Harrison WA (1978) Is silicon dioxide covalent or ionic? In: Pantelides ST (ed) The physics of SiO 2 and its Interfaces. Pergamon, London, p 105Harrison, W.a. (1978) Is silicon dioxide covalent or ionic? In S.T. Pantelides, Ed., The Physics of SiO2 and its Interfaces, p. 105,...
The atomic radius is 1.33 Å, the covalent radius is 1.17 Å, and the ionic radii are 0.39 Å for Si4+ and 1.98 Å for Si4-. Silicon is tetravalent (like carbon) in its compounds. However, in contrast to carbon, silicon exhibits the coordination number of 6 in addition to the ...
29Si (4.67%), and 30Si (3.10%).[47] Out of these, only 29Si is of use in NMR and EPR spectroscopy,[48] as it is the only one with a nuclear spin (I =1/2).[30] All three are produced in Type Ia supernovae[49][50] through the oxygen-burning process, with 28Si being m...
The self-consistent tight-binding (SCTB) model proposed by Majewski and Vogl (1987) has been extended to be applicable for calculations of lattice defects in solids or disordered systems with both ionic and covalent characters that canno... M Kohyama,S Kose,M Kinoshita,... - 《Journal of...
Improving the dispersion of active sites simultaneous with the efficient harvest of photons is a key priority for photocatalysis. Crystalline silicon is abundant on Earth and has a suitable bandgap. However, silicon-based photocatalysts combined with met
in these legacy materials is near one and the chemical bonding in these alloys is primarily covalent. Considerable effort during the last two decades has gone into reducing thermal conductivity by various approaches. “Intrinsic” factors such as phonon–phonon and electron–phonon scattering are ...
In soda-lime glasses, the chemical bond to oxygen (O) in the case of Si-O is covalent in nature, and quite strong. The ionic bonds Na-O or K-O are weaker in comparison. When glass comes into contact with water or acidic or basic solutions, as in the case of foodstuffs and beverag...
The quality of the models is noteworthy given that our study constitutes a feasibility evaluation of the capability of the MEAM formalism to represent a system which contains the characteristics of both covalent and ionic bonding.doi:10.1088/0965-0393/13/8/008Kuo, Chin-Lung...
where M stands for transition metal, can be modified depending on the C-M bond strength and the ratio of C/M atomic radii59. In this case the atoms are attracted by the mixture of covalent, ionic and metal bonds. Depending on the deposition conditions and actual composition various nanocompo...
Cells were assembled in an argon-filled glovebox with both the moisture and the oxygen content below 0.1 ppm and then tested at 298 K. The galvanostatic charging/discharging tests of the samples were conducted on a Land battery test system (CT2001A) with the voltage range of 0.01–3 V. ...