Sökning: "SINGLE-CRYSTALS"

Visar resultat 36 - 40 av 70 avhandlingar innehållade ordet SINGLE-CRYSTALS.

1. 36. The Challenge of Probing Lithium Insertion Mechanisms in Cathode Materials

   Författare :Jonas Höwing; Torbjörn Gustafsson; Christian Masquelier; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; Li-ion battery; cathode materials; insertion mechanism; single-crystal X-ray diffraction; vanadium oxide; lithium iron phosphate; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : The Li-ion battery has, from its commercialisation in the early 1990's, now become the most widely used power source for portable low-power electronics: laptops, cellular phones and MP3-players are a few examples. To further develop existing and find new electrode materials for these batteries, it is vital to understand the lithium insertion/extraction mechanisms taking place during battery operation. LÄS MER

3. 37. Case Studies in Ion Beam Assisted Nanostructure Engineering

   Författare :Rajdeep Kaur; Petter Ström; Daniel Primetzhofer; Tuan Tran; Naureen Ghafoor; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ion irradiation; material modification; nanostructures; calcium fluoride; polyimide; etching; Fysik; Physics;

   Sammanfattning : Beams of energetic ions can be used for material analysis and modification. It provides us with a tool featuring unique control over the area, depth and amount of damage in the material. This property of ion beams can be used to generate desired changes in material properties or form nanostructures with specific characteristics in the material. LÄS MER

4. 38. Fundamental Properties of Functional Magnetic Materials

   Författare :Magnus Wikberg; Peter Svedlindh; Per Nordblad; Klas Gunnarsson; Amílcar Labarta; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Magnetic anisotropy; magnetic aging; magnetic semiconductors; exchange interactions; magnetic oxides; spin glasses; lithium-ion batteries; short-range magnetic order; Physics; Fysik; Engineering Science with specialization in Solid State Physics; Teknisk fysik med inriktning mot fasta tillståndets fysik;

   Sammanfattning : Magnetic properties of powders, thin films and single crystals have been investigated using magnetometry methods. This thesis provides analysis and conclusions that are supported by the results obtained from spectroscopic and diffraction measurements as well as from theoretical calculations. LÄS MER

5. 39. Superradiant THz wave emission from arrays of Josephson junctions

   Författare :Ievgenii Borodianskyi; Vladimir Krasnov; Yury Shukrinov; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Josephson junction; Superconductor; ThZ emission; high-Tc; Physics; fysik;

   Sammanfattning : High-power, continuous-wave, compact and tunable THz sources are needed for a large variety of applications. Development of power-efficient sources of electromagnetic radiation in the 0.1-10 THz range is a difficult technological problem, known as the “THz gap. LÄS MER

7. 40. Preparation, structure and properties of Hg, Tl-containing high-temperature superconductors

   Författare :Martin Valldor; Stephen Berger; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; oorganisk kemi; Inorganic Chemistry;

   Sammanfattning : Powder samples with the general composition (Tl,Hg)2(Ba,Sr)2(Sr,Ca)Cu2O8-d, abbreviated 2212, were synthesised by solid-state reaction of metal oxides in closed silica ampoules. Depending on the relative amounts of Ba, Sr, and Ca, the superconducting transition temperature, Tc, varied significantly (45-100 K). LÄS MER