SRM University

About: SRM University is a education organization based out in Chennai, India. It is known for research contribution in the topics: Computer science & Population. The organization has 10787 authors who have published 11704 publications receiving 103767 citations. The organization is also known as: Sri Ramaswamy Memorial University.

CO Oxidation Prefers the Eley-Rideal or Langmuir-Hinshelwood Pathway: Monolayer vs Thin Film of SiC.

Abstract: Using the first-principles approach, we investigated the electronic and chemical properties of wurtzite silicon carbide (2H-SiC) monolayer and thin film structures and substantiated their catalytic activity toward CO oxidation. 2H-SiC monolayer, being planar, is quite stable and has moderate binding with O2, while CO interacts physically; thus, the Eley–Rideal (ER) mechanism prevails over the Langmuir–Hinshelwood (LH) mechanism with an easily cleared activation barrier. Contrarily, 2H-SiC thin film, which exhibits a nonplanar structure, allows moderate binding of both CO and O2 on its surface, thus favoring the LH mechanism over the ER one. Comprehending these results leads to a better understanding of the reaction mechanisms involving structural contrast. Weak overlapping between the 2pz(C) and 3pz(Si) orbitals of the SiC monolayer system has been found to be the primary reason to revert the active site toward sp3 hybridization, during interaction with the molecules. In addition, the influences of graphi...

Room temperature ferromagnetism in Cr doped SrSnO3 perovskite system

Abstract: Polycrystalline SrSnO3 compounds doped with 1, 3 and 5% of Cr was synthesized by simple chemical precipitation method and the effect of doping on structural, optical and magnetic properties was investigated. Powder X-ray diffraction analysis reveals the orthorhombic structure of pure and Cr doped SrSnO3 compounds. The appearance of metal oxide vibrations were investigated by Fourier transform infra red spectroscopy analysis. Presence of active Raman modes, Sr–O and Sn–O band vibrations were examined by Raman spectral analysis. The high degree of agglomeration in pure SrSnO3 sample and formation of rod like shape of particulate system in all the Cr doped samples was identified by Electron microscopy techniques. X-ray photoelectron spectroscopy analysis discloses the oxidation states of elements and presence of oxygen vacancy in the compounds. The intriguing violet–blue emission behavior of pure and Cr doped compounds due to interaction between O 2p state and Sn 5s energy levels was observed by photoluminescence spectral studies. The magnetization studies exhibit the diamagnetic property of pure SrSnO3 compound and doping of Cr3+ in Sr–Sn–O lattice drives the carrier induced exchange interactions which results ferromagnetic phase transition in all the Cr doped compounds. From the present investigation, tunability of dia to ferromagnetism with respect to the dopant concentration (Cr3+) in SrSnO3 system at room temperature leads the material for fabrication of magneto-optical and electronic devices.