Browsing NTNU Open by Author "Sahini, Mtabazi Geofrey"
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Aspects related to the thermal and mechanical stability of oxygen permeable membranes
Sahini, Mtabazi Geofrey (Doctoral theses at NTNU;2017:59, Doctoral thesis, 2017)Fossil fuels causes CO2 emission to the atmosphere after combustion, and to minimize CO2 emission carbon capture and sequestration (CCS) technologies are under development. CCS involves CO2 capture, compression, transport ... -
High temperature X-ray diffraction and thermo-gravimetrical analysis of the cubic perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-δ under different atmospheres
Sahini, Mtabazi Geofrey; Tolchard, Julian R; Wiik, Kjell; Grande, Tor (Journal article; Peer reviewed, 2015)Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) with the cubic perovskite structure is known to be metastable at low temperature under an oxidizing atmosphere. Here, the thermal and chemical expansion of BSCF were studied by in situ high ... -
Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ and in situ stress dependent synchrotron X-ray diffraction study
Geiger, Philipp T.; Clemens, Oliver; Khansur, Neamul H.; Hinterstein, Manuel; Sahini, Mtabazi Geofrey; Grande, Tor; Tung, Patrick; Daniels, John E.; Webber, Kyle G. (Journal article; Peer reviewed, 2017)Perovskite type Ba0.5Sr0.5Co0.8Fe0.2O3 − δ ceramics display nonlinear stress-strain behaviour upon uniaxial compression at room temperature. Step functional loading experiments show that the nonlinear strain response of ... -
Surface Diffusion of Oxygen Transport Membrane Materials Studied by Grain-Boundary Grooving
Sahini, Mtabazi Geofrey; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2016)Mass transport mechanism responsible for grain-boundary grooving during thermal annealing of polished ceramics of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and La2NiO4+δ (LN) was revealed by atomic force microscopy. Surface diffusion ...