Search for dissertations about: "vacancies crystal"

Showing result 1 - 5 of 38 swedish dissertations containing the words vacancies crystal.

2. 1. Structure and properties of FeAl as influenced by processing

   Author : HELENA SKOGLUND; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; EDS; mechanical alloying; FeAl; Al2O3 precipitates; boron-doping; powder processing; diffusion; vacancies; mechanical properties; hardening mechanisms;

   Abstract : Iron aluminides are candidate materials for a sustainable society since they are composed of abundant metals and have excellent corrosion properties in combination with high specific strength. However, there are some drawbacks that limit the practical use, e.g. low RT ductility and a drop in strength at high temperature. READ MORE

4. 2. Ordering of atoms and vacancies in cubic gamma brasses

   Author : Lars Arnberg; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : The article reviews crystal structure investigations of some binary cubic gamma brasses. The normal l-centered and primitive gamma brass structures as well as 2 x 2 x 2 cubic superstructures with both F- and l-centered unit cells are described. READ MORE

5. 3. Toughness Enhancement in Hard Single-Crystal Transition-Metal Nitrides : V-Mo-N and V-W-N Alloys

   Author : Hanna Kindlund; Lars Hultman; Jens Birch; Daniel Gall; Linköpings universitet; []
   Keywords : ;

   Abstract : Transition-metal nitrides are known for their high hardness, good wear resistance, high-temperature stability, and chemical inertness. Because of these properties, they are extensively used in many industrial applications, notably as protective wear, erosion, and scratch resistant coatings, which are often subjected to high thermo-mechanical stresses. READ MORE

6. 4. Improving Thermoelectric Properties of Inorganic Clathrates by Atomic and Microscale Structure Engineering

   Author : Yifei Zhang; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Crystal structure; Thermoelectrics; Chemical ordering; Microstructure; Clathrates; Thermal properties; Electrical transport properties;

   Abstract : As more countries are aiming for a carbon-neutral economy, technologies that utilize renewable energies are increasingly being considered. Thermoelectric materials enable the direct conversion between a thermal gradient and an electrical potential gradient, and are thus exploited for applications such as waste heat recovery. READ MORE

7. 5. Beyond average crystal structures: understanding extended and local environments in proton-conducting Sc-substituted BaTiO3 perovskites

   Author : Nico Torino; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; proton conducting oxide; IR; thermogravimetry; perovskite; neutron scattering; Raman; Reverse Monte Carlo; ordering; BaTiO3;

   Abstract : Proton conducting ceramics are very promising for applications concerned with energy sourcing with cleaner, safer, more abundant and cheaper alternatives to fossil fuels. These materials are still in development and advances in the field depend on a better understanding of the role of defects, their identification and location in the host framework, and the assessment of their short- and long-range dynamics and kinetics. READ MORE