Sökning: "lanthanum"
Visar resultat 16 - 20 av 37 avhandlingar innehållade ordet lanthanum.
16. Structure of Rare-Earth Aluminosilicate Glasses Probed by Solid-State NMR Spectroscopy and Quantum Chemical Calculations
Sammanfattning : Aluminosilicate glasses incorporating rare earth elements feature highly beneficial physical and chemical properties, at the level beyond that accessible for compositions based on alkali and/or alkaline earth metals. Extraordinary hardness, high glass transition temperatures and indices of refraction, favorable coefficients of thermal expansion, as well as excellent chemical durability, result in many potential technological applications. LÄS MER
17. In situ measurements of radionuclide concentration in soil : An investigation into detector properties and methods
Sammanfattning : In case of a release of radioactive nuclides into the environment it is necessary to have reliable methods to estimate the potential effect on people and the ecosystem. In this context the total activity deposited, the elemental composition and the depth distribution are of importance. LÄS MER
18. Leaching and solvent extraction of rare earth metals from fluorescent lamp waste
Sammanfattning : With the rapid advancement of technology, the demand for elements such as rare earth metals (REMs) has increased considerably during the last decade. Many countries are facing problems securing sustainable supplies, a fact acknowledged in many publications. LÄS MER
19. Structure of solvated matal ions
Sammanfattning : The structure of the solvated group 3 ions scandium(III),yttrium(III) and lanthanum(III), has been determined in aqueoussolution and in some oxygen donor solvents, and compared withthe hydrated group 13 ions gallium(III) and indium(III). Acombination of X-ray absorption fine structure (XAFS), largeangle X-ray scattering (LAXS), crystallography and vibrationspectroscopy has been used for the structure studies of thehydrated ions and their dimethylsulfoxide andN,N´-dimethylpropylene urea solvates in solution and inthe solid state. LÄS MER
20. Coated Ferritic Stainless Steels as Interconnects in Solid Oxide Fuel Cells
Sammanfattning : Solid oxide fuel cells (SOFCs) have gained increased research interest as they arepromising devices for a decentralized and clean electricity and heat production. Severalmaterial challenges have to be solved to reach sufficient efficiencies and life times. LÄS MER
