Essays about: "X-ray diffraction"

Showing result 21 - 25 of 191 essays containing the words X-ray diffraction.

1. 21. Development of alkaline earth metal-based, metal-organic frameworks for greenhouse gas sorption

   University essay from Uppsala universitet/Institutionen för materialvetenskap

   Author : Ali Maghsoodpoor; [2022]
   Keywords : Metal-organic Framework; gas sorption;

   Abstract : Metal-organic frameworks (MOFs) constructed from metal atoms connected by organic linkers have received extensive attention for greenhouse gas separation in the past decades. Moreover, their large surface area makes them a promising candidate as adsorbents for gas sorption. READ MORE

3. 22. Nanoscale characterisation of model Ni-Mo catalyst active phases

   University essay from Lunds universitet/Centrum för analys och syntes

   Author : Jonas Elmroth Nordlander; [2022]
   Keywords : Ni-Mo catalysts; Hydrodeoxygenation; TEM; PXRD; Materials chemistry; Chemistry;

   Abstract : An important stepping stone in transitioning from a fossil-fuel based transportation system is the production of bio-fuels such as bio-oils. For bio-oils to be commercially viable, catalytic upgrading via hydrodeoxygenation is required, typically using Ni-Mo oxide or sulfide catalysts. READ MORE

4. 23. Time-resolved x-ray diffraction study of longitudinal optical phonons in zincblende semiconductors

   University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Author : Lassi Linnala; [2022]
   Keywords : femtosecond THz radiation; ultrafast x-ray diffraction; pump-probe; longitudinal optical phonons; zincblende semiconductors; anharmonic decay; density functional perturbation theory; Physics and Astronomy;

   Abstract : Anharmonic decay of longitudinal optical (LO) phonons in zincblende semiconductors is not at present well characterized due to the polar and many-body nature of the problem. Femtosecond THz radiation offers a novel route to this study, as the interaction of this radiation is directly with the phonon lattice and these THz excited phonons do not have enough energy to excite electrons over the band gap. READ MORE

5. 24. Sputtered Transparent Contact Layers for Bifacial and Tandem Solar Cells

   University essay from Uppsala universitet/Solcellsteknik

   Author : Klara Kiselman; [2022]
   Keywords : Solar cells; ITO; indium doped tin oxide; bifacial cell; tandem cell; transparent conductive oxides;

   Abstract : A key to solar cells with lower environmental impact is higher efficiency and reduced material usages. Bifacial solar cells may have a higher efficiency as light can enter from two directions and tandem solar cells may use a larger part of the incoming solar spectrum, increasing the efficiency. READ MORE

6. 25. A study of optical and structural properties of spin-coated V2O3 thin films on sapphire substrates

   University essay from Linköpings universitet/Institutionen för fysik, kemi och biologi

   Author : Jennifer Silander; [2022]
   Keywords : Optical properties; transmittance; FTIR spectrometry; scanning electron microscopy; x-ray diffraction; metal-insulator transition; crystalline material; sol-gel; spin-coating; vanadium oxide; infrared light;

   Abstract : Many transition metal oxides exhibit a Metal-Insulator Transition (MIT). This is an interesting phenomenon where the material undergoes a structural phase transition, and the electronic charge is redistributed in the crystal lattice. READ MORE