Ternary phosphate glasses doped with transition metal oxides for optoelectronic applications
Provider: Grantová agentura ČR
Programme: Standardní projekty (řešení od 1.1 2010)
Implementation period: 01.01.10 - 31.12.12
Workplace:
Fakulta chemicko-technologická - Katedra obecné a anorganické chemie
Investigator: Koudelka LadislavTeam member: Mošner Petr | Černošek Zdeněk | Holubová Jana | Vlček Miroslav | Beneš Ludvík
Description:
The aim of the project is the investigation of new phosphate glasses doped with transition metal oxides, possessing a good chemical durability and thermal stability. Attention will be devoted especially to ternary phosphate glasses with divalent oxides (PbO, ZnO) modified with molybdenum oxide MoO3 and tungsten oxide WO3. The aim of the project is to study several ternary systems ZnO-P2O5-MoO3, ZnO-P2O5-WO3, PbO-P2O5-MoO3 and PbO-P2O5-WO3, because a complete information on the glass-forming ability is lacking yet and these glasses should reveal higher chemical durability than those with alkali oxides. Investigation of these glasses will start with the determination of glass-forming regions in the mentioned ternary systems followed by the investigation of the effect of composition on the chemical durability, thermal stability and crystallization processes in these glasses. Investigation of the structure of these glasses by spectroscopic methods (Raman, IR and NMR spectroscopy) is also an important part of the project, because the knowledge of relations between composition of the studied glasses and their structure and physico-chemical properties can be used for the optimalization of glass compositions for their applications. As both transition metals (Mo, W) reveal a tendency to form lower-valence states, a part of studies will be devoted also to the investigation of redox processes in these glasses by the technique of electron resonance spectroscopy and measurements of optical transmittance.
The aim of the project is the investigation of new phosphate glasses doped with transition metal oxides, possessing a good chemical durability and thermal stability. Attention will be devoted especially to ternary phosphate glasses with divalent oxides (PbO, ZnO) modified with molybdenum oxide MoO3 and tungsten oxide WO3. The aim of the project is to study several ternary systems ZnO-P2O5-MoO3, ZnO-P2O5-WO3, PbO-P2O5-MoO3 and PbO-P2O5-WO3, because a complete information on the glass-forming ability is lacking yet and these glasses should reveal higher chemical durability than those with alkali oxides. Investigation of these glasses will start with the determination of glass-forming regions in the mentioned ternary systems followed by the investigation of the effect of composition on the chemical durability, thermal stability and crystallization processes in these glasses. Investigation of the structure of these glasses by spectroscopic methods (Raman, IR and NMR spectroscopy) is also an important part of the project, because the knowledge of relations between composition of the studied glasses and their structure and physico-chemical properties can be used for the optimalization of glass compositions for their applications. As both transition metals (Mo, W) reveal a tendency to form lower-valence states, a part of studies will be devoted also to the investigation of redox processes in these glasses by the technique of electron resonance spectroscopy and measurements of optical transmittance.
