Sökning: "Glass-forming region"

Hittade 4 avhandlingar innehållade orden Glass-forming region.

  1. 1. Preparation, characterization and properties of nitrogen rich glasses in alkaline earth-Si-O-N systems

    Detta är en avhandling från Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi

    Författare :Ali Sharafat; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Oxynitride glasses; glass forming region; nitrogen content; hardness; refractive index; NATURAL SCIENCES Chemistry Inorganic chemistry; NATURVETENSKAP Kemi Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : Nitrogen rich glasses in the systems Ca-Si-O-N, Sr-Si-O-N and AE-Ca-Si-O-N (AE = Mg, Sr and Ba) have been prepared using a novel glass-synthesis route. The limits of the glass forming regions in the Ca and Sr systems and substitution limits in the AE-Ca-Si-O-N systems have been determined and physical properties of the glasses measured. LÄS MER

  2. 2. Novel Route of Oxynitride Glass Synthesis and Characterisation of Glasses in the Ln-Si-O-N and Ln-Si-Al-O-N Systems

    Detta är en avhandling från Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi

    Författare :Abbas Saeed Hakeem; Stockholms universitet.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : The present work has been primarily focused on the glass forming region in the La-Si-O-N system, and attempts have been made to find glass forming regions by adopting a new synthesis route to produce glasses in oxynitride system. This goal can be attained by adding a network modifier in its metallic form instead of as an oxide. LÄS MER

  3. 3. Computer Simulations of Simple Liquids with Tetrahedral Local Order the Supercooled Liquid, Solids and Phase Transitions

    Detta är en avhandling från Stockholm : Numerical Analysis and Computer Science (NADA) (together with KTH), Stockholm University

    Författare :Måns Elenius; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Simple liquids; glasses; liquid-glass transition; supercooled liquids; tetrahedral liquids; phase transitions; quasicrystals; molecular dynamics; NATURAL SCIENCES Physics Condensed matter physics; NATURVETENSKAP Fysik Kondenserade materiens fysik; NATURAL SCIENCES Physics Condensed matter physics Liquid physics; NATURVETENSKAP Fysik Kondenserade materiens fysik Vätskefysik; Numerical Analysis; numerisk analys;

    Sammanfattning : The understanding of complex condensed matter systems is an area of intense study. In this thesis, some properties of simple liquids with strong preference for tetrahedral local ordering are explored. These liquids are amenable to supercooling, and give complex crystalline structures on eventual crystallisation. LÄS MER

  4. 4. Crystallization of glasses in the system (Zr)-Y-Si-Al-O-(N)

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Peter Vomacka; [1996]
    Nyckelord :Engineering Materials; Materialteknik;

    Sammanfattning : Glass is a group of materials that has been used for structural and functional purposes for many centuries. Nevertheless, interest in the science and technology of glass has expanded significantly in recent years as a result of the need to develop new materials for advanced applications. LÄS MER