Search for dissertations about: "Ulrich Häussermann"

Showing result 1 - 5 of 8 swedish dissertations containing the words Ulrich Häussermann.

2. 1. Pressure-Induced Amorphization and Distinct Amorphous States of Clathrate Hydrates

   Author : Paulo H. B. Brant Carvalho; Ulrich Häussermann; Ove Andersson; John Stephen Loveday; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Clathrate Hydrates; Pressure-Induced Amorphization; Amorphous States; Glassy States; Ice; Neutron Diffraction; Klatrathydrater; Tryckinducerad Amorfisering; Amorfa tillstånd; Glasartade tillstånd; Is; Neutrondiffraktion; Physical Chemistry; fysikalisk kemi;

   Abstract : This thesis summarizes a study on the pressure-induced amorphization (PIA) and structures of amorphous states of clathrate hydrates (CHs).PIA involves the transition of a crystalline material into an amorphous solid in response of mechanical compression at temperatures well below the melting point. READ MORE

4. 2. Hunting Hydrogen : Structure-property relations in High Entropy Alloy-based metal hydrides

   Author : Gustav Ek; Martin Sahlberg; Ulrich Häussermann; William I.F. David; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hydrogen; metal-hydride; High Entropy Alloy; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Abstract : Metal hydrides have many uses when switching the energy system from fossil fuels to renewable sources, such as rechargeable batteries, hydrogen storage, hydrogen compression and thermal storage. State of the art materials for these applications such as LaNi5 and TiFe, however, suffer certain limitations such as degradation during repeated hydrogen cycling and harsh activation conditions for initial hydrogen uptake, promoting the need for novel materials. READ MORE

5. 3. Structure-property investigation of ZnSb, ZnAs, and SiB3 : - binary semiconductors with electron poor framework structures

   Author : Daniel Eklöf; Ulrich Häussermann; Oliver Orckler; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Thermoelectric; Waste heat harvesting; Semiconductor; X-ray powder diffraction; SEM; Electron poor framework; EPFS; Green house effect; Inorganic Chemistry; oorganisk kemi;

   Abstract : In today’s society, where energy conservation and green energy are buzz words, new scientific discoveries in green energy harvesting is key. This work focuses on materials capable of recycling low value thermal energy. READ MORE

6. 4. Structure and Phase Stability of CaC2 Polymorphs, Li2C2 and Lithium Intercalated Graphite : A Revisit with High Pressure Experiments and Metal Hydride–Graphite Reactions

   Author : Sumit Konar; Ulrich Häussermann; Gunnar Svensson; Arnold Guloy; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; acetylide carbides; high pressure; Raman spectroscopy; powder X-ray diffraction; Rietveld refinement; Materials Chemistry; materialkemi;

   Abstract : Alkali (A) and alkaline earth (AE) metals can form carbides and intercalated graphites with carbon. The carbides mostly represent acetylides which are salt-like compounds composed of C22− dumbbell anions and metal cations. Both the acetylide carbides and intercalated graphites are technologically important. READ MORE

7. 5. Investigating Hydrogenous Behavior of Zintl Phases : Interstitial Hydrides, Polyanionic Hydrides, Complex Hydrides, Oxidative Decomposition

   Author : Verina Kranak; Ulrich Häussermann; Gordon Miller; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Zintl phases; Hydrogenous Zintl phases; Polyanionic Zintl phases; Interstitial Zintl phases; Inorganic Chemistry; oorganisk kemi;

   Abstract : This thesis is an investigation into the hydrogenous behavior of Zintl phases. Zintl phases are comprised of an active metal (i.e alkali, alkaline earth, and rare earth) and a p-block element. The discussion gives an overview of the influence hydrogen affects the electronic and geometric structure of Zintl phases and subsequent properties. READ MORE