Phase-Separation Phenomena in Glasses / Likvatsionnye Yavleniya v Steklakh / Ликвационные Явления в Стеклах, 1973 Proceedings of the first All-Union Symposium on Phase-Separation Phenomena in Glasses, Leningrad, April 16-18, 1968 The Structure of Glass Series

The First All-Union Symposium on Phase-Separation Phenomena in Glasses was held in Lenin­ grad from April 16 to 18, 1968. The symposium was organized by the Section of the structure of glass and the nature of the glassy state of the Scientific Council for the problem "New Tech­ nical Materials and Coatings Based on Glass and Refractory Compounds" of the State Committee for Science and Technology of the Council of Ministers of the USSR, by the Scientific Council for the problem "Physicochemical Principles of Production of New Heat-Resistant Inorganic Mate­ rials" of the Division of Physical Chemistry and Technology of Inorganic Materials, Academy of Sciences of the USSR, by the Leningrad regional board of the D. 1. Mendeleev All-Union Chemi­ cal Society, and by the 1. V. Grebenshchikov Institute of Silicate Chemistry, Academy of Sciences of the USSR. The present collection consists of the Proceedings of the Symposium and is No. 3 in Vol. 5 of the series "The Glassy State," published by the Academy of Sciences of the USSR since 1955. The book contains the results of theoretical and experimental investigations of phase sep­ aration of glasses into two glassy phases, and of the influence of this submicroscopically heter­ ogeneous structure on certain properties of glass. Metastable phase separation in glasses was discovered about 10 years ago.

Opening of the Symposium.- Introductory Address.- I. General Aspects of Phase Separation in Glasses.- Causes of Phase Separation in Simple Silicate Systems.- Theory of Phase Separation and Atomic-Ionic Structure of Certain Two-Component Systems.- Some Thermodynamic Aspects of Phase-Separation Phenomena.- Primary and Secondary Phase Separation in Glasses.- Investigation of the Physical and Chemical Properties of Glasses Undergoing Phase Separation as a Method of Studying Their Structure.- Influence of Structural Heterogeneity on Physical and Chemical Properties of Glasses.- Determination of the Nucleation Rate of New Phases in Glasses at the Initial Stages of Phase Conversion.- Surface-Active Properties of Catalysts and Phase Separation in Glasses.- Discussion on Section I.- II. Phase Separation in Alkali Silicate and Borosilicate Glasses.- Influence of the Oxides of Lithium, Potassium, and Cesium on Phase Separation in Sodium Silicate Glasses.- Relation between the Microheterogeneity of Lithium Silicate Glasses and the Rate of Their Dissolution in Hydrofluoric Acid.- Study of Phase-Separation Processes in the Sodium Silicate Instem by the Electromotive Force Method.- Influence of Heat Treatment on Viscosity of Sodium Silicate and Sodium Borosilicate Glasses.- Regions of Metastable Phase Separation in Ternary Alkali Borosilicate Systems.- Composition of Coexisting Phases in Sodium Borosilicate Glasses Exhibiting Phase Separation.- Influence of Composition on Viscosity and Transformation Temperatures of Borosilicate Glasses Exhibiting Phase Separation.- Porous Glasses as a Source of Information on Structural Changes in Sodium Borosilicate Glasses Undergoing Phase Separation.- Investigation of Phase Separation in Glasses of the Instem R2O-B2O3-SiO2 by Study of Their Electrical Properties.- Influence of Replacement of Silica by Various Glass-Forming Oxides on the Tendency to Phase Separation in the System R2O-B2O3-SiO2.- Phase Separation in Low-Alkali Borosilicate Glasses Containing RO and Al2O3.- Properties of Glasses Exhibiting Phase Separation in the System SiO2-B2O3-Al2O3-ZnO-Na2O.- Influence of Lead Oxide on the Structure and Properties of Borosilicate Glass.- Influence of the Composition and Ratio of the Separated Phases on Stresses Arising During Leaching of Two-Phase Sodium Borosilicate Glasses.- Structural Physical State of Microheterogeneous Glasses.- Use of Differential Thermal Analysis and Dilatometric Measurements for Study of Phase-Separation Phenomena in Glasses.- Discussion on Section II.- III. Phase Separation in Other Multicomponent Glasses.- EPR Study of Structural Changes During Microphase Separation in Titanium-Containing Glasses.- Investigation of Phase-Separation Processes in Titanium-Containing Glasses in the System SiO2-Al2O3-CaO-MgO.- Influence of Titanium Dioxide on Phase Separation in Lithium Aluminosilicate Glasses.- Phase-Separation Phenomena in Glasses of Aluminosilicate Systems Containing Various Modifier Cations.- Microphase Separation in Glass Containing Certain Crystallization Initiators.- Influence of Phase Separation on Physical and Chemical Properties of Heat-Treated Fibers.- Photochromism and Microphase Separation of Glass.- Droplet Separation in Photosensitive Glass.- Spectroscopic Investigation of Glasses in the System R2O-La2O3-SiO2.- Use of the Spectral Luminescence Method for Studying Phase Separation in Silicate Glasses.- Influence of Microphase Separation in Fluoberyllate Glasses on the Concentration Dependence of Certain Properties.- Phase-Separation Phenomena in Glasses of the System La2 O3-B2O3-P2O5.- Differentiation of Structural Groups in Slag Glasses.- Phase-Separation Phenomena During Thermal Aging of Multicomponent Thermometer Glasses and Their Influence on Physical Properties.- Influence of Phase Separation on Certain Properties of Glasses in the System SiO2-Al2O3-B2O3-Bi2O3-CeO2-ZrO2.- General Discussion.