Browsing Physics by Title

Now showing items 112-131 of 807

Damage formation and optical absorption in neutron irradiated SiC

Wendler, E.; Bierschenk, Th.; Felgentrager, F.; Sommerfeld, J.; Wesch, W.; Alber, D.; Bukalis, G.; Prinsloo, Linda Charlotta; Van der Berg, Nic (Nicolaas George); Friedland, Erich Karl Helmuth; Malherbe, Johan B. (Elsevier, 2012-09)

The defect formation in neutron irradiated SiC was investigated by means of Rutherford backscattering spectrometry in channelling mode (RBS), optical absorption and Raman spectroscopy. The relative defect concentration ...
Damage formation in Ge during Ar+ and He+ implantation at 15 K

Hayes, M.; Schroeter, A.; Wendler, E.; Wesch, W.; Auret, Francois Danie; Nel, Jacqueline Margot (Elsevier, 2009)

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dc-Hydrogen plasma induced defects in bulk n-Ge

Nyamhere, Cloud; Venter, Andre; Murape, D.M.; Auret, Francois Danie; Coelho, Sergio M.M.; Botha, J.R. (Elsevier, 2012-08)

Bulk antimony doped germanium (n-Ge) has been exposed to a dc-hydrogen plasma. Capacitance-voltage depth profiles revealed extensive near surface passivation of the shallow donors as evidenced by ˜ a 1.5 orders of magnitude ...
Deciphering the structural, textural, and electrochemical properties of activated BN-doped spherical carbons

Mutuma, B.K. (Bridget); Boitumelo J. Matsoso; Momodu, Damilola Y.; Oyedotun, Kabir Oyeniran; Coville, Neil J.; Manyala, Ncholu I. (MDPI Publishing, 2019-03-16)

In this study, the effect of K2CO3 activation on the structural, textural, and electrochemical properties of carbon spheres (CSs) and boron and nitrogen co-doped carbon spheres (BN-CSs) was evaluated. Activation of the ...
Deconvolution models for determining the real surface composition of InP (1 0 0) after bombardment with 5 keV Ar ions at different angles

Odendaal, R.Q. (Quintin); Malherbe, Johan B. (Elsevier, 2019-12)

Low energy ion bombardment can induce compositional changes in the surfaces of compound materials. A fundamental problem is to determine which of the two main mechanisms caused the compositional change, viz. preferential ...
Deep level transient spectroscopy (DLTS) study of defects introduced in antimony doped Ge by 2 MeV proton irradiation

Nyamhere, Cloud; Das, A.G.M.; Auret, Francois Danie; Chawanda, Albert; Pineda-Vargas, C.A.; Venter, Andre (Elsevier, 2011-08)

Please read the abstract in the article.
A deep MeerKAT search for neutral hydrogen in, and lensed by, dense environments

Ranchod, Shilpa (University of Pretoria, 2020-12)

Neutral hydrogen (HI) is a key ingredient in galaxy formation and an excellent tracer of galaxy evolution and the environmental drivers thereof. HI volume density varies significantly with environment, where denser ...
Defect charge states in Si doped hexagonal boron-nitride monolayer

Mapasha, Refilwe Edwin; Molepo, Mahlanga P.; Andrew, Richard Charles; Chetty, Nithaya (IOP Publishing, 2016-02)

We perform ab initio density functional theory calculations to investigate the energetics, electronic and magnetic properties of isolated stoichiometric and non-stoichiometric substitutional Si complexes in a hexagonal ...
Defect levels induced by double substitution of B and N in 4H-SiC

Igumbor, Emmanuel; Danga, Helga Tariro; Omotoso, Ezekiel; Meyer, Walter Ernst (Elsevier, 2019-03)

Please read abstract in the article.
Defect production in strained p-type Si1-xGex by Er implantation

Mamor, M.; Pipeleers, B.; Auret, Francois Danie; Vantomme, M. (American Institute of Physics, 2011-01)

Strained p-Si1−xGex (x = 5.3%, 10.2%, and 15.4%) was irradiated at room temperature with 160 keV 166Er2+ ions to a fluence of 1×1010 or 3×1013 Er/cm2. The defects induced by ion implantation were investigated experimentally ...
Defect states of complexes involving a vacancy on the boron site in boronitrene

Ngwenya, T. Bongani; Ukpong, Aniekan M.; Chetty, Nithaya (American Physical Society, 2011-12)

First principles calculations have been performed to investigate the ground state properties of freestanding monolayer hexagonal boronitrene (h-BN). We have considered monolayers that contain native point defects and ...
Defects in swift heavy ion irradiated n-4H-SiC

Tunhuma, Shandirai Malven; Diale, M. (Mmantsae Moche); Nel, Jacqueline Margot; Madito, M.J. (Moshawe); Hlatshwayo, Thulani Thokozani; Auret, Francois Danie (Elsevier, 2019-12)

Please read abstract in the article.
Defects induced by solid state reactions at the tungsten-silicon carbide interface

Tunhuma, Shandirai Malven; Diale, M. (Mmantsae Moche); Legodi, Matshisa Johannes; Nel, Jacqueline Margot; Thabethe, Thabsile Theodora; Auret, Francois Danie (American Institute of Physics Inc., 2018-01-18)

Defects introduced by the solid state reactions between tungsten and silicon carbide have been studied using deep level transient spectroscopy (DLTS) and Laplace DLTS. W/4H-SiC Schottky barrier diodes were isochronally ...
Density functional studies of the defect-induced electronic structure modifications in bilayer boronitrene

Ukpong, Aniekan M.; Chetty, Nithaya (IOP Publishing, 2012-05)

The van der Waals interaction-corrected density functional theory is used in this study to investigate the formation, energetic stability, and inter-layer cohesion in bilayer hexagonal boronitrene. The effect of inter-layer ...
Density functional theory calculation of monolayer WTe2 transition metal dichalcogenides doped with H, Li and Be

Igumbor, Emmanuel; Mapasha, Refilwe Edwin; Meyer, Walter Ernst (Elsevier, 2018-04)

Please read abstract in the article.
Density functional theory study of Cu doped {0001} and {0112} surfaces of hematite for water splitting

Simfukwe, Joseph; Mapasha, Refilwe Edwin; Artur Braun; Diale, M. (Mmantsae Moche) (Cambridge University Press, 2018-02)

Density Functional Theory (DFT) calculations study of Cu doped {0001} and {01-12} surfaces of hematite for enhanced water splitting have been carried out. The doping was restricted to planes in the vicinity of the surface, ...
Departement Fisika

University of Pretoria. Dept. of Physics (University of Pretoria, Department of Physics, 2009)

Album portraying the History of the Department of Physics, University of Pretoria, 1950-2000.
The dependence of barrier height on temperature for Pd Schottky contacts on ZnO

Mtangi, Wilbert; Auret, Francois Danie; Nyamhere, Cloud; Janse van Rensburg, Pieter Johan; Chawanda, Albert; Diale, M. (Mmantsae Moche); Nel, Jacqueline Margot; Meyer, Walter Ernst (Elsevier, 2009)

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Design and characterization of asymmetric supercapacitor useful in hybrid energy storage systems for electric vehicles

Barzegar, Farshad; Momodu, Damilola Y.; Zhang, Lijun; Xia, Xiaohua; Manyala, Ncholu I. (Elsevier, 2017-12)

Energy storage systems (ESSs) of electric vehicles (EVs) require high energy density and high power density concurrently. The ESSs with only supercapacitors (SCs) or high performance batteries (hpBs) have egregious ...
Design and fabrication of a chemical vapour deposition system with special reference to ZrC layer growth characteristics

Biira, Saphina; Crouse, Philippus L.; Bissett, H.; Hlatshwayo, Thulani Thokozani; Van Laar, Jean H.; Malherbe, Johan B. (Southern African Institute of Mining and Metallurgy, 2017-10)

The overall aim of this research project was to design and construct an inhouse, thermal chemical vapour deposition (CVD) reactor system, operating at atmospheric pressure. Radio frequency (RF) induction heating was ...

Now showing items 112-131 of 807

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