. 525-529 ◽  
Author(s):  
N. A. Bokov
Keyword(s):  
Light Scattering ◽  
Boron Oxide ◽  
Temperature Range ◽  
Oxide Melt

INVESTIGATION OF PECULIARITIES OF LIGHT SCATTERING BY NANOSTRUCTURAL CHANGES IN THE CRYSTAL LATTICE OF FERROELECTRIC BARIUM SODIUM NIOBATE CRYSTAL

2004 ◽  
Vol 03 (06) ◽  
pp. 815-818 ◽  
Author(s):  
S. V. IVANOVA
Keyword(s):  
Light Scattering ◽  
Laser Beam ◽  
Beam Width ◽  
Far Field ◽  
Sodium Niobate ◽  
Incident Laser Beam ◽  
Incident Laser ◽  
Elastic Light Scattering ◽  
Temperature Range ◽  
Thermal Changes

Thermal changes of light scattering images in the far-field were observed under steady illumination by an incident laser beam of finite beam width on barium sodium niobate crystals in the temperature range of 20–500°C. Different patterns of light scattering in far-field were observed — from striped to round-like form with dependence on temperature, conditions of grown, direction of beam and polarization. The round-like form was observed on cooling from 450°C to 240°C. Striped forms of light scattering were observed below 200°C. Correlation of the behavior of elastic light scattering was observed in this temperature range.

scholarly journals An estimate of the enthalpic contribution to the interaction between dextran and albumin

1978 ◽  
Vol 175 (2) ◽  
pp. 703-708 ◽  
Author(s):  
W D Comper ◽  
T C Laurent
Keyword(s):  
Aqueous Solution ◽  
Light Scattering ◽  
Temperature Dependence ◽  
Qualitative Agreement ◽  
Interaction Coefficient ◽  
Enthalpy Of Dilution ◽  
Scattering Data ◽  
Temperature Range ◽  
Considerable Error

It is demonstrated that exclusion phenomena appear to dominate the interaction of dextran with albumin in aqueous solution. The enthalpic contribution to the interaction coefficient describing dextran/albumin mixtures is small, although its determination was subject to considerable error. These results support the earlier assumptions of the type of interaction between the two polymers. The conclusions are primarily based on the interpretation of the temperature-dependence of the interaction coefficient, as measured by light-scattering in the temperature range 6–33 degrees C. Enthalpy of dilution measurements of dextran/albumin mixtures by microcalorimetry were in qualitative agreement with the light-scattering data.

scholarly journals Thermodynamic modeling of isotherms of oxygen solubility in liquid metal of Fe – Mg – Al – O system

2019 ◽  
Vol 62 (8) ◽  
pp. 639-645 ◽  
Author(s):  
G. G. Mikhailov ◽  
O. V. Samoilova ◽  
L. A. Makrovets ◽  
L. A. Smirnov
Keyword(s):  
Solid Solution ◽  
Liquid Metal ◽  
Liquid Iron ◽  
Thermodynamic Modeling ◽  
Equilibrium Constants ◽  
Oxygen Solubility ◽  
Ionic Solutions ◽  
Temperature Range ◽  
Oxide Melt ◽  
Oxide Phases

Studying the interaction between oxygen and magnesium and aluminum dissolved in liquid iron is an important task in order to choose optimal parameters for refining and casting of steels. Relevance of this research is caused by determining the possibility and conditions for formation of unfavorable refractory particles of magnesium oxideand magnesian spinel in a metal melt. In the course of this research, thermodynamic modeling of phase equilibria implemented in liquid metal of such systems as Fe – Mg – O, Fe – Al – O and Fe – Mg – Al – O within the temperature range of 1550 – 1650 °С was carried out. Calculation was made using the technique of constructing the solubility surfaces for the metal components which connects quantitative changes in composition of a liquid metal with qualitative changes in composition of products obtained as a result of interaction of a metallic melt’s components. The modeling method was based not only on usin­g equilibrium constants of reactions occurring between components of the systems under research in the selected temperature range, but also on taking into account the values of interaction parameters of the first order (according to Wagner) of elements in liquid iron. In order to simulate activities of the oxide melt conjugated with the metallic one, approximation of the theory of subregular ionic solutions was used. To model activities of oxides solid solution, approximation of the theory of regular ionic solutions was used. And the theory of ideal ionic solutions was used for the solid solution of spinels. In the course of the work, isotherms of oxygen’s solubility in liquid metal of systems Fe – Mg – O, Fe – Al – O and Fe – Mg – Al – O have been constructed, and regions of thermodynamic stability of oxide phases conjugated with the metallic melt have been determined. In particular, compositions area of a liquid metal which is going to be in equilibrium with the solid solution of spinels | FeAl 2 O 4 , MgAl 2 O 4 | solid solution has been determined for Fe – Mg – Al – O system. Results obtained in the course of thermodynamic modeling have been compared to experimental data.

Thermochemistry of the liquid bismuth(III) oxide – boron oxide: a new solvent for oxide melt solution calorimetry

1995 ◽  
Vol 73 (3) ◽  
pp. 425-430 ◽  
Author(s):  
Jacques Rogez ◽  
Jean Claude Mathieu
Keyword(s):  
High Temperature ◽  
Boron Oxide ◽  
Solution Calorimetry ◽  
Physicochemical Study ◽  
Oxide Melt ◽  
Liquid Bismuth ◽  
High Temperature Oxide ◽  
Temperature Oxide

In solution calorimetry, the choice of solvent is important. Some criteria for this choice for oxide melt solution calorimetry are reviewed. A new solvent is proposed and the corresponding physicochemical study is presented. Some structural interpretations are suggested for these Bi2O3–B2O3 melts. Keywords: thermochemistry, calorimetry, high temperature, oxide melt.

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